Programs & Examples On #Let

In Lisp-like and functional languages, introduces a list of local variables, each (possibly optionally) with its initial value.

Why was the name 'let' chosen for block-scoped variable declarations in JavaScript?

Let uses a more immediate block level limited scope whereas var is function scope or global scope typically.

It seems let was chosen most likely because it is found in so many other languages to define variables, such as BASIC, and many others.

What's the difference between using "let" and "var"?

let vs var. It's all about scope.

var variables are global and can be accessed basically everywhere, while let variables are not global and only exist until a closing parenthesis kills them.

See my example below, and note how the lion (let) variable acts differently in the two console.logs; it becomes out of scope in the 2nd console.log.

var cat = "cat";
let dog = "dog";

var animals = () => {
    var giraffe = "giraffe";
    let lion = "lion";

    console.log(cat);  //will print 'cat'.
    console.log(dog);  //will print 'dog', because dog was declared outside this function (like var cat).

    console.log(giraffe); //will print 'giraffe'.
    console.log(lion); //will print 'lion', as lion is within scope.
}

console.log(giraffe); //will print 'giraffe', as giraffe is a global variable (var).
console.log(lion); //will print UNDEFINED, as lion is a 'let' variable and is now out of scope.

SQL Error: 0, SQLState: 08S01 Communications link failure

I'm answering on specific to this error code(08s01).

usually, MySql close socket connections are some interval of time that is wait_timeout defined on MySQL server-side which by default is 8hours. so if a connection will timeout after this time and the socket will throw an exception which SQLState is "08s01".

1.use connection pool to execute Query, make sure the pool class has a function to make an inspection of the connection members before it goes time_out.

2.give a value of <wait_timeout> greater than the default, but the largest value is 24 days

3.use another parameter in your connection URL, but this method is not recommended, and maybe deprecated.

How to change the scrollbar color using css

You can use the following attributes for webkit, which reach into the shadow DOM:

::-webkit-scrollbar              { /* 1 */ }
::-webkit-scrollbar-button       { /* 2 */ }
::-webkit-scrollbar-track        { /* 3 */ }
::-webkit-scrollbar-track-piece  { /* 4 */ }
::-webkit-scrollbar-thumb        { /* 5 */ }
::-webkit-scrollbar-corner       { /* 6 */ }
::-webkit-resizer                { /* 7 */ }

Here's a working fiddle with a red scrollbar, based on code from this page explaining the issues.

http://jsfiddle.net/hmartiro/Xck2A/1/

Using this and your solution, you can handle all browsers except Firefox, which at this point I think still requires a javascript solution.

Javascript string/integer comparisons

The answer is simple. Just divide string by 1. Examples:

"2" > "10"   - true

but

"2"/1 > "10"/1 - false

Also you can check if string value really is number:

!isNaN("1"/1) - true (number)
!isNaN("1a"/1) - false (string)
!isNaN("01"/1) - true (number)
!isNaN(" 1"/1) - true (number)
!isNaN(" 1abc"/1) - false (string)

But

!isNaN(""/1) - true (but string)

Solution

number !== "" && !isNaN(number/1)

The opposite of Intersect()

I'm not 100% sure what your NonIntersect method is supposed to do (regarding set theory) - is it
B \ A (everything from B that does not occur in A)?
If yes, then you should be able to use the Except operation (B.Except(A)).

Create two-dimensional arrays and access sub-arrays in Ruby

Here is an easy way to create a "2D" array.

2.1.1 :004 > m=Array.new(3,Array.new(3,true))

=> [[true, true, true], [true, true, true], [true, true, true]]

bash export command

Are you certain that the software (and not yourself, since your test actually only shows the shell used as default for your user) uses /bin/bash ?

Angular CLI - Please add a @NgModule annotation when using latest

In my case, I created a new ChildComponent in Parentcomponent whereas both in the same module but Parent is registered in a shared module so I created ChildComponent using CLI which registered Child in the current module but my parent was registered in the shared module.

So register the ChildComponent in Shared Module manually.

How to set null to a GUID property

Since "Guid" is not nullable, use "Guid.Empty" as default value.

Can grep show only words that match search pattern?

I was unsatisfied with awk's hard to remember syntax but I liked the idea of using one utility to do this.

It seems like ack (or ack-grep if you use Ubuntu) can do this easily:

# ack-grep -ho "\bth.*?\b" *

the
the
the
this
thoroughly

If you omit the -h flag you get:

# ack-grep -o "\bth.*?\b" *

some-other-text-file
1:the

some-text-file
1:the
the

yet-another-text-file
1:this
thoroughly

As a bonus, you can use the --output flag to do this for more complex searches with just about the easiest syntax I've found:

# echo "bug: 1, id: 5, time: 12/27/2010" > test-file
# ack-grep -ho "bug: (\d*), id: (\d*), time: (.*)" --output '$1, $2, $3' test-file

1, 5, 12/27/2010

How to 'foreach' a column in a DataTable using C#?

Something like this:

 DataTable dt = new DataTable();

 // For each row, print the values of each column.
    foreach(DataRow row in dt .Rows)
    {
        foreach(DataColumn column in dt .Columns)
        {
            Console.WriteLine(row[column]);
        }
    }

http://msdn.microsoft.com/en-us/library/system.data.datatable.rows.aspx

In python, how do I cast a class object to a dict

It's hard to say without knowing the whole context of the problem, but I would not override __iter__.

I would implement __what_goes_here__ on the class.

as_dict(self:
    d = {...whatever you need...}
    return d

Split string into individual words Java

You can use split(" ") method of the String class and can get each word as code given below:

String s = "I want to walk my dog";
String []strArray=s.split(" ");
for(int i=0; i<strArray.length;i++) {
     System.out.println(strArray[i]);
}

ASP.net vs PHP (What to choose)

There are a couple of topics that might provide you with an answer. You could also run some tests yourself. Doesn't see too hard to get some loops started and adding a timer to calculate the execution time ;-)

Error Handler - Exit Sub vs. End Sub

Your ProcExit label is your place where you release all the resources whether an error happened or not. For instance:

Public Sub SubA()
  On Error Goto ProcError

  Connection.Open
  Open File for Writing
  SomePreciousResource.GrabIt

ProcExit:  
  Connection.Close
  Connection = Nothing
  Close File
  SomePreciousResource.Release

  Exit Sub

ProcError:  
  MsgBox Err.Description  
  Resume ProcExit
End Sub

How can I restart a Java application?

Although this question is old and answered, I've stumbled across a problem with some of the solutions and decided to add my suggestion into the mix.

The problem with some of the solutions is that they build a single command string. This creates issues when some parameters contain spaces, especially java.home.

For example, on windows, the line

final String javaBin = System.getProperty("java.home") + File.separator + "bin" + File.separator + "java";

Might return something like this:C:\Program Files\Java\jre7\bin\java

This string has to be wrapped in quotes or escaped due to the space in Program Files. Not a huge problem, but somewhat annoying and error prone, especially in cross platform applications.

Therefore my solution builds the command as an array of commands:

public static void restart(String[] args) {

        ArrayList<String> commands = new ArrayList<String>(4 + jvmArgs.size() + args.length);
        List<String> jvmArgs = ManagementFactory.getRuntimeMXBean().getInputArguments();

        // Java
        commands.add(System.getProperty("java.home") + File.separator + "bin" + File.separator + "java");

        // Jvm arguments
        for (String jvmArg : jvmArgs) {
            commands.add(jvmArg);
        }

        // Classpath
        commands.add("-cp");
        commands.add(ManagementFactory.getRuntimeMXBean().getClassPath());

        // Class to be executed
        commands.add(BGAgent.class.getName());

        // Command line arguments
        for (String arg : args) {
            commands.add(arg);
        }

        File workingDir = null; // Null working dir means that the child uses the same working directory

        String[] env = null; // Null env means that the child uses the same environment

        String[] commandArray = new String[commands.size()];
        commandArray = commands.toArray(commandArray);

        try {
            Runtime.getRuntime().exec(commandArray, env, workingDir);
            System.exit(0);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

How to get URI from an asset File?

Worked for me Try this code

   uri = Uri.fromFile(new File("//assets/testdemo.txt"));
   String testfilepath = uri.getPath();
    File f = new File(testfilepath);
    if (f.exists() == true) {
    Toast.makeText(getApplicationContext(),"valid :" + testfilepath, 2000).show();
    } else {
   Toast.makeText(getApplicationContext(),"invalid :" + testfilepath, 2000).show();
 }

How to convert an address into a Google Maps Link (NOT MAP)

I just found this and like to share..

  1. search your address at maps.google.com
  2. click on the gear icon at the bottom-right
  3. click "shared or embed map"
  4. click the short url checkbox and paste the result in href..

printf not printing on console

Add c:\gygwin\bin to PATH environment variable either as a system environment variable or in your eclipse project (properties-> run/debug-> edit)

How to center text vertically with a large font-awesome icon?

The simplest way is to set the vertical-align css property to middle

i.fa {
    vertical-align: middle;
}

How Best to Compare Two Collections in Java and Act on Them?

I'd move to lists and solve it this way:

  1. Sort both lists by id ascending using custom Comparator if objects in lists aren't Comparable
  2. Iterate over elements in both lists like in merge phase in merge sort algorithm, but instead of merging lists, you check your logic.

The code would be more or less like this:

/* Main method */
private void execute(Collection<Foo> oldSet, Collection<Foo> newSet) {
  List<Foo> oldList = asSortedList(oldSet);
  List<Foo> newList = asSortedList(newSet);

  int oldIndex = 0;
  int newIndex = 0;
  // Iterate over both collections but not always in the same pace
  while( oldIndex < oldList.size() 
      && newIndex < newIndex.size())  {
    Foo oldObject = oldList.get(oldIndex);
    Foo newObject = newList.get(newIndex);

    // Your logic here
    if(oldObject.getId() < newObject.getId()) {
      doRemove(oldObject);
      oldIndex++;
    } else if( oldObject.getId() > newObject.getId() ) {
      doAdd(newObject);
      newIndex++;
    } else if( oldObject.getId() == newObject.getId() 
            && isModified(oldObject, newObject) ) {
      doUpdate(oldObject, newObject);
      oldIndex++;
      newIndex++;
    } else {
      ... 
    }
  }// while

  // Check if there are any objects left in *oldList* or *newList*

  for(; oldIndex < oldList.size(); oldIndex++ ) {
    doRemove( oldList.get(oldIndex) );  
  }// for( oldIndex )

  for(; newIndex < newList.size(); newIndex++ ) {
    doAdd( newList.get(newIndex) );
  }// for( newIndex ) 
}// execute( oldSet, newSet )

/** Create sorted list from collection 
    If you actually perform any actions on input collections than you should 
    always return new instance of list to keep algorithm simple.
*/
private List<Foo> asSortedList(Collection<Foo> data) {
  List<Foo> resultList;
  if(data instanceof List) {
     resultList = (List<Foo>)data;
  } else {
     resultList = new ArrayList<Foo>(data);
  }
  Collections.sort(resultList)
  return resultList;
}

How to make the division of 2 ints produce a float instead of another int?

Try this:

class CalcV 
{
      float v;
      float calcV(int s, int t)
      {
          float value1=s;
          float value2=t;
          v = value1 / value2;
          return v;
      } //end calcV
}

XML Parsing - Read a Simple XML File and Retrieve Values

class Program
{

    static void Main(string[] args)
    {

        //Load XML from local
        string sourceFileName="";
        string element=string.Empty;
        var FolderPath=@"D:\Test\RenameFileWithXmlAttribute";

            string[] files = Directory.GetFiles(FolderPath, "*.xml");
            foreach (string xmlfile in files)
            {
                try
                {
                    sourceFileName = xmlfile;
                    XElement xele = XElement.Load(sourceFileName);
                    string convertToString = xele.ToString();
                    XElement parseXML = XElement.Parse(convertToString);
                    element = parseXML.Descendants("Meta").Where(x => (string)x.Attribute("name") == "XMLTAG").Last().Value;
                    DirectoryInfo CurrentDate = Directory.CreateDirectory(DateTime.Now.ToString("yyyy-MM-dd"));
                    string saveWithThisName= Path.Combine(CurrentDate.FullName, element);
                    File.Copy(sourceFileName, saveWithThisName,true);                      
                }
                catch(Exception ex)
                {

                }      
            }       
    }
}

What is the difference between an int and a long in C++?

The C++ specification itself (old version but good enough for this) leaves this open.

There are four signed integer types: 'signed char', 'short int', 'int', and 'long int'. In this list, each type provides at least as much storage as those preceding it in the list. Plain ints have the natural size suggested by the architecture of the execution environment* ;

[Footnote: that is, large enough to contain any value in the range of INT_MIN and INT_MAX, as defined in the header <climits>. --- end foonote]

JSTL if tag for equal strings

Try:

<c:if test = "${ansokanInfo.PSystem == 'NAT'}">

JSP/Servlet 2.4 (I think that's the version number) doesn't support method calls in EL and only support properties. The latest servlet containers do support method calls (ie Tomcat 7).

Android Percentage Layout Height

You could add another empty layout below that one and set them both to have the same layout weight. They should get 50% of the space each.

Having issues with a MySQL Join that needs to meet multiple conditions

If you join the facilities table twice you will get what you are after:

select u.* 
from room u 
  JOIN facilities_r fu1 on fu1.id_uc = u.id_uc and fu1.id_fu = '4'
  JOIN facilities_r fu2 on fu2.id_uc = u.id_uc and fu2.id_fu = '3' 
where 1 and vizibility='1' 
group by id_uc 
order by u_premium desc, id_uc desc

Can't import Numpy in Python

Your sys.path is kind of unusual, as each entry is prefixed with /usr/intel. I guess numpy is installed in the usual non-prefixed place, e.g. it. /usr/share/pyshared/numpy on my Ubuntu system.

Try find / -iname '*numpy*'

Only allow Numbers in input Tag without Javascript

Try this with the + after [0-9]:

input type="text" pattern="[0-9]+" title="number only"

How to set a binding in Code?

You need to change source to viewmodel object:

myBinding.Source = viewModelObject;

What is the shortcut in IntelliJ IDEA to find method / functions?

Slightly beside the actual question, but nonetheless useful: The Help menu of Intellij has an option 'Default Keymap reference', which opens a PDF with the complete mapping. (Ctrl+F12 is mentioned there)

How to subtract n days from current date in java?

As @Houcem Berrayana say

If you would like to use n>24 then you can use the code like:

Date dateBefore = new Date((d.getTime() - n * 24 * 3600 * 1000) - n * 24 * 3600 * 1000); 

Suppose you want to find last 30 days date, then you'd use:

Date dateBefore = new Date((d.getTime() - 24 * 24 * 3600 * 1000) - 6 * 24 * 3600 * 1000); 

The client and server cannot communicate, because they do not possess a common algorithm - ASP.NET C# IIS TLS 1.0 / 1.1 / 1.2 - Win32Exception

There are a couple of things that you need to check related to this.

Whenever there is an error like this thrown related to making a secure connection, try running a script like the one below in Powershell with the name of the machine or the uri (like "www.google.com") to get results back for each of the different protocol types:

 function Test-SocketSslProtocols {
    
    [CmdletBinding()] 
    param(
        [Parameter(Mandatory=$true)][string]$ComputerName,
        [int]$Port = 443,
        [string[]]$ProtocolNames = $null
        )

    #set results list    
    $ProtocolStatusObjArr = [System.Collections.ArrayList]@()


    if($ProtocolNames -eq $null){

        #if parameter $ProtocolNames empty get system list
        $ProtocolNames = [System.Security.Authentication.SslProtocols] | Get-Member -Static -MemberType Property | Where-Object { $_.Name -notin @("Default", "None") } | ForEach-Object { $_.Name }

    }
 
    foreach($ProtocolName in $ProtocolNames){

        #create and connect socket
        #use default port 443 unless defined otherwise
        #if the port specified is not listening it will throw in error
        #ensure listening port is a tls exposed port
        $Socket = New-Object System.Net.Sockets.Socket([System.Net.Sockets.SocketType]::Stream, [System.Net.Sockets.ProtocolType]::Tcp)
        $Socket.Connect($ComputerName, $Port)

        #initialize default obj
        $ProtocolStatusObj = [PSCustomObject]@{
            Computer = $ComputerName
            Port = $Port 
            ProtocolName = $ProtocolName
            IsActive = $false
            KeySize = $null
            SignatureAlgorithm = $null
            Certificate = $null
        }

        try {

            #create netstream
            $NetStream = New-Object System.Net.Sockets.NetworkStream($Socket, $true)

            #wrap stream in security sslstream
            $SslStream = New-Object System.Net.Security.SslStream($NetStream, $true)
            $SslStream.AuthenticateAsClient($ComputerName, $null, $ProtocolName, $false)
         
            $RemoteCertificate = [System.Security.Cryptography.X509Certificates.X509Certificate2]$SslStream.RemoteCertificate
            $ProtocolStatusObj.IsActive = $true
            $ProtocolStatusObj.KeySize = $RemoteCertificate.PublicKey.Key.KeySize
            $ProtocolStatusObj.SignatureAlgorithm = $RemoteCertificate.SignatureAlgorithm.FriendlyName
            $ProtocolStatusObj.Certificate = $RemoteCertificate

        } 
        catch  {

            $ProtocolStatusObj.IsActive = $false
            Write-Error "Failure to connect to machine $ComputerName using protocol: $ProtocolName."
            Write-Error $_

        }   
        finally {
            
            $SslStream.Close()
        
        }

        [void]$ProtocolStatusObjArr.Add($ProtocolStatusObj)

    }

    Write-Output $ProtocolStatusObjArr

}

Test-SocketSslProtocols -ComputerName "www.google.com"

It will try to establish socket connections and return complete objects for each attempt and successful connection.

After seeing what returns, check your computer registry via regedit (put "regedit" in run or look up "Registry Editor"), place

Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL

in the filepath and ensure that you have the appropriate TLS Protocol enabled for whatever server you're trying to connect to (from the results you had returned from the scripts). Adjust as necessary and then reset your computer (this is required). Try connecting with the powershell script again and see what results you get back. If still unsuccessful, ensure that the algorithms, hashes, and ciphers that need to be enabled are narrowing down what needs to be enabled (IISCrypto is a good application for this and is available for free. It will give you a real time view of what is enabled or disabled in your SChannel registry where all these things are located).

Also keep in mind the Windows version, DotNet version, and updates you have currently installed because despite a lot of TLS options being enabled by default in Windows 10, previous versions required patches to enable the option.

One last thing: TLS is a TWO-WAY street (keep this in mind) with the idea being that the server's having things available is just as important as the client. If the server only offers to connect via TLS 1.2 using certain algorithms then no client will be able to connect with anything else. Also, if the client won't connect with anything else other than a certain protocol or ciphersuite the connection won't work. Browsers are also something that need to be taken into account with this because of their forcing errors on HTTP2 for anything done with less than TLS 1.2 DESPITE there NOT actually being an error (they throw it to try and get people to upgrade but the registry settings do exist to modify this behavior).

How to find sum of multiple columns in a table in SQL Server 2005?

use a trigges it will work:-

->CREATE TRIGGER trigger_name BEFORE INSERT ON table_name

FOR EACH ROW SET NEW.column_name3 = NEW.column_name1 + NEW.column_name2;

this will only work only when you will insert a row in table not when you will be updating your table for such a pupose create another trigger of different name and use UPDATE on the place of INSERT in the above syntax

Error: Execution failed for task ':app:clean'. Unable to delete file

This issue appeared to me in android studio 2.0 stable channel and the solution was due to a problem happened while updating my android studio i solved this by installing a fresh android studio. after deleting all old files for the old installation. and to keep the very nice feature of Instant Run

Create a basic matrix in C (input by user !)

This is my answer

#include<stdio.h>
int main()
{int mat[100][100];
int row,column,i,j;
printf("enter how many row and colmn you want:\n \n");
scanf("%d",&row);
scanf("%d",&column);
printf("enter the matrix:");

for(i=0;i<row;i++){
    for(j=0;j<column;j++){
        scanf("%d",&mat[i][j]);
    }

printf("\n");
}

for(i=0;i<row;i++){
    for(j=0;j<column;j++){
        printf("%d \t",mat[i][j]);}

printf("\n");}
}

I just choose an approximate value for the row and column. My selected row or column will not cross the value.and then I scan the matrix element then make it in matrix size.

How to use "raise" keyword in Python

It has 2 purposes.

yentup has given the first one.

It's used for raising your own errors.

if something:
    raise Exception('My error!')

The second is to reraise the current exception in an exception handler, so that it can be handled further up the call stack.

try:
  generate_exception()
except SomeException as e:
  if not can_handle(e):
    raise
  handle_exception(e)

Parsing JSON Array within JSON Object

This could be an answer to your question:

JSONArray msg1 = (JSONArray) json.get("source");
for(int i = 0; i < msg1.length(); i++){
  String name = msg1.getString("name");
  int age     = msg1.getInt("age");
}

Convert unsigned int to signed int C

@Mysticial got it. A short is usually 16-bit and will illustrate the answer:

int main()  
{
    unsigned int x = 65529;
    int y = (int) x;
    printf("%d\n", y);

    unsigned short z = 65529;
    short zz = (short)z;
    printf("%d\n", zz);
}

65529
-7
Press any key to continue . . .


A little more detail. It's all about how signed numbers are stored in memory. Do a search for twos-complement notation for more detail, but here are the basics.

So let's look at 65529 decimal. It can be represented as FFF9h in hexadecimal. We can also represent that in binary as:

11111111 11111001

When we declare short zz = 65529;, the compiler interprets 65529 as a signed value. In twos-complement notation, the top bit signifies whether a signed value is positive or negative. In this case, you can see the top bit is a 1, so it is treated as a negative number. That's why it prints out -7.

For an unsigned short, we don't care about sign since it's unsigned. So when we print it out using %d, we use all 16 bits, so it's interpreted as 65529.

How to save a plot as image on the disk?

Like this

png('filename.png')
# make plot
dev.off()

or this

# sometimes plots do better in vector graphics
svg('filename.svg')
# make plot
dev.off()

or this

pdf('filename.pdf')
# make plot
dev.off()

And probably others too. They're all listed together in the help pages.

How do you stop MySQL on a Mac OS install?

Try

sudo <path to mysql>/support-files/mysql.server start
sudo <path to mysql>/support-files/mysql.server stop

Else try:

sudo /Library/StartupItems/MySQLCOM/MySQLCOM start
sudo /Library/StartupItems/MySQLCOM/MySQLCOM stop<br>
sudo /Library/StartupItems/MySQLCOM/MySQLCOM restart

However, I found that the second option only worked (OS X 10.6, MySQL 5.1.50) if the .plist has been loaded with:

sudo launchctl load -w /Library/LaunchDaemons/com.mysql.mysqld.plist

PS: I also found that I needed to unload the .plist to get an unrelated install of MAMP-MySQL to start / stop correctly. After running running this, MAMP-MySQL starts just fine:

sudo launchctl unload -w /Library/LaunchDaemons/com.mysql.mysqld.plist

Scroll Element into View with Selenium

For OpenQA.Selenium in C#:

WebDriver.ExecuteJavaScript("arguments[0].scrollIntoView({block: \"center\", inline: \"center\"});", Element);

Where WebDriver is new ChromeDriver(options) or similar.

Get random boolean in Java

Words in a text are always a source of randomness. Given a certain word, nothing can be inferred about the next word. For each word, we can take the ASCII codes of its letters, add those codes to form a number. The parity of this number is a good candidate for a random boolean.

Possible drawbacks:

  1. this strategy is based upon using a text file as a source for the words. At some point, the end of the file will be reached. However, you can estimate how many times you are expected to call the randomBoolean() function from your app. If you will need to call it about 1 million times, then a text file with 1 million words will be enough. As a correction, you can use a stream of data from a live source like an online newspaper.

  2. using some statistical analysis of the common phrases and idioms in a language, one can estimate the next word in a phrase, given the first words of the phrase, with some degree of accuracy. But statistically, these cases are rare, when we can accuratelly predict the next word. So, in most cases, the next word is independent on the previous words.

    package p01;

    import java.io.File; import java.nio.file.Files; import java.nio.file.Paths;

    public class Main {

    String words[];
    int currentIndex=0;
    
    public static String readFileAsString()throws Exception 
      { 
        String data = ""; 
        File file = new File("the_comedy_of_errors");
        //System.out.println(file.exists());
        data = new String(Files.readAllBytes(Paths.get(file.getName()))); 
        return data; 
      } 
    
    public void init() throws Exception
    {
        String data = readFileAsString(); 
        words = data.split("\\t| |,|\\.|'|\\r|\\n|:");
    }
    
    public String getNextWord() throws Exception
    {
        if(currentIndex>words.length-1)
            throw new Exception("out of words; reached end of file");
    
        String currentWord = words[currentIndex];
        currentIndex++;
    
        while(currentWord.isEmpty())
        {
            currentWord = words[currentIndex];
            currentIndex++;
        }
    
        return currentWord;
    }
    
    public boolean getNextRandom() throws Exception
    {
        String nextWord = getNextWord();
        int asciiSum = 0;
    
        for (int i = 0; i < nextWord.length(); i++){
            char c = nextWord.charAt(i);        
            asciiSum = asciiSum + (int) c;
        }
    
        System.out.println(nextWord+"-"+asciiSum);
    
        return (asciiSum%2==1) ;
    }
    
    public static void main(String args[]) throws Exception
    {
        Main m = new Main();
        m.init();
        while(true)
        {
            System.out.println(m.getNextRandom());
            Thread.sleep(100);
        }
    }
    

    }

In Eclipse, in the root of my project, there is a file called 'the_comedy_of_errors' (no extension) - created with File> New > File , where I pasted some content from here: http://shakespeare.mit.edu/comedy_errors/comedy_errors.1.1.html

delete_all vs destroy_all?

I’ve made a small gem that can alleviate the need to manually delete associated records in some circumstances.

This gem adds a new option for ActiveRecord associations:

dependent: :delete_recursively

When you destroy a record, all records that are associated using this option will be deleted recursively (i.e. across models), without instantiating any of them.

Note that, just like dependent: :delete or dependent: :delete_all, this new option does not trigger the around/before/after_destroy callbacks of the dependent records.

However, it is possible to have dependent: :destroy associations anywhere within a chain of models that are otherwise associated with dependent: :delete_recursively. The :destroy option will work normally anywhere up or down the line, instantiating and destroying all relevant records and thus also triggering their callbacks.

"405 method not allowed" in IIS7.5 for "PUT" method

I was using Angular 8 and was .NET core API. I add the following in my service web.config file. That resolve my error.

<system.webServer>
  <modules runAllManagedModulesForAllRequests="false">
    <remove name="WebDAVModule" />
  </modules>
</system.webServer>

How do I return clean JSON from a WCF Service?

If you want nice json without hardcoding attributes into your service classes,

use <webHttp defaultOutgoingResponseFormat="Json"/> in your behavior config

How do I pass a URL with multiple parameters into a URL?

I see you're having issues with the social share links. I had a similar issue at some point and found this question, but I don't see a complete answer for it. I hope my javascript resolution from below will help:

I had default sharing links that needed to be modified so that the URL that's being shared will have additional UTM parameters concatenated.

My example will be for the Facebook social share link, but it works for all the possible social sharing network links:

The URL that needed to be shared was:

https://mywebsitesite.com/blog/post-name

The default sharing link looked like:

$facebook_default = "https://www.facebook.com/sharer.php?u=https%3A%2F%2mywebsitesite.com%2Fblog%2Fpost-name%2F&t=hello"

I first DECODED it:

console.log( decodeURIComponent($facebook_default) );
=>
https://www.facebook.com/sharer.php?u=https://mywebsitesite.com/blog/post-name/&t=hello

Then I replaced the URL with the encoded new URL (with the UTM parameters concatenated):

console.log( decodeURIComponent($facebook_default).replace( window.location.href, encodeURIComponent(window.location.href+'?utm_medium=social&utm_source=facebook')) );

=>

https://www.facebook.com/sharer.php?u=https%3A%2F%mywebsitesite.com%2Fblog%2Fpost-name%2F%3Futm_medium%3Dsocial%26utm_source%3Dfacebook&t=2018

That's it!

Complete solution:

$facebook_default = $('a.facebook_default_link').attr('href');

$('a.facebook_default_link').attr( 'href', decodeURIComponent($facebook_default).replace( window.location.href, encodeURIComponent(window.location.href+'?utm_medium=social&utm_source=facebook')) );

Bootstrap alert in a fixed floating div at the top of page

The simplest approach would be to use any of these class utilities that Bootstrap provides:

<div class="position-fixed">...</div>
<div class="position-sticky">...</div>
<div class="fixed-top">...</div>
<div class="fixed-bottom">...</div>
<div class="sticky-top">...</div>

https://getbootstrap.com/docs/4.0/utilities/position

Create multiple threads and wait all of them to complete

It depends which version of the .NET Framework you are using. .NET 4.0 made thread management a whole lot easier using Tasks:

class Program
{
    static void Main(string[] args)
    {
        Task task1 = Task.Factory.StartNew(() => doStuff());
        Task task2 = Task.Factory.StartNew(() => doStuff());
        Task task3 = Task.Factory.StartNew(() => doStuff());

        Task.WaitAll(task1, task2, task3);
                Console.WriteLine("All threads complete");
    }

    static void doStuff()
    {
        //do stuff here
    }
}

In previous versions of .NET you could use the BackgroundWorker object, use ThreadPool.QueueUserWorkItem(), or create your threads manually and use Thread.Join() to wait for them to complete:

static void Main(string[] args)
{
    Thread t1 = new Thread(doStuff);
    t1.Start();

    Thread t2 = new Thread(doStuff);
    t2.Start();

    Thread t3 = new Thread(doStuff);
    t3.Start();

    t1.Join();
    t2.Join();
    t3.Join();

    Console.WriteLine("All threads complete");
}

How to find the most recent file in a directory using .NET, and without looping?

Short and simple:

new DirectoryInfo(path).GetFiles().OrderByDescending(o => o.LastWriteTime).FirstOrDefault();

Finding duplicate integers in an array and display how many times they occurred

static void printRepeating(int []arr, int size) { int i;

    Console.Write("The repeating" +  
                   " elements are : "); 

    for (i = 0; i < size; i++) 
    { 
        if (arr[ Math.Abs(arr[i])] >= 0) 
            arr[ Math.Abs(arr[i])] = 
                -arr[ Math.Abs(arr[i])]; 
        else
            Console.Write(Math.Abs(arr[i]) + " "); 
    }          
}  

ASP.Net 2012 Unobtrusive Validation with jQuery

<add key="ValidationSettings:UnobtrusiveValidationMode" value="WebForms" />

this line was not in my WebConfig so : I simple solved this by downgrading targetting .Net version to 4.0 :)

HTML5 tag for horizontal line break

You can make a div that has the same attributes as the <hr> tag. This way it is fully able to be customized. Here is some sample code:

The HTML:

<h3>This is a header.</h3>
<div class="customHr">.</div>

<p>Here is some sample paragraph text.<br>
This demonstrates what could go below a custom hr.</p>

The CSS:

.customHr {
    width: 95%
    font-size: 1px;
    color: rgba(0, 0, 0, 0);
    line-height: 1px;

    background-color: grey;
    margin-top: -6px;
    margin-bottom: 10px;
}

To see how the project turns out, here is a JSFiddle for the above code: http://jsfiddle.net/SplashHero/qmccsc06/1/

Matplotlib (pyplot) savefig outputs blank image

First, what happens when T0 is not None? I would test that, then I would adjust the values I pass to plt.subplot(); maybe try values 131, 132, and 133, or values that depend whether or not T0 exists.

Second, after plt.show() is called, a new figure is created. To deal with this, you can

  1. Call plt.savefig('tessstttyyy.png', dpi=100) before you call plt.show()

  2. Save the figure before you show() by calling plt.gcf() for "get current figure", then you can call savefig() on this Figure object at any time.

For example:

fig1 = plt.gcf()
plt.show()
plt.draw()
fig1.savefig('tessstttyyy.png', dpi=100)

In your code, 'tesssttyyy.png' is blank because it is saving the new figure, to which nothing has been plotted.

How to insert values into the database table using VBA in MS access

  1. Remove this line of code: For i = 1 To DatDiff. A For loop must have the word NEXT
  2. Also, remove this line of code: StrSQL = StrSQL & "SELECT 'Test'" because its making Access look at your final SQL statement like this; INSERT INTO Test (Start_Date) VALUES ('" & InDate & "' );SELECT 'Test' Notice the semicolon in the middle of the SQL statement (should always be at the end. its by the way not required. you can also omit it). also, there is no space between the semicolon and the key word SELECT

in summary: remove those two lines of code above and your insert statement will work fine. You can the modify the code it later to suit your specific needs. And by the way, some times, you have to enclose dates in pounds signs like #

Java verify void method calls n times with Mockito

The necessary method is Mockito#verify:

public static <T> T verify(T mock,
                           VerificationMode mode)

mock is your mocked object and mode is the VerificationMode that describes how the mock should be verified. Possible modes are:

verify(mock, times(5)).someMethod("was called five times");
verify(mock, never()).someMethod("was never called");
verify(mock, atLeastOnce()).someMethod("was called at least once");
verify(mock, atLeast(2)).someMethod("was called at least twice");
verify(mock, atMost(3)).someMethod("was called at most 3 times");
verify(mock, atLeast(0)).someMethod("was called any number of times"); // useful with captors
verify(mock, only()).someMethod("no other method has been called on the mock");

You'll need these static imports from the Mockito class in order to use the verify method and these verification modes:

import static org.mockito.Mockito.atLeast;
import static org.mockito.Mockito.atLeastOnce;
import static org.mockito.Mockito.atMost;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.only;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;

So in your case the correct syntax will be:

Mockito.verify(mock, times(4)).send()

This verifies that the method send was called 4 times on the mocked object. It will fail if it was called less or more than 4 times.


If you just want to check, if the method has been called once, then you don't need to pass a VerificationMode. A simple

verify(mock).someMethod("was called once");

would be enough. It internally uses verify(mock, times(1)).someMethod("was called once");.


It is possible to have multiple verification calls on the same mock to achieve a "between" verification. Mockito doesn't support something like this verify(mock, between(4,6)).someMethod("was called between 4 and 6 times");, but we can write

verify(mock, atLeast(4)).someMethod("was called at least four times ...");
verify(mock, atMost(6)).someMethod("... and not more than six times");

instead, to get the same behaviour. The bounds are included, so the test case is green when the method was called 4, 5 or 6 times.

How does one Display a Hyperlink in React Native App?

Something like this:

<Text style={{color: 'blue'}}
      onPress={() => Linking.openURL('http://google.com')}>
  Google
</Text>

using the Linking module that's bundled with React Native.

How can I check the size of a collection within a Django template?

If you tried myList|length and myList|length_is and its not getting desired results, then you should use myList.count

Least common multiple for 3 or more numbers

Here is the PHP implementation:

    // https://stackoverflow.com/q/12412782/1066234
    function math_gcd($a,$b) 
    {
        $a = abs($a); 
        $b = abs($b);
        if($a < $b) 
        {
            list($b,$a) = array($a,$b); 
        }
        if($b == 0) 
        {
            return $a;      
        }
        $r = $a % $b;
        while($r > 0) 
        {
            $a = $b;
            $b = $r;
            $r = $a % $b;
        }
        return $b;
    }

    function math_lcm($a, $b)
    {
        return ($a * $b / math_gcd($a, $b));
    }

    // https://stackoverflow.com/a/2641293/1066234
    function math_lcmm($args)
    {
        // Recursively iterate through pairs of arguments
        // i.e. lcm(args[0], lcm(args[1], lcm(args[2], args[3])))

        if(count($args) == 2)
        {
            return math_lcm($args[0], $args[1]);
        }
        else 
        {
            $arg0 = $args[0];
            array_shift($args);
            return math_lcm($arg0, math_lcmm($args));
        }
    }

    // fraction bonus
    function math_fraction_simplify($num, $den) 
    {
        $g = math_gcd($num, $den);
        return array($num/$g, $den/$g);
    }


    var_dump( math_lcmm( array(4, 7) ) ); // 28
    var_dump( math_lcmm( array(5, 25) ) ); // 25
    var_dump( math_lcmm( array(3, 4, 12, 36) ) ); // 36
    var_dump( math_lcmm( array(3, 4, 7, 12, 36) ) ); // 252

Credits go to @T3db0t with his answer above (ECMA-style code).

Jenkins: Cannot define variable in pipeline stage

Agree with @Pom12, @abayer. To complete the answer you need to add script block

Try something like this:

pipeline {
    agent any
    environment {
        ENV_NAME = "${env.BRANCH_NAME}"
    }

    // ----------------

    stages {
        stage('Build Container') {
            steps {
                echo 'Building Container..'

                script {
                    if (ENVIRONMENT_NAME == 'development') {
                        ENV_NAME = 'Development'
                    } else if (ENVIRONMENT_NAME == 'release') {
                        ENV_NAME = 'Production'
                    }
                }
                echo 'Building Branch: ' + env.BRANCH_NAME
                echo 'Build Number: ' + env.BUILD_NUMBER
                echo 'Building Environment: ' + ENV_NAME

                echo "Running your service with environemnt ${ENV_NAME} now"
            }
        }
    }
}

Locate Git installation folder on Mac OS X

If you have fresh installation / update of Xcode, it is possible that your git binary can't be executed (I had mine under /usr/bin/git). To fix this problem just run the Xcode and "Accept" license conditions and try again, it should work.

What is TypeScript and why would I use it in place of JavaScript?

TypeScript's relation to JavaScript

TypeScript is a typed superset of JavaScript that compiles to plain JavaScript - typescriptlang.org.

JavaScript is a programming language that is developed by EMCA's Technical Committee 39, which is a group of people composed of many different stakeholders. TC39 is a committee hosted by ECMA: an internal standards organization. JavaScript has many different implementations by many different vendors (e.g. Google, Microsoft, Oracle, etc.). The goal of JavaScript is to be the lingua franca of the web.

TypeScript is a superset of the JavaScript language that has a single open-source compiler and is developed mainly by a single vendor: Microsoft. The goal of TypeScript is to help catch mistakes early through a type system and to make JavaScript development more efficient.

Essentially TypeScript achieves its goals in three ways:

  1. Support for modern JavaScript features - The JavaScript language (not the runtime) is standardized through the ECMAScript standards. Not all browsers and JavaScript runtimes support all features of all ECMAScript standards (see this overview). TypeScript allows for the use of many of the latest ECMAScript features and translates them to older ECMAScript targets of your choosing (see the list of compile targets under the --target compiler option). This means that you can safely use new features, like modules, lambda functions, classes, the spread operator and destructuring, while remaining backwards compatible with older browsers and JavaScript runtimes.

  2. Advanced type system - The type support is not part of the ECMAScript standard and will likely never be due to the interpreted nature instead of compiled nature of JavaScript. The type system of TypeScript is incredibly rich and includes: interfaces, enums, hybrid types, generics, union/intersection types, access modifiers and much more. The official website of TypeScript gives an overview of these features. Typescript's type system is on-par with most other typed languages and in some cases arguably more powerful.

  3. Developer tooling support - TypeScript's compiler can run as a background process to support both incremental compilation and IDE integration such that you can more easily navigate, identify problems, inspect possibilities and refactor your codebase.

TypeScript's relation to other JavaScript targeting languages

TypeScript has a unique philosophy compared to other languages that compile to JavaScript. JavaScript code is valid TypeScript code; TypeScript is a superset of JavaScript. You can almost rename your .js files to .ts files and start using TypeScript (see "JavaScript interoperability" below). TypeScript files are compiled to readable JavaScript, so that migration back is possible and understanding the compiled TypeScript is not hard at all. TypeScript builds on the successes of JavaScript while improving on its weaknesses.

On the one hand, you have future proof tools that take modern ECMAScript standards and compile it down to older JavaScript versions with Babel being the most popular one. On the other hand, you have languages that may totally differ from JavaScript which target JavaScript, like CoffeeScript, Clojure, Dart, Elm, Haxe, Scala.js, and a whole host more (see this list). These languages, though they might be better than where JavaScript's future might ever lead, run a greater risk of not finding enough adoption for their futures to be guaranteed. You might also have more trouble finding experienced developers for some of these languages, though the ones you will find can often be more enthusiastic. Interop with JavaScript can also be a bit more involved, since they are farther removed from what JavaScript actually is.

TypeScript sits in between these two extremes, thus balancing the risk. TypeScript is not a risky choice by any standard. It takes very little effort to get used to if you are familiar with JavaScript, since it is not a completely different language, has excellent JavaScript interoperability support and it has seen a lot of adoption recently.

Optionally static typing and type inference

JavaScript is dynamically typed. This means JavaScript does not know what type a variable is until it is actually instantiated at run-time. This also means that it may be too late. TypeScript adds type support to JavaScript and catches type errors during compilation to JavaScript. Bugs that are caused by false assumptions of some variable being of a certain type can be completely eradicated if you play your cards right (how strict you type your code or if you type your code at all is up to you).

TypeScript makes typing a bit easier and a lot less explicit by the usage of type inference. For example: var x = "hello" in TypeScript is the same as var x : string = "hello". The type is simply inferred from its use. Even it you don't explicitly type the types, they are still there to save you from doing something which otherwise would result in a run-time error.

TypeScript is optionally typed by default. For example function divideByTwo(x) { return x / 2 } is a valid function in TypeScript which can be called with any kind of parameter, even though calling it with a string will obviously result in a runtime error. Just like you are used to in JavaScript. This works, because when no type was explicitly assigned and the type could not be inferred, like in the divideByTwo example, TypeScript will implicitly assign the type any. This means the divideByTwo function's type signature automatically becomes function divideByTwo(x : any) : any. There is a compiler flag to disallow this behavior: --noImplicitAny. Enabling this flag gives you a greater degree of safety, but also means you will have to do more typing.

Types have a cost associated with them. First of all, there is a learning curve, and second of all, of course, it will cost you a bit more time to set up a codebase using proper strict typing too. In my experience, these costs are totally worth it on any serious codebase you are sharing with others. A Large Scale Study of Programming Languages and Code Quality in Github suggests that "statically typed languages, in general, are less defect prone than the dynamic types, and that strong typing is better than weak typing in the same regard".

It is interesting to note that this very same paper finds that TypeScript is less error-prone than JavaScript:

For those with positive coefficients we can expect that the language is associated with, ceteris paribus, a greater number of defect fixes. These languages include C, C++, JavaScript, Objective-C, Php, and Python. The languages Clojure, Haskell, Ruby, Scala, and TypeScript, all have negative coefficients implying that these languages are less likely than the average to result in defect fixing commits.

Enhanced IDE support

The development experience with TypeScript is a great improvement over JavaScript. The IDE is informed in real-time by the TypeScript compiler on its rich type information. This gives a couple of major advantages. For example, with TypeScript, you can safely do refactorings like renames across your entire codebase. Through code completion, you can get inline help on whatever functions a library might offer. No more need to remember them or look them up in online references. Compilation errors are reported directly in the IDE with a red squiggly line while you are busy coding. All in all, this allows for a significant gain in productivity compared to working with JavaScript. One can spend more time coding and less time debugging.

There is a wide range of IDEs that have excellent support for TypeScript, like Visual Studio Code, WebStorm, Atom and Sublime.

Strict null checks

Runtime errors of the form cannot read property 'x' of undefined or undefined is not a function are very commonly caused by bugs in JavaScript code. Out of the box TypeScript already reduces the probability of these kinds of errors occurring, since one cannot use a variable that is not known to the TypeScript compiler (with the exception of properties of any typed variables). It is still possible though to mistakenly utilize a variable that is set to undefined. However, with the 2.0 version of TypeScript you can eliminate these kinds of errors all together through the usage of non-nullable types. This works as follows:

With strict null checks enabled (--strictNullChecks compiler flag) the TypeScript compiler will not allow undefined to be assigned to a variable unless you explicitly declare it to be of nullable type. For example, let x : number = undefined will result in a compile error. This fits perfectly with type theory since undefined is not a number. One can define x to be a sum type of number and undefined to correct this: let x : number | undefined = undefined.

Once a type is known to be nullable, meaning it is of a type that can also be of the value null or undefined, the TypeScript compiler can determine through control flow based type analysis whether or not your code can safely use a variable or not. In other words when you check a variable is undefined through for example an if statement the TypeScript compiler will infer that the type in that branch of your code's control flow is not anymore nullable and therefore can safely be used. Here is a simple example:

let x: number | undefined;
if (x !== undefined) x += 1; // this line will compile, because x is checked.
x += 1; // this line will fail compilation, because x might be undefined.

During the build, 2016 conference co-designer of TypeScript Anders Hejlsberg gave a detailed explanation and demonstration of this feature: video (from 44:30 to 56:30).

Compilation

To use TypeScript you need a build process to compile to JavaScript code. The build process generally takes only a couple of seconds depending of course on the size of your project. The TypeScript compiler supports incremental compilation (--watch compiler flag) so that all subsequent changes can be compiled at greater speed.

The TypeScript compiler can inline source map information in the generated .js files or create separate .map files. Source map information can be used by debugging utilities like the Chrome DevTools and other IDE's to relate the lines in the JavaScript to the ones that generated them in the TypeScript. This makes it possible for you to set breakpoints and inspect variables during runtime directly on your TypeScript code. Source map information works pretty well, it was around long before TypeScript, but debugging TypeScript is generally not as great as when using JavaScript directly. Take the this keyword for example. Due to the changed semantics of the this keyword around closures since ES2015, this may actually exists during runtime as a variable called _this (see this answer). This may confuse you during debugging but generally is not a problem if you know about it or inspect the JavaScript code. It should be noted that Babel suffers the exact same kind of issue.

There are a few other tricks the TypeScript compiler can do, like generating intercepting code based on decorators, generating module loading code for different module systems and parsing JSX. However, you will likely require a build tool besides the Typescript compiler. For example, if you want to compress your code you will have to add other tools to your build process to do so.

There are TypeScript compilation plugins available for Webpack, Gulp, Grunt and pretty much any other JavaScript build tool out there. The TypeScript documentation has a section on integrating with build tools covering them all. A linter is also available in case you would like even more build time checking. There are also a great number of seed projects out there that will get you started with TypeScript in combination with a bunch of other technologies like Angular 2, React, Ember, SystemJS, Webpack, Gulp, etc.

JavaScript interoperability

Since TypeScript is so closely related to JavaScript it has great interoperability capabilities, but some extra work is required to work with JavaScript libraries in TypeScript. TypeScript definitions are needed so that the TypeScript compiler understands that function calls like _.groupBy or angular.copy or $.fadeOut are not in fact illegal statements. The definitions for these functions are placed in .d.ts files.

The simplest form a definition can take is to allow an identifier to be used in any way. For example, when using Lodash, a single line definition file declare var _ : any will allow you to call any function you want on _, but then, of course, you are also still able to make mistakes: _.foobar() would be a legal TypeScript call, but is, of course, an illegal call at run-time. If you want proper type support and code completion your definition file needs to to be more exact (see lodash definitions for an example).

Npm modules that come pre-packaged with their own type definitions are automatically understood by the TypeScript compiler (see documentation). For pretty much any other semi-popular JavaScript library that does not include its own definitions somebody out there has already made type definitions available through another npm module. These modules are prefixed with "@types/" and come from a Github repository called DefinitelyTyped.

There is one caveat: the type definitions must match the version of the library you are using at run-time. If they do not, TypeScript might disallow you from calling a function or dereferencing a variable that exists or allow you to call a function or dereference a variable that does not exist, simply because the types do not match the run-time at compile-time. So make sure you load the right version of the type definitions for the right version of the library you are using.

To be honest, there is a slight hassle to this and it may be one of the reasons you do not choose TypeScript, but instead go for something like Babel that does not suffer from having to get type definitions at all. On the other hand, if you know what you are doing you can easily overcome any kind of issues caused by incorrect or missing definition files.

Converting from JavaScript to TypeScript

Any .js file can be renamed to a .ts file and ran through the TypeScript compiler to get syntactically the same JavaScript code as an output (if it was syntactically correct in the first place). Even when the TypeScript compiler gets compilation errors it will still produce a .js file. It can even accept .js files as input with the --allowJs flag. This allows you to start with TypeScript right away. Unfortunately, compilation errors are likely to occur in the beginning. One does need to remember that these are not show-stopping errors like you may be used to with other compilers.

The compilation errors one gets in the beginning when converting a JavaScript project to a TypeScript project are unavoidable by TypeScript's nature. TypeScript checks all code for validity and thus it needs to know about all functions and variables that are used. Thus type definitions need to be in place for all of them otherwise compilation errors are bound to occur. As mentioned in the chapter above, for pretty much any JavaScript framework there are .d.ts files that can easily be acquired with the installation of DefinitelyTyped packages. It might, however, be that you've used some obscure library for which no TypeScript definitions are available or that you've polyfilled some JavaScript primitives. In that case, you must supply type definitions for these bits for the compilation errors to disappear. Just create a .d.ts file and include it in the tsconfig.json's files array, so that it is always considered by the TypeScript compiler. In it declare those bits that TypeScript does not know about as type any. Once you've eliminated all errors you can gradually introduce typing to those parts according to your needs.

Some work on (re)configuring your build pipeline will also be needed to get TypeScript into the build pipeline. As mentioned in the chapter on compilation there are plenty of good resources out there and I encourage you to look for seed projects that use the combination of tools you want to be working with.

The biggest hurdle is the learning curve. I encourage you to play around with a small project at first. Look how it works, how it builds, which files it uses, how it is configured, how it functions in your IDE, how it is structured, which tools it uses, etc. Converting a large JavaScript codebase to TypeScript is doable when you know what you are doing. Read this blog for example on converting 600k lines to typescript in 72 hours). Just make sure you have a good grasp of the language before you make the jump.

Adoption

TypeScript is open-source (Apache 2 licensed, see GitHub) and backed by Microsoft. Anders Hejlsberg, the lead architect of C# is spearheading the project. It's a very active project; the TypeScript team has been releasing a lot of new features in the last few years and a lot of great ones are still planned to come (see the roadmap).

Some facts about adoption and popularity:

  • In the 2017 StackOverflow developer survey TypeScript was the most popular JavaScript transpiler (9th place overall) and won third place in the most loved programming language category.
  • In the 2018 state of js survey TypeScript was declared as one of the two big winners in the JavaScript flavors category (with ES6 being the other).
  • In the 2019 StackOverlow deverloper survey TypeScript rose to the 9th place of most popular languages amongst professional developers, overtaking both C and C++. It again took third place amongst most the most loved languages.

Android selector & text color

Have you tried setOnFocusChangeListener? Within the handler, you could change the text appearance.

For instance:

TextView text = (TextView)findViewById(R.id.text);
text.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            ((TextView)v).setXXXX();
        } else {
            ((TextView)v).setXXXX();
        }
    }
});

You can then apply whatever changes you want when it's focused or not. You can also use the ViewTreeObserver to listen for Global focus changes.

For instance:

View all = findViewById(R.id.id_of_top_level_view_on_layout);
ViewTreeObserver vto = all.getViewTreeObserver();
vto.addOnGlobalFocusChangeListener(new ViewTreeObserver.OnGlobalFocusChangeListener() {
    public void onGlobalFocusChanged(
        View oldFocus, View newFocus) {
        // xxxx
    }
});

I hope this helps or gives you ideas.

php get values from json encode

json_decode() will return an object or array if second value it's true:

$json = '{"countryId":"84","productId":"1","status":"0","opId":"134"}';
$json = json_decode($json, true);
echo $json['countryId'];
echo $json['productId'];
echo $json['status'];
echo $json['opId'];

How do I get this javascript to run every second?

You can use setTimeout to run the function/command once or setInterval to run the function/command at specified intervals.

var a = setTimeout("alert('run just one time')",500);
var b = setInterval("alert('run each 3 seconds')",3000);

//To abort the interval you can use this:
clearInterval(b);

Calculating Covariance with Python and Numpy

Thanks to unutbu for the explanation. By default numpy.cov calculates the sample covariance. To obtain the population covariance you can specify normalisation by the total N samples like this:

Covariance = numpy.cov(a, b, bias=True)[0][1]
print(Covariance)

or like this:

Covariance = numpy.cov(a, b, ddof=0)[0][1]
print(Covariance)

MySQL: Error dropping database (errno 13; errno 17; errno 39)

in linux , Just go to "/var/lib/mysql" right click and (open as adminstrator), find the folder corresponding to your database name inside mysql folder and delete it. that's it. Database is dropped.

How do I remove the old history from a git repository?

If you want to keep the upstream repository with full history, but local smaller checkouts, do a shallow clone with git clone --depth=1 [repo].

After pushing a commit, you can do

  1. git fetch --depth=1 to prune the old commits. This makes the old commits and their objects unreachable.
  2. git reflog expire --expire-unreachable=now --all. To expire all old commits and their objects
  3. git gc --aggressive --prune=all to remove the old objects

See also How to remove local git history after a commit?.

Note that you cannot push this "shallow" repository to somewhere else: "shallow update not allowed". See Remote rejected (shallow update not allowed) after changing Git remote URL. If you want to to that, you have to stick with grafting.

Reading in from System.in - Java

Use System.in, it is an InputStream which just serves this purpose

makefile:4: *** missing separator. Stop

The key point was "HARD TAB" 1. Check whether you used TAB instead of whitespace 2. Check your .vimrc for "set tabstop=X"

Access to the path denied error in C#

If your problem persist with all those answers, try to change the file attribute to:

File.SetAttributes(yourfile, FileAttributes.Normal);

Using numpy to build an array of all combinations of two arrays

It looks like you want a grid to evaluate your function, in which case you can use numpy.ogrid (open) or numpy.mgrid (fleshed out):

import numpy
my_grid = numpy.mgrid[[slice(0,1,0.1)]*6]

How to log a method's execution time exactly in milliseconds?

I use this code:

#import <mach/mach_time.h>

float TIME_BLOCK(NSString *key, void (^block)(void)) {
    mach_timebase_info_data_t info;
    if (mach_timebase_info(&info) != KERN_SUCCESS)
    {
        return -1.0;
    }

    uint64_t start = mach_absolute_time();
    block();
    uint64_t end = mach_absolute_time();
    uint64_t elapsed = end - start;

    uint64_t nanos = elapsed * info.numer / info.denom;
    float cost = (float)nanos / NSEC_PER_SEC;

    NSLog(@"key: %@ (%f ms)\n", key, cost * 1000);
    return cost;
}

Need to list all triggers in SQL Server database with table name and table's schema

The just above code is incorrect as shown:

SELECT 
    sysobjects.name AS trigger_name 
    --,USER_NAME(sysobjects.uid) AS trigger_owner 
    --,s.name AS table_schema 
    --,OBJECT_NAME(parent_obj) AS table_name 
    --,OBJECTPROPERTY( id, 'ExecIsUpdateTrigger') AS isupdate 
    --,OBJECTPROPERTY( id, 'ExecIsDeleteTrigger') AS isdelete 
    --,OBJECTPROPERTY( id, 'ExecIsInsertTrigger') AS isinsert 
    --,OBJECTPROPERTY( id, 'ExecIsAfterTrigger') AS isafter 
    --,OBJECTPROPERTY( id, 'ExecIsInsteadOfTrigger') AS isinsteadof 
    --,OBJECTPROPERTY(id, 'ExecIsTriggerDisabled') AS [disabled] 
FROM sysobjects 
/*
INNER JOIN sysusers 
    ON sysobjects.uid = sysusers.uid 
*/  
INNER JOIN sys.tables t 
    ON sysobjects.parent_obj = t.object_id 

INNER JOIN sys.schemas s 
    ON t.schema_id = s.schema_id 
WHERE sysobjects.type = 'TR' 
EXCEPT
SELECT OBJECT_NAME(parent_id) as Table_Name FROM sys.triggers

How can I know which radio button is selected via jQuery?

DEMO : https://jsfiddle.net/ipsjolly/xygr065w/

_x000D_
_x000D_
 $(function(){_x000D_
     $("#submit").click(function(){      _x000D_
         alert($('input:radio:checked').val());_x000D_
     });_x000D_
  });
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<table>_x000D_
       <tr>_x000D_
         <td>Sales Promotion</td>_x000D_
         <td><input type="radio" name="q12_3" value="1">1</td>_x000D_
         <td><input type="radio" name="q12_3" value="2">2</td>_x000D_
         <td><input type="radio" name="q12_3" value="3">3</td>_x000D_
         <td><input type="radio" name="q12_3" value="4">4</td>_x000D_
         <td><input type="radio" name="q12_3" value="5">5</td>_x000D_
      </tr>_x000D_
    </table>_x000D_
<button id="submit">submit</button>
_x000D_
_x000D_
_x000D_

Can an AWS Lambda function call another

Since this question was asked, Amazon has released Step Functions (https://aws.amazon.com/step-functions/).

One of the core principles behind AWS Lambda is that you can focus more on business logic and less on the application logic that ties it all together. Step functions allows you to orchestrate complex interactions between functions without having to write the code to do it.

How do I correctly clean up a Python object?

It seems that the idiomatic way to do this is to provide a close() method (or similar), and call it explicitely.

How to remove items from a list while iterating?

If you want to do anything else during the iteration, it may be nice to get both the index (which guarantees you being able to reference it, for example if you have a list of dicts) and the actual list item contents.

inlist = [{'field1':10, 'field2':20}, {'field1':30, 'field2':15}]    
for idx, i in enumerate(inlist):
    do some stuff with i['field1']
    if somecondition:
        xlist.append(idx)
for i in reversed(xlist): del inlist[i]

enumerate gives you access to the item and the index at once. reversed is so that the indices that you're going to later delete don't change on you.

SQL Joins Vs SQL Subqueries (Performance)?

Performance is based on the amount of data you are executing on...

If it is less data around 20k. JOIN works better.

If the data is more like 100k+ then IN works better.

If you do not need the data from the other table, IN is good, But it is alwys better to go for EXISTS.

All these criterias I tested and the tables have proper indexes.

I get exception when using Thread.sleep(x) or wait()

My ways to add delay to a Java program.

public void pause1(long sleeptime) {
    try {
        Thread.sleep(sleeptime);
    } catch (InterruptedException ex) {
        //ToCatchOrNot
    }
}

public void pause2(long sleeptime) {
    Object obj = new Object();
    if (sleeptime > 0) {
        synchronized (obj) {
            try {
                obj.wait(sleeptime);
            } catch (InterruptedException ex) {
                //ToCatchOrNot
            }
        }
    }
}
public void pause3(long sleeptime) {
    expectedtime = System.currentTimeMillis() + sleeptime;
    while (System.currentTimeMillis() < expectedtime) {
        //Empty Loop   
    }
}

This is for sequential delay but for Loop delays refer to Java Delay/Wait.

Avoid synchronized(this) in Java?

If you've decided that:

  • the thing you need to do is lock on the current object; and
  • you want to lock it with granularity smaller than a whole method;

then I don't see the a taboo over synchronizezd(this).

Some people deliberately use synchronized(this) (instead of marking the method synchronized) inside the whole contents of a method because they think it's "clearer to the reader" which object is actually being synchronized on. So long as people are making an informed choice (e.g. understand that by doing so they're actually inserting extra bytecodes into the method and this could have a knock-on effect on potential optimisations), I don't particularly see a problem with this. You should always document the concurrent behaviour of your program, so I don't see the "'synchronized' publishes the behaviour" argument as being so compelling.

As to the question of which object's lock you should use, I think there's nothing wrong with synchronizing on the current object if this would be expected by the logic of what you're doing and how your class would typically be used. For example, with a collection, the object that you would logically expect to lock is generally the collection itself.

Applying styles to tables with Twitter Bootstrap

Just another good looking table. I added "table-hover" class because it gives a nice hovering effect.

   <h3>NATO Phonetic Alphabet</h3>    
   <table class="table table-striped table-bordered table-condensed table-hover">
   <thead>
    <tr> 
        <th>Letter</th>
        <th>Phonetic Letter</th>

    </tr>
    </thead>
  <tr>
    <th>A</th>
    <th>Alpha</th>

  </tr>
  <tr>
    <td>B</td>
    <td>Bravo</td>

  </tr>
  <tr>
    <td>C</td>
    <td>Charlie</td>

  </tr>

</table>

how to run a command at terminal from java program?

I know this question is quite old, but here's a library that encapsulates the ProcessBuilder api.

How to uninstall Eclipse?

The steps are very simple and it'll take just few mins. 1.Go to your C drive and in that go to the 'USER' section. 2.Under 'USER' section go to your 'name(e.g-'user1') and then find ".eclipse" folder and delete that folder 3.Along with that folder also delete "eclipse" folder and you can find that you're work has been done completely.

Calling Python in Java?

Jython has some limitations:

There are a number of differences. First, Jython programs cannot use CPython extension modules written in C. These modules usually have files with the extension .so, .pyd or .dll. If you want to use such a module, you should look for an equivalent written in pure Python or Java. Although it is technically feasible to support such extensions - IronPython does so - there are no plans to do so in Jython.

Distributing my Python scripts as JAR files with Jython?

you can simply call python scripts (or bash or Perl scripts) from Java using Runtime or ProcessBuilder and pass output back to Java:

Running a bash shell script in java

Running Command Line in Java

java runtime.getruntime() getting output from executing a command line program

Invalid application of sizeof to incomplete type with a struct

Your error is also shown when trying to access the sizeof() of an non-initialized extern array:

extern int a[];
sizeof(a);
>> error: invalid application of 'sizeof' to incomplete type 'int[]'

Note that you would get an array size missing error without the extern keyword.

IntelliJ IDEA "cannot resolve symbol" and "cannot resolve method"

I was facing the same problem when import projects into IntelliJ.

for in my case first, check SDK details and check you have configured JDK correctly or not.

Go to File-> Project Structure-> platform Settings-> SDKs

Check your JDK is correct or not.

enter image description here

Next, I Removed project from IntelliJ and delete all IntelliJ and IDE related files and folder from the project folder (.idea, .settings, .classpath, dependency-reduced-pom). Also, delete the target folder and re-import the project.

The above solution worked in my case.

How to create a toggle button in Bootstrap

I've been trying to activate 'active' class manually with javascript. It's not as usable as a complete library, but for easy cases seems to be enough:

var button = $('#myToggleButton');
button.on('click', function () {
  $(this).toggleClass('active');
});

If you think carefully, 'active' class is used by bootstrap when the button is being pressed, not before or after that (our case), so there's no conflict in reuse the same class.

Try this example and tell me if it fails: http://jsbin.com/oYoSALI/1/edit?html,js,output

How to test enum types?

Usually I would say it is overkill, but there are occasionally reasons for writing unit tests for enums.

Sometimes the values assigned to enumeration members must never change or the loading of legacy persisted data will fail. Similarly, apparently unused members must not be deleted. Unit tests can be used to guard against a developer making changes without realising the implications.

How to check if a variable is both null and /or undefined in JavaScript

You can wrap it in your own function:

function isNullAndUndef(variable) {

    return (variable !== null && variable !== undefined);
}

Why can't I reference System.ComponentModel.DataAnnotations?

For .Net Core in Visual Studio 2019 try this. see VS suggestion

It worked for me, hope it'll work for you as well.

Python:Efficient way to check if dictionary is empty or not

Just check the dictionary:

d = {'hello':'world'}
if d:
  print 'not empty'
else:
  print 'empty'

d = {}
if d:
  print 'not empty'
else:
  print 'empty'

How to find Control in TemplateField of GridView?

I have done it accessing the controls inside the cell control. Find in all control collections.

 ControlCollection cc = (ControlCollection)e.Row.Controls[1].Controls;

 Label lbCod = (Label)cc[1];

Preferred Java way to ping an HTTP URL for availability

here the writer suggests this:

public boolean isOnline() {
    Runtime runtime = Runtime.getRuntime();
    try {
        Process ipProcess = runtime.exec("/system/bin/ping -c 1 8.8.8.8");
        int     exitValue = ipProcess.waitFor();
        return (exitValue == 0);
    } catch (IOException | InterruptedException e) { e.printStackTrace(); }
    return false;
}

Possible Questions

  • Is this really fast enough?Yes, very fast!
  • Couldn’t I just ping my own page, which I want to request anyways? Sure! You could even check both, if you want to differentiate between “internet connection available” and your own servers beeing reachable What if the DNS is down? Google DNS (e.g. 8.8.8.8) is the largest public DNS service in the world. As of 2013 it serves 130 billion requests a day. Let ‘s just say, your app not responding would probably not be the talk of the day.

read the link. its seems very good

EDIT: in my exp of using it, it's not as fast as this method:

public boolean isOnline() {
    NetworkInfo netInfo = connectivityManager.getActiveNetworkInfo();
    return netInfo != null && netInfo.isConnectedOrConnecting();
}

they are a bit different but in the functionality for just checking the connection to internet the first method may become slow due to the connection variables.

Invalid column name sql error

Change this line:

cmd.CommandText = "INSERT INTO Data (Name,PhoneNo,Address) VALUES (" + txtName.Text + "," + txtPhone.Text + "," + txtAddress.Text + ");";

to this:

cmd.CommandText = "INSERT INTO Data (Name,PhoneNo,Address) VALUES ('" + txtName.Text + "','" + txtPhone.Text + "','" + txtAddress.Text + "');";

Your insert command is expecting text, and you need single quotes (') between the actual value so SQL can understand it as text.

EDIT: For those of you who aren't happy with this answer, I would like to point out that there is an issue with this code in regards to SQL Injection. When I answered this question I only considered the question in point which was the missing single-quote on his code and I pointed out how to fix it. A much better answer has been posted by Adam (and I voted for it), where he explains the issues with injection and shows a way to prevent. Now relax and be happy guys.

How to check a channel is closed or not without reading it?

it's easier to check first if the channel has elements, that would ensure the channel is alive.

func isChanClosed(ch chan interface{}) bool {
    if len(ch) == 0 {
        select {
        case _, ok := <-ch:
            return !ok
        }
    }
    return false 
}

How to insert a new line in Linux shell script?

Use this echo statement

 echo -e "Hai\nHello\nTesting\n"

The output is

Hai
Hello
Testing

Entity Framework code-first: migration fails with update-database, forces unneccessary(?) add-migration

Try this:

PM> Enable-migrations -force
PM> Add-migration MigrationName
PM> Update-database -force

Creating for loop until list.length

I'd try to search for the solution by google and the string Python for statement, it is as simple as that. The first link says everything. (A great forum, really, but its usage seems to look sometimes like the usage of the Microsoft understanding of all their GUI products' benefits: windows inside, idiots outside.)

How to find the size of a table in SQL?

SQL Server provides a built-in stored procedure that you can run to easily show the size of a table, including the size of the indexes

sp_spaceused ‘Tablename’

How to implement an STL-style iterator and avoid common pitfalls?

http://www.cplusplus.com/reference/std/iterator/ has a handy chart that details the specs of § 24.2.2 of the C++11 standard. Basically, the iterators have tags that describe the valid operations, and the tags have a hierarchy. Below is purely symbolic, these classes don't actually exist as such.

iterator {
    iterator(const iterator&);
    ~iterator();
    iterator& operator=(const iterator&);
    iterator& operator++(); //prefix increment
    reference operator*() const;
    friend void swap(iterator& lhs, iterator& rhs); //C++11 I think
};

input_iterator : public virtual iterator {
    iterator operator++(int); //postfix increment
    value_type operator*() const;
    pointer operator->() const;
    friend bool operator==(const iterator&, const iterator&);
    friend bool operator!=(const iterator&, const iterator&); 
};
//once an input iterator has been dereferenced, it is 
//undefined to dereference one before that.

output_iterator : public virtual iterator {
    reference operator*() const;
    iterator operator++(int); //postfix increment
};
//dereferences may only be on the left side of an assignment
//once an output iterator has been dereferenced, it is 
//undefined to dereference one before that.

forward_iterator : input_iterator, output_iterator {
    forward_iterator();
};
//multiple passes allowed

bidirectional_iterator : forward_iterator {
    iterator& operator--(); //prefix decrement
    iterator operator--(int); //postfix decrement
};

random_access_iterator : bidirectional_iterator {
    friend bool operator<(const iterator&, const iterator&);
    friend bool operator>(const iterator&, const iterator&);
    friend bool operator<=(const iterator&, const iterator&);
    friend bool operator>=(const iterator&, const iterator&);

    iterator& operator+=(size_type);
    friend iterator operator+(const iterator&, size_type);
    friend iterator operator+(size_type, const iterator&);
    iterator& operator-=(size_type);  
    friend iterator operator-(const iterator&, size_type);
    friend difference_type operator-(iterator, iterator);

    reference operator[](size_type) const;
};

contiguous_iterator : random_access_iterator { //C++17
}; //elements are stored contiguously in memory.

You can either specialize std::iterator_traits<youriterator>, or put the same typedefs in the iterator itself, or inherit from std::iterator (which has these typedefs). I prefer the second option, to avoid changing things in the std namespace, and for readability, but most people inherit from std::iterator.

struct std::iterator_traits<youriterator> {        
    typedef ???? difference_type; //almost always ptrdiff_t
    typedef ???? value_type; //almost always T
    typedef ???? reference; //almost always T& or const T&
    typedef ???? pointer; //almost always T* or const T*
    typedef ???? iterator_category;  //usually std::forward_iterator_tag or similar
};

Note the iterator_category should be one of std::input_iterator_tag, std::output_iterator_tag, std::forward_iterator_tag, std::bidirectional_iterator_tag, or std::random_access_iterator_tag, depending on which requirements your iterator satisfies. Depending on your iterator, you may choose to specialize std::next, std::prev, std::advance, and std::distance as well, but this is rarely needed. In extremely rare cases you may wish to specialize std::begin and std::end.

Your container should probably also have a const_iterator, which is a (possibly mutable) iterator to constant data that is similar to your iterator except it should be implicitly constructable from a iterator and users should be unable to modify the data. It is common for its internal pointer to be a pointer to non-constant data, and have iterator inherit from const_iterator so as to minimize code duplication.

My post at Writing your own STL Container has a more complete container/iterator prototype.

How to install MySQLi on MacOS

Use php-mysqlnd instead of php-mysql. On Linux, to install with apt-get type:

apt-get install php-mysqlnd

How to find out the MySQL root password

The default password which worked for me after immediate installation of mysql server is : mysql

Determine on iPhone if user has enabled push notifications

Unfortunately none of these solutions provided really solve the problem because at the end of the day the APIs are seriously lacking when it comes to providing the pertinent information. You can make a few guesses however using currentUserNotificationSettings (iOS8+) just isn't sufficient in its current form to really answer the question. Although a lot of the solutions here seem to suggest that either that or isRegisteredForRemoteNotifications is more of a definitive answer it really is not.

Consider this:

with isRegisteredForRemoteNotifications documentation states:

Returns YES if the application is currently registered for remote notifications, taking into account any systemwide settings...

However if you throw a simply NSLog into your app delegate to observe the behavior it is clear this does not behave the way we are anticipating it will work. It actually pertains directly to remote notifications having been activated for this app/device. Once activated for the first time this will always return YES. Even turning them off in settings (notifications) will still result in this returning YES this is because, as of iOS8, an app may register for remote notifications and even send to a device without the user having notifications enabled, they just may not do Alerts, Badges and Sound without the user turning that on. Silent notifications are a good example of something you may continue to do even with notifications turned off.

As far as currentUserNotificationSettings it indicates one of four things:

Alerts are on Badges are on Sound is on None are on.

This gives you absolutely no indication whatsoever about the other factors or the Notification switch itself.

A user may in fact turn off badges, sound and alerts but still have show on lockscreen or in notification center. This user should still be receiving push notifications and be able to see them both on the lock screen and in the notification center. They have the notification switch on. BUT currentUserNotificationSettings will return: UIUserNotificationTypeNone in that case. This is not truly indicative of the users actual settings.

A few guesses one can make:

  • if isRegisteredForRemoteNotifications is NO then you can assume that this device has never successfully registered for remote notifications.
  • after the first time of registering for remote notifications a callback to application:didRegisterUserNotificationSettings: is made containing user notification settings at this time since this is the first time a user has been registered the settings should indicate what the user selected in terms of the permission request. If the settings equate to anything other than: UIUserNotificationTypeNone then push permission was granted, otherwise it was declined. The reason for this is that from the moment you begin the remote registration process the user only has the ability to accept or decline, with the initial settings of an acceptance being the settings you setup during the registration process.

how to customise input field width in bootstrap 3

In Bootstrap 3, .form-control (the class you give your inputs) has a width of 100%, which allows you to wrap them into col-lg-X divs for arrangement. Example from the docs:

<div class="row">
  <div class="col-lg-2">
    <input type="text" class="form-control" placeholder=".col-lg-2">
  </div>
  <div class="col-lg-3">
    <input type="text" class="form-control" placeholder=".col-lg-3">
  </div>
  <div class="col-lg-4">
    <input type="text" class="form-control" placeholder=".col-lg-4">
  </div>
</div>

See under Column sizing.

It's a bit different than in Bootstrap 2.3.2, but you get used to it quickly.

Difference between Eclipse Europa, Helios, Galileo

The Eclipse (software) page on Wikipedia summarizes it pretty well:

Releases

Since 2006, the Eclipse Foundation has coordinated an annual Simultaneous Release. Each release includes the Eclipse Platform as well as a number of other Eclipse projects. Until the Galileo release, releases were named after the moons of the solar system.

So far, each Simultaneous Release has occurred at the end of June.

Release         Main Release   Platform version      Projects
Photon          27 June 2018     4.8
Oxygen          28 June 2017     4.7                 
Neon            22 June 2016     4.6                 
Mars            24 June 2015     4.5                 Mars Projects
Luna            25 June 2014     4.4                 Luna Projects
Kepler          26 June 2013     4.3                 Kepler Projects
Juno            27 June 2012     4.2                 Juno Projects
Indigo          22 June 2011     3.7                 Indigo projects
Helios          23 June 2010     3.6                 Helios projects
Galileo         24 June 2009     3.5                 Galileo projects
Ganymede        25 June 2008     3.4                 Ganymede projects
Europa          29 June 2007     3.3                 Europa projects
Callisto        30 June 2006     3.2                 Callisto projects
Eclipse 3.1     28 June 2005     3.1  
Eclipse 3.0     28 June 2004     3.0  

To summarize, Helios, Galileo, Ganymede, etc are just code names for versions of the Eclipse platform (personally, I'd prefer Eclipse to use traditional version numbers instead of code names, it would make things clearer and easier). My suggestion would be to use the latest version, i.e. Eclipse Oxygen (4.7) (in the original version of this answer, it said "Helios (3.6.1)").

On top of the "platform", Eclipse then distributes various Packages (i.e. the "platform" with a default set of plugins to achieve specialized tasks), such as Eclipse IDE for Java Developers, Eclipse IDE for Java EE Developers, Eclipse IDE for C/C++ Developers, etc (see this link for a comparison of their content).

To develop Java Desktop applications, the Helios release of Eclipse IDE for Java Developers should suffice (you can always install "additional plugins" if required).

How do I query between two dates using MySQL?

Just Cast date_field as date

SELECT * FROM `objects` 
WHERE (cast(date_field as date) BETWEEN '2010-09-29' AND 
'2010-01-30' )

CSV API for Java

Reading CSV format description makes me feel that using 3rd party library would be less headache than writing it myself:

Wikipedia lists 10 or something known libraries:

I compared libs listed using some kind of check list. OpenCSV turned out a winner to me (YMMV) with the following results:

+ maven

+ maven - release version   // had some cryptic issues at _Hudson_ with snapshot references => prefer to be on a safe side

+ code examples

+ open source   // as in "can hack myself if needed"

+ understandable javadoc   // as opposed to eg javadocs of _genjava gj-csv_

+ compact API   // YAGNI (note *flatpack* seems to have much richer API than OpenCSV)

- reference to specification used   // I really like it when people can explain what they're doing

- reference to _RFC 4180_ support   // would qualify as simplest form of specification to me

- releases changelog   // absence is quite a pity, given how simple it'd be to get with maven-changes-plugin   // _flatpack_, for comparison, has quite helpful changelog

+ bug tracking

+ active   // as in "can submit a bug and expect a fixed release soon"

+ positive feedback   // Recommended By 51 users at sourceforge (as of now)

How do I get the name of the current executable in C#?

System.Reflection.Assembly.GetExecutingAssembly().ManifestModule.Name;

will give you FileName of your app like; "MyApplication.exe"

Failed to find target with hash string 'android-25'

You can open the SDK standalone by going to installation directory, just right click on the SDK Manager.exe and click on run as Administrator. i hope it will help.

How to check if a string contains a substring in Bash

stringContain variants (compatible or case independent)

As these Stack Overflow answers tell mostly about Bash, I've posted a case independent Bash function at the very bottom of this post...

Anyway, there is my

Compatible answer

As there are already a lot of answers using Bash-specific features, there is a way working under poorer-featured shells, like BusyBox:

[ -z "${string##*$reqsubstr*}" ]

In practice, this could give:

string='echo "My string"'
for reqsubstr in 'o "M' 'alt' 'str';do
  if [ -z "${string##*$reqsubstr*}" ] ;then
      echo "String '$string' contain substring: '$reqsubstr'."
    else
      echo "String '$string' don't contain substring: '$reqsubstr'."
    fi
  done

This was tested under Bash, Dash, KornShell (ksh) and ash (BusyBox), and the result is always:

String 'echo "My string"' contain substring: 'o "M'.
String 'echo "My string"' don't contain substring: 'alt'.
String 'echo "My string"' contain substring: 'str'.

Into one function

As asked by @EeroAaltonen here is a version of the same demo, tested under the same shells:

myfunc() {
    reqsubstr="$1"
    shift
    string="$@"
    if [ -z "${string##*$reqsubstr*}" ] ;then
        echo "String '$string' contain substring: '$reqsubstr'.";
      else
        echo "String '$string' don't contain substring: '$reqsubstr'."
    fi
}

Then:

$ myfunc 'o "M' 'echo "My String"'
String 'echo "My String"' contain substring 'o "M'.

$ myfunc 'alt' 'echo "My String"'
String 'echo "My String"' don't contain substring 'alt'.

Notice: you have to escape or double enclose quotes and/or double quotes:

$ myfunc 'o "M' echo "My String"
String 'echo My String' don't contain substring: 'o "M'.

$ myfunc 'o "M' echo \"My String\"
String 'echo "My String"' contain substring: 'o "M'.

Simple function

This was tested under BusyBox, Dash, and, of course Bash:

stringContain() { [ -z "${2##*$1*}" ]; }

Then now:

$ if stringContain 'o "M3' 'echo "My String"';then echo yes;else echo no;fi
no
$ if stringContain 'o "M' 'echo "My String"';then echo yes;else echo no;fi
yes

... Or if the submitted string could be empty, as pointed out by @Sjlver, the function would become:

stringContain() { [ -z "${2##*$1*}" ] && [ -z "$1" -o -n "$2" ]; }

or as suggested by Adrian Günter's comment, avoiding -o switches:

stringContain() { [ -z "${2##*$1*}" ] && { [ -z "$1" ] || [ -n "$2" ];};}

Final (simple) function:

And inverting the tests to make them potentially quicker:

stringContain() { [ -z "$1" ] || { [ -z "${2##*$1*}" ] && [ -n "$2" ];};}

With empty strings:

$ if stringContain '' ''; then echo yes; else echo no; fi
yes
$ if stringContain 'o "M' ''; then echo yes; else echo no; fi
no

Case independent (Bash only!)

For testing strings without care of case, simply convert each string to lower case:

stringContain() {
    local _lc=${2,,}
    [ -z "$1" ] || { [ -z "${_lc##*${1,,}*}" ] && [ -n "$2" ] ;} ;}

Check:

stringContain 'o "M3' 'echo "my string"' && echo yes || echo no
no
stringContain 'o "My' 'echo "my string"' && echo yes || echo no
yes
if stringContain '' ''; then echo yes; else echo no; fi
yes
if stringContain 'o "M' ''; then echo yes; else echo no; fi
no

ActiveRecord: size vs count

The following strategies all make a call to the database to perform a COUNT(*) query.

Model.count

Model.all.size

records = Model.all
records.count

The following is not as efficient as it will load all records from the database into Ruby, which then counts the size of the collection.

records = Model.all
records.size

If your models have associations and you want to find the number of belonging objects (e.g. @customer.orders.size), you can avoid database queries (disk reads). Use a counter cache and Rails will keep the cache value up to date, and return that value in response to the size method.

app-release-unsigned.apk is not signed

If anyone wants to debug release build using Android Studio, follow these steps:

  1. Set build variant to release mode.

enter image description here

  1. Right click on app in left navigation pane, click Open Module Settings.

  2. Go to Signing Tab. Add a signing config and fill in information. Select your keychain as well.

enter image description here

  1. Go to Build Type tab. Select release mode and set:

-Debuggable to true.

-Signing Config to the config. (The one you just created).

enter image description here

Sync your gradle. Enjoy!

Specifing width of a flexbox flex item: width or basis?

The bottom statement is equivalent to:

.half {
   flex-grow: 0;
   flex-shrink: 0;
   flex-basis: 50%;
}

Which, in this case, would be equivalent as the box is not allowed to flex and therefore retains the initial width set by flex-basis.

Flex-basis defines the default size of an element before the remaining space is distributed so if the element were allowed to flex (grow/shrink) it may not be 50% of the width of the page.

I've found that I regularly return to https://css-tricks.com/snippets/css/a-guide-to-flexbox/ for help regarding flexbox :)

How to install a python library manually

You need to install it in a directory in your home folder, and somehow manipulate the PYTHONPATH so that directory is included.

The best and easiest is to use virtualenv. But that requires installation, causing a catch 22. :) But check if virtualenv is installed. If it is installed you can do this:

$ cd /tmp
$ virtualenv foo
$ cd foo
$ ./bin/python

Then you can just run the installation as usual, with /tmp/foo/python setup.py install. (Obviously you need to make the virtual environment in your a folder in your home directory, not in /tmp/foo. ;) )

If there is no virtualenv, you can install your own local Python. But that may not be allowed either. Then you can install the package in a local directory for packages:

$ wget http://pypi.python.org/packages/source/s/six/six-1.0b1.tar.gz#md5=cbfcc64af1f27162a6a6b5510e262c9d
$ tar xvf six-1.0b1.tar.gz 
$ cd six-1.0b1/
$ pythonX.X setup.py   install --install-dir=/tmp/frotz

Now you need to add /tmp/frotz/pythonX.X/site-packages to your PYTHONPATH, and you should be up and running!

Failed to load c++ bson extension

The bson extension message is just a warning, I get it all the time in my nodejs application.

Things to check:

  • MongoDB instance: Do you have a MongoDB instance running?
  • Config: Did you correctly configure Mongoose to your MongoDB instance? I suspect your config is wrong, because the error message spits out a very weird string for your mongodb server host name..

matplotlib savefig in jpeg format

You can save an image as 'png' and use the python imaging library (PIL) to convert this file to 'jpg':

import Image
import matplotlib.pyplot as plt

plt.plot(range(10))
plt.savefig('testplot.png')
Image.open('testplot.png').save('testplot.jpg','JPEG')

The original:

enter image description here

The JPEG image:

enter image description here

How / can I display a console window in Intellij IDEA?

IntelliJ IDEA 14 & 15 & 2017:

View > Tool Windows > Terminal

or

Alt + F12

enter image description here enter image description here

How to query SOLR for empty fields?

You can also use it like this.

fq=!id:['' TO *]

Python memory usage of numpy arrays

In python notebooks I often want to filter out 'dangling' numpy.ndarray's, in particular the ones that are stored in _1, _2, etc that were never really meant to stay alive.

I use this code to get a listing of all of them and their size.

Not sure if locals() or globals() is better here.

import sys
import numpy
from humanize import naturalsize

for size, name in sorted(
    (value.nbytes, name)
    for name, value in locals().items()
    if isinstance(value, numpy.ndarray)):
  print("{:>30}: {:>8}".format(name, naturalsize(size)))

WaitAll vs WhenAll

As an example of the difference -- if you have a task the does something with the UI thread (e.g. a task that represents an animation in a Storyboard) if you Task.WaitAll() then the UI thread is blocked and the UI is never updated. if you use await Task.WhenAll() then the UI thread is not blocked, and the UI will be updated.

How to check Elasticsearch cluster health?

To check on elasticsearch cluster health you need to use

curl localhost:9200/_cat/health

More on the cat APIs here.

I usually use elasticsearch-head plugin to visualize that.

You can find it's github project here.

It's easy to install sudo $ES_HOME/bin/plugin -i mobz/elasticsearch-head and then you can open localhost:9200/_plugin/head/ in your web brower.

You should have something that looks like this :

enter image description here

Database design for a survey

Having a large Answer table, in and of itself, is not a problem. As long as the indexes and constraints are well defined you should be fine. Your second schema looks good to me.

100% width Twitter Bootstrap 3 template

You're right using div.container-fluid and you also need a div.row child. Then, the content must be placed inside without any grid columns. If you have a look at the docs you can find this text:

  • Rows must be placed within a .container (fixed-width) or .container-fluid (full-width) for proper alignment and padding.
  • Use rows to create horizontal groups of columns.

Not using grid columns it's ok as stated here:

  • Content should be placed within columns, and only columns may be immediate children of rows.

And looking at this example, you can read this text:

Full width, single column: No grid classes are necessary for full-width elements.

Here's a live example showing some elements using the correct layout. This way you don't need any custom CSS or hack.

Adding iOS UITableView HeaderView (not section header)

UITableView has a tableHeaderView property. Set that to whatever view you want up there.

Use a new UIView as a container, add a text label and an image view to that new UIView, then set tableHeaderView to the new view.

For example, in a UITableViewController:

-(void)viewDidLoad
{
     // ...
     UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(XXX, YYY, XXX, YYY)];
     UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(XXX, YYY, XXX, YYY)];
     [headerView addSubview:imageView];
     UILabel *labelView = [[UILabel alloc] initWithFrame:CGRectMake(XXX, YYY, XXX, YYY)];
     [headerView addSubview:labelView];
     self.tableView.tableHeaderView = headerView;
     [imageView release];
     [labelView release];
     [headerView release];
     // ...
} 

What certificates are trusted in truststore?

Trust store generally (actually should only contain root CAs but this rule is violated in general) contains the certificates that of the root CAs (public CAs or private CAs). You can verify the list of certs in trust store using

keytool -list -v -keystore truststore.jks

How can I install the VS2017 version of msbuild on a build server without installing the IDE?

The Visual Studio Build tools are a different download than the IDE. They appear to be a pretty small subset, and they're called Build Tools for Visual Studio 2019 (download).

You can use the GUI to do the installation, or you can script the installation of msbuild:

vs_buildtools.exe --add Microsoft.VisualStudio.Workload.MSBuildTools --quiet

Microsoft.VisualStudio.Workload.MSBuildTools is a "wrapper" ID for the three subcomponents you need:

  • Microsoft.Component.MSBuild
  • Microsoft.VisualStudio.Component.CoreBuildTools
  • Microsoft.VisualStudio.Component.Roslyn.Compiler

You can find documentation about the other available CLI switches here.

The build tools installation is much quicker than the full IDE. In my test, it took 5-10 seconds. With --quiet there is no progress indicator other than a brief cursor change. If the installation was successful, you should be able to see the build tools in %programfiles(x86)%\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin.

If you don't see them there, try running without --quiet to see any error messages that may occur during installation.

Parsing XML in Python using ElementTree example

If I understand your question correctly:

for elem in doc.findall('timeSeries/values/value'):
    print elem.get('dateTime'), elem.text

or if you prefer (and if there is only one occurrence of timeSeries/values:

values = doc.find('timeSeries/values')
for value in values:
    print value.get('dateTime'), elem.text

The findall() method returns a list of all matching elements, whereas find() returns only the first matching element. The first example loops over all the found elements, the second loops over the child elements of the values element, in this case leading to the same result.

I don't see where the problem with not finding timeSeries comes from however. Maybe you just forgot the getroot() call? (note that you don't really need it because you can work from the elementtree itself too, if you change the path expression to for example /timeSeriesResponse/timeSeries/values or //timeSeries/values)

Ignoring upper case and lower case in Java

I have also tried all the posted code until I found out this one

if(math.toLowerCase(Locale.ENGLISH));

Here whatever character the user input will be converted to lower cases.

Status bar and navigation bar appear over my view's bounds in iOS 7

You can achieve this by implementing a new property called edgesForExtendedLayout in iOS7 SDK. Please add the following code to achieve this,

if ([self respondsToSelector:@selector(edgesForExtendedLayout)])
        self.edgesForExtendedLayout = UIRectEdgeNone;

You need to add the above in your -(void)viewDidLoad method.

iOS 7 brings several changes to how you layout and customize the appearance of your UI. The changes in view-controller layout, tint color, and font affect all the UIKit objects in your app. In addition, enhancements to gesture recognizer APIs give you finer grained control over gesture interactions.

Using View Controllers

In iOS 7, view controllers use full-screen layout. At the same time, iOS 7 gives you more granular control over the way a view controller lays out its views. In particular, the concept of full-screen layout has been refined to let a view controller specify the layout of each edge of its view.

The wantsFullScreenLayout view controller property is deprecated in iOS 7. If you currently specify wantsFullScreenLayout = NO, the view controller may display its content at an unexpected screen location when it runs in iOS 7.

To adjust how a view controller lays out its views, UIViewController provides the following properties:

  • edgesForExtendedLayout

The edgesForExtendedLayout property uses the UIRectEdge type, which specifies each of a rectangle’s four edges, in addition to specifying none and all. Use edgesForExtendedLayout to specify which edges of a view should be extended, regardless of bar translucency. By default, the value of this property is UIRectEdgeAll.

  • extendedLayoutIncludesOpaqueBars

If your design uses opaque bars, refine edgesForExtendedLayout by also setting the extendedLayoutIncludesOpaqueBars property to NO. (The default value of extendedLayoutIncludesOpaqueBars is NO.)

  • automaticallyAdjustsScrollViewInsets

If you don’t want a scroll view’s content insets to be automatically adjusted, set automaticallyAdjustsScrollViewInsets to NO. (The default value of automaticallyAdjustsScrollViewInsets is YES.)

  • topLayoutGuide, bottomLayoutGuide

The topLayoutGuide and bottomLayoutGuide properties indicate the location of the top or bottom bar edges in a view controller’s view. If bars should overlap the top or bottom of a view, you can use Interface Builder to position the view relative to the bar by creating constraints to the bottom of topLayoutGuide or to the top of bottomLayoutGuide. (If no bars should overlap the view, the bottom of topLayoutGuide is the same as the top of the view and the top of bottomLayoutGuide is the same as the bottom of the view.) Both properties are lazily created when requested.

Please refer, apple doc

How to implement onBackPressed() in Fragments?

onBackPressed() cause Fragment to be detach from Activity.

According to @Sterling Diaz answer I think he is right. BUT some situation will be wrong. (ex. Rotate Screen)

So, I think we could detect whether isRemoving() to achieve goals.

You can write it at onDetach() or onDestroyView(). It is work.

@Override
public void onDetach() {
    super.onDetach();
    if(isRemoving()){
        // onBackPressed()
    }
}

@Override
public void onDestroyView() {
    super.onDestroyView();
    if(isRemoving()){
        // onBackPressed()
    }
}

Validate phone number using javascript

Can any one explain why??

This happening because your regular expression doesn't end with any anchor meta-character such as the end of line $ or a word boundary \b.

So when you ask the regex engine whether 123-345-34567 is valid phone number it will try to find a match within this string, so it matches 123- with this part (\([0-9]{3}\) |[0-9]{3}-) then it matches 345- with this part [0-9]{3}- then it matches 3456 with this part [0-9]{4}.

Now the engine finds that it has walked the entire regex and found a string inside your input that matches the regex although a character was left - the number 7- in the input string, so it stops and returns success because it found a sub-string that matches.

If you had included $ or \b at the end of your regex, the engine walks the same way as before then it tries to match $ or \b but finds the last number - the 7 - and it is not a word boundary \b nor a an end of line $ so it stops and fails to find a match.

How to read until EOF from cin in C++

You can do it without explicit loops by using stream iterators. I'm sure that it uses some kind of loop internally.

#include <string>
#include <iostream>
#include <istream>
#include <ostream>
#include <iterator>

int main()
{
// don't skip the whitespace while reading
  std::cin >> std::noskipws;

// use stream iterators to copy the stream to a string
  std::istream_iterator<char> it(std::cin);
  std::istream_iterator<char> end;
  std::string results(it, end);

  std::cout << results;
}

Installing a specific version of angular with angular cli

npx @angular/cli@10 new my-poject

you can replace 10 with your version of choice... no need to uninstall your existing CLI! Just learnt that now...

Trying to fire the onload event on script tag

I faced a similar problem, trying to test if jQuery is already present on a page, and if not force it's load, and then execute a function. I tried with @David Hellsing workaround, but with no chance for my needs. In fact, the onload instruction was immediately evaluated, and then the $ usage inside this function was not yet possible (yes, the huggly "$ is not a function." ^^).

So, I referred to this article : https://developer.mozilla.org/fr/docs/Web/Events/load and attached a event listener to my script object.

var script = document.createElement('script');
script.type = "text/javascript";
script.addEventListener("load", function(event) {
    console.log("script loaded :)");
    onjqloaded();
});
script.src = "https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js";
document.getElementsByTagName('head')[0].appendChild(script);

For my needs, it works fine now. Hope this can help others :)

Cross-Origin Request Blocked

You have to placed this code in application.rb

config.action_dispatch.default_headers = {
        'Access-Control-Allow-Origin' => '*',
        'Access-Control-Request-Method' => %w{GET POST OPTIONS}.join(",")
}

The response content cannot be parsed because the Internet Explorer engine is not available, or

To make it work without modifying your scripts:

I found a solution here: http://wahlnetwork.com/2015/11/17/solving-the-first-launch-configuration-error-with-powershells-invoke-webrequest-cmdlet/

The error is probably coming up because IE has not yet been launched for the first time, bringing up the window below. Launch it and get through that screen, and then the error message will not come up any more. No need to modify any scripts.

ie first launch window

How do I populate a JComboBox with an ArrayList?

By combining existing answers (this one and this one) the proper type safe way to add an ArrayList to a JComboBox is the following:

private DefaultComboBoxModel<YourClass> getComboBoxModel(List<YourClass> yourClassList)
{
    YourClass[] comboBoxModel = yourClassList.toArray(new YourClass[0]);
    return new DefaultComboBoxModel<>(comboBoxModel);
}

In your GUI code you set the entire list into your JComboBox as follows:

DefaultComboBoxModel<YourClass> comboBoxModel = getComboBoxModel(yourClassList);
comboBox.setModel(comboBoxModel);

Why extend the Android Application class?

Not an answer but an observation: keep in mind that the data in the extended application object should not be tied to an instance of an activity, as it is possible that you have two instances of the same activity running at the same time (one in the foreground and one not being visible).

For example, you start your activity normally through the launcher, then "minimize" it. You then start another app (ie Tasker) which starts another instance of your activitiy, for example in order to create a shortcut, because your app supports android.intent.action.CREATE_SHORTCUT. If the shortcut is then created and this shortcut-creating invocation of the activity modified the data the application object, then the activity running in the background will start to use this modified application object once it is brought back to the foreground.

self referential struct definition?

Clearly a Cell cannot contain another cell as it becomes a never-ending recursion.

However a Cell CAN contain a pointer to another cell.

typedef struct Cell {
  bool isParent;
  struct Cell* child;
} Cell;

Multiple conditions in WHILE loop

You need to change || to && so that both conditions must be true to enter the loop.

while(myChar != 'n' && myChar != 'N')

JavaScript listener, "keypress" doesn't detect backspace?

The keypress event might be different across browsers.

I created a Jsfiddle to compare keyboard events (using the JQuery shortcuts) on Chrome and Firefox. Depending on the browser you're using a keypress event will be triggered or not -- backspace will trigger keydown/keypress/keyup on Firefox but only keydown/keyup on Chrome.

Single keyclick events triggered

on Chrome

  • keydown/keypress/keyup when browser registers a keyboard input (keypress is fired)

  • keydown/keyup if no keyboard input (tested with alt, shift, backspace, arrow keys)

  • keydown only for tab?

on Firefox

  • keydown/keypress/keyup when browser registers a keyboard input but also for backspace, arrow keys, tab (so here keypress is fired even with no input)

  • keydown/keyup for alt, shift


This shouldn't be surprising because according to https://api.jquery.com/keypress/:

Note: as the keypress event isn't covered by any official specification, the actual behavior encountered when using it may differ across browsers, browser versions, and platforms.

The use of the keypress event type is deprecated by W3C (http://www.w3.org/TR/DOM-Level-3-Events/#event-type-keypress)

The keypress event type is defined in this specification for reference and completeness, but this specification deprecates the use of this event type. When in editing contexts, authors can subscribe to the beforeinput event instead.


Finally, to answer your question, you should use keyup or keydown to detect a backspace across Firefox and Chrome.


Try it out on here:

_x000D_
_x000D_
$(".inputTxt").bind("keypress keyup keydown", function (event) {_x000D_
    var evtType = event.type;_x000D_
    var eWhich = event.which;_x000D_
    var echarCode = event.charCode;_x000D_
    var ekeyCode = event.keyCode;_x000D_
_x000D_
    switch (evtType) {_x000D_
        case 'keypress':_x000D_
            $("#log").html($("#log").html() + "<b>" + evtType + "</b>" + " keycode: " + ekeyCode + " charcode: " + echarCode + " which: " + eWhich + "<br>");_x000D_
            break;_x000D_
        case 'keyup':_x000D_
            $("#log").html($("#log").html() + "<b>" + evtType + "</b>" + " keycode: " + ekeyCode + " charcode: " + echarCode + " which: " + eWhich + "<p>");_x000D_
            break;_x000D_
        case 'keydown':_x000D_
            $("#log").html($("#log").html() + "<b>" + evtType + "</b>" + " keycode: " + ekeyCode + " charcode: " + echarCode + " which: " + eWhich + "<br>");_x000D_
            break;_x000D_
        default:_x000D_
            break;_x000D_
    }_x000D_
});
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>_x000D_
<input class="inputTxt" type="text" />_x000D_
<div id="log"></div>
_x000D_
_x000D_
_x000D_

How to strip HTML tags from a string in SQL Server?

There is a UDF that will do that described here:

User Defined Function to Strip HTML

CREATE FUNCTION [dbo].[udf_StripHTML] (@HTMLText VARCHAR(MAX))
RETURNS VARCHAR(MAX) AS
BEGIN
    DECLARE @Start INT
    DECLARE @End INT
    DECLARE @Length INT
    SET @Start = CHARINDEX('<',@HTMLText)
    SET @End = CHARINDEX('>',@HTMLText,CHARINDEX('<',@HTMLText))
    SET @Length = (@End - @Start) + 1
    WHILE @Start > 0 AND @End > 0 AND @Length > 0
    BEGIN
        SET @HTMLText = STUFF(@HTMLText,@Start,@Length,'')
        SET @Start = CHARINDEX('<',@HTMLText)
        SET @End = CHARINDEX('>',@HTMLText,CHARINDEX('<',@HTMLText))
        SET @Length = (@End - @Start) + 1
    END
    RETURN LTRIM(RTRIM(@HTMLText))
END
GO

Edit: note this is for SQL Server 2005, but if you change the keyword MAX to something like 4000, it will work in SQL Server 2000 as well.

How to negate code in "if" statement block in JavaScript -JQuery like 'if not then..'

Try negation operator ! before $(this):

if (!$(this).parent().next().is('ul')){

jQuery if statement to check visibility

Yes you can use .is(':visible') in jquery. But while the code is running under the safari browser .is(':visible') is won't work.

So please use the below code

if( $(".example").offset().top > 0 )

The above line will work both IE as well as safari also.

Single Line Nested For Loops

Below code for best examples for nested loops, while using two for loops please remember the output of the first loop is input for the second loop. Loop termination also important while using the nested loops

for x in range(1, 10, 1):
     for y in range(1,x):
             print y,
        print
OutPut :
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8

Logging POST data from $request_body

The solution below was the best format I found.

log_format postdata escape=json '$remote_addr - $remote_user [$time_local] '
                       '"$request" $status $bytes_sent '
                       '"$http_referer" "$http_user_agent" "$request_body"';
server {
        listen 80;

        server_name api.some.com;

        location / {
         access_log  /var/log/nginx/postdata.log  postdata;
         proxy_pass      http://127.0.0.1:8080;
        }

}

For this input

curl -d '{"key1":"value1", "key2":"value2"}' -H "Content-Type: application/json" -X POST http://api.deprod.com/postEndpoint

Generate that great result

201.23.89.149 -  [22/Aug/2019:15:58:40 +0000] "POST /postEndpoint HTTP/1.1" 200 265 "" "curl/7.64.0" "{\"key1\":\"value1\", \"key2\":\"value2\"}"

How to prettyprint a JSON file?

It's far from perfect, but it does the job.

data = data.replace(',"',',\n"')

you can improve it, add indenting and so on, but if you just want to be able to read a cleaner json, this is the way to go.

How to plot multiple functions on the same figure, in Matplotlib?

Perhaps a more pythonic way of doing so.

from numpy import *
import math
import matplotlib.pyplot as plt

t = linspace(0,2*math.pi,400)
a = sin(t)
b = cos(t)
c = a + b

plt.plot(t, a, t, b, t, c)
plt.show()

enter image description here

Java: Best way to iterate through a Collection (here ArrayList)

The first option is better performance wise (As ArrayList implement RandomAccess interface). As per the java doc, a List implementation should implement RandomAccess interface if, for typical instances of the class, this loop:

 for (int i=0, n=list.size(); i < n; i++)
     list.get(i);

runs faster than this loop:

 for (Iterator i=list.iterator(); i.hasNext(); )
     i.next();

I hope it helps. First option would be slow for sequential access lists.

How to insert element as a first child?

$('.parent-div').children(':first').before("<div class='child-div'>some text</div>");

Getting a count of objects in a queryset in django

Another way of doing this would be using Aggregation. You should be able to achieve a similar result using a single query. Such as this:

Item.objects.values("contest").annotate(Count("id"))

I did not test this specific query, but this should output a count of the items for each value in contests as a dictionary.

Can a java lambda have more than 1 parameter?

You could also use jOOL library - https://github.com/jOOQ/jOOL

It has already prepared function interfaces with different number of parameters. For instance, you could use org.jooq.lambda.function.Function3, etc from Function0 up to Function16.

Python Pandas Counting the Occurrences of a Specific value

An elegant way to count the occurrence of '?' or any symbol in any column, is to use built-in function isin of a dataframe object.

Suppose that we have loaded the 'Automobile' dataset into df object. We do not know which columns contain missing value ('?' symbol), so let do:

df.isin(['?']).sum(axis=0)

DataFrame.isin(values) official document says:

it returns boolean DataFrame showing whether each element in the DataFrame is contained in values

Note that isin accepts an iterable as input, thus we need to pass a list containing the target symbol to this function. df.isin(['?']) will return a boolean dataframe as follows.

    symboling   normalized-losses   make    fuel-type   aspiration-ratio ...
0   False       True                False   False       False
1   False       True                False   False       False
2   False       True                False   False       False
3   False       False               False   False       False
4   False       False               False   False       False
5   False       True                False   False       False
...

To count the number of occurrence of the target symbol in each column, let's take sum over all the rows of the above dataframe by indicating axis=0. The final (truncated) result shows what we expect:

symboling             0
normalized-losses    41
...
bore                  4
stroke                4
compression-ratio     0
horsepower            2
peak-rpm              2
city-mpg              0
highway-mpg           0
price                 4

CSS3 transitions inside jQuery .css()

Your code can get messy fast when dealing with CSS3 transitions. I would recommend using a plugin such as jQuery Transit that handles the complexity of CSS3 animations/transitions.

Moreover, the plugin uses webkit-transform rather than webkit-transition, which allows for mobile devices to use hardware acceleration in order to give your web apps that native look and feel when the animations occur.

JS Fiddle Live Demo

Javascript:

$("#startTransition").on("click", function()
{

    if( $(".boxOne").is(":visible")) 
    {
        $(".boxOne").transition({ x: '-100%', opacity: 0.1 }, function () { $(".boxOne").hide(); });
        $(".boxTwo").css({ x: '100%' });
        $(".boxTwo").show().transition({ x: '0%', opacity: 1.0 });
        return;        
    }

    $(".boxTwo").transition({ x: '-100%', opacity: 0.1 }, function () { $(".boxTwo").hide(); });
    $(".boxOne").css({ x: '100%' });
    $(".boxOne").show().transition({ x: '0%', opacity: 1.0 });

});

Most of the hard work of getting cross-browser compatibility is done for you as well and it works like a charm on mobile devices.

What is the difference between the dot (.) operator and -> in C++?

pSomething->someMember

is equivalent to

(*pSomething).someMember

Phone number formatting an EditText in Android

You can use a Regular Expression with pattern matching to extract number from a string.

    String s="";
    Pattern p = Pattern.compile("\\d+");
    Matcher m = p.matcher("(1111)123-456-789"); //editText.getText().toString()                                      
    while (m.find()) {
    s=s+m.group(0);
    }
    System.out.println("............"+s);    

    Output : ............1111123456789

Convert String array to ArrayList

Using Collections#addAll()

String[] words = {"ace","boom","crew","dog","eon"};
List<String> arrayList = new ArrayList<>(); 
Collections.addAll(arrayList, words); 

Adding backslashes without escaping [Python]

>>> '\\&' == '\&'
True
>>> len('\\&')
2
>>> print('\\&')
\&

Or in other words: '\\&' only contains one backslash. It's just escaped in the python shell's output for clarity.

How can I combine two HashMap objects containing the same types?

One-liner using Java 8 Stream API:

map3 = Stream.of(map1, map2).flatMap(m -> m.entrySet().stream())
       .collect(Collectors.toMap(Entry::getKey, Entry::getValue))

Among the benefits of this method is ability to pass a merge function, which will deal with values that have the same key, for example:

map3 = Stream.of(map1, map2).flatMap(m -> m.entrySet().stream())
       .collect(Collectors.toMap(Entry::getKey, Entry::getValue, Math::max))

Omitting the second expression when using the if-else shorthand

What you have is a fairly unusual use of the ternary operator. Usually it is used as an expression, not a statement, inside of some other operation, e.g.:

var y = (x == 2 ? "yes" : "no");

So, for readability (because what you are doing is unusual), and because it avoids the "else" that you don't want, I would suggest:

if (x==2) doSomething();

Partial Dependency (Databases)

  • consider a table={cid,sid,location}
  • candidate key: cidsid (uniquely identify the row)
  • prime attributes: cid and sid (attributes which are used in making of candidate key)
  • non-prime attribute: location(attribute other than candidate key)

if candidate key determine non-prime attribute:

i.e cidsid--->location (---->=determining) 
   then, it is fully functional dependent

if proper subset of candidate key determining non-prime attribute:

 i.e sid--->location (proper subset are sid and cid)
         then it is term as partial dependency

to remove partial dependency we divide the table accordingly .

Undefined reference to 'vtable for xxx'

One or more of your .cpp files is not being linked in, or some non-inline functions in some class are not defined. In particular, takeaway::textualGame()'s implementation can't be found. Note that you've defined a textualGame() at toplevel, but this is distinct from a takeaway::textualGame() implementation - probably you just forgot the takeaway:: there.

What the error means is that the linker can't find the "vtable" for a class - every class with virtual functions has a "vtable" data structure associated with it. In GCC, this vtable is generated in the same .cpp file as the first listed non-inline member of the class; if there's no non-inline members, it will be generated wherever you instantiate the class, I believe. So you're probably failing to link the .cpp file with that first-listed non-inline member, or never defining that member in the first place.

HTTP Request in Swift with POST method

Swift 4 and above

@IBAction func submitAction(sender: UIButton) {

    //declare parameter as a dictionary which contains string as key and value combination. considering inputs are valid

    let parameters = ["id": 13, "name": "jack"]

    //create the url with URL
    let url = URL(string: "www.thisismylink.com/postName.php")! //change the url

    //create the session object
    let session = URLSession.shared

    //now create the URLRequest object using the url object
    var request = URLRequest(url: url)
    request.httpMethod = "POST" //set http method as POST

    do {
        request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted) // pass dictionary to nsdata object and set it as request body
    } catch let error {
        print(error.localizedDescription)
    }

    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")

    //create dataTask using the session object to send data to the server
    let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in

        guard error == nil else {
            return
        }

        guard let data = data else {
            return
        }

        do {
            //create json object from data
            if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
                print(json)
                // handle json...
            }
        } catch let error {
            print(error.localizedDescription)
        }
    })
    task.resume()
}

ASP.NET MVC Bundle not rendering script files on staging server. It works on development server

add to your global file this action.

protected void Application_Start() {
   BundleConfig.RegisterBundles(BundleTable.Bundles);
}

Finding partial text in range, return an index

I just found this when googling to solve the same problem, and had to make a minor change to the solution to make it work in my situation, as I had 2 similar substrings, "Sun" and "Sunstruck" to search for. The offered solution was locating the wrong entry when searching for "Sun". Data in column B

I added another column C, formulaes C1=" "&B1&" " and changed the search to =COUNTIF(B1:B10,"* "&A1&" *")>0, the extra column to allow finding the first of last entry in the concatenated string.

How do I set up access control in SVN?

You can use svn+ssh:, and then it's based on access control to the repository at the given location.

This is how I host a project group repository at my uni, where I can't set up anything else. Just having a directory that the group owns, and running svn-admin (or whatever it was) in there means that I didn't need to do any configuration.

Determine if running on a rooted device

Further to @Kevins answer, I've recently found while using his system, that the Nexus 7.1 was returning false for all three methods - No which command, no test-keys and SuperSU was not installed in /system/app.

I added this:

public static boolean checkRootMethod4(Context context) {
    return isPackageInstalled("eu.chainfire.supersu", context);     
}

private static boolean isPackageInstalled(String packagename, Context context) {
    PackageManager pm = context.getPackageManager();
    try {
        pm.getPackageInfo(packagename, PackageManager.GET_ACTIVITIES);
        return true;
    } catch (NameNotFoundException e) {
        return false;
    }
}

This is slightly less useful in some situations (if you need guaranteed root access) as it's completely possible for SuperSU to be installed on devices which don't have SU access.

However, since it's possible to have SuperSU installed and working but not in the /system/app directory, this extra case will root (haha) out such cases.

How to print GETDATE() in SQL Server with milliseconds in time?

This is equivalent to new Date().getTime() in JavaScript :

Use the below statement to get the time in seconds.

SELECT  cast(DATEDIFF(s, '1970-01-01 00:00:00.000', '2016-12-09 16:22:17.897' ) as bigint)

Use the below statement to get the time in milliseconds.

SELECT  cast(DATEDIFF(s, '1970-01-01 00:00:00.000', '2016-12-09 16:22:17.897' ) as bigint)  * 1000

How to keep a Python script output window open?

Try this,

import sys

stat='idlelib' in sys.modules

if stat==False:
    input()

This will only stop console window, not the IDLE.

'profile name is not valid' error when executing the sp_send_dbmail command

profile name is not valid [SQLSTATE 42000] (Error 14607)

This happened to me after I copied job script from old SQL server to new SQL server. In SSMS, under Management, the Database Mail profile name was different in the new SQL Server. All I had to do was update the name in job script.

Jackson serialization: ignore empty values (or null)

For jackson 2.x

@JsonInclude(JsonInclude.Include.NON_NULL)

just before the field.

Is there an easy way to check the .NET Framework version?

This is the solution I landed on:

private static string GetDotNetVersion()
{
  var v4 = (string)Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full", false)?.GetValue("Version");
  if(v4 != null)
    return v4;
  var v35 = (string)Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5", false)?.GetValue("Version");
  if(v35 != null)
    return v35;
  var v3 = (string)Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.0", false)?.GetValue("Version");
  return v3 ?? "< 3";
}

How to draw a circle with text in the middle?

You can use css3 flexbox.

HTML:

<div class="circle-with-text">
    Here is some text in circle
</div>

CSS:

.circle-with-text {
  justify-content: center;
  align-items: center;
  border-radius: 100%;
  text-align: center;
  display: flex;
}

This will allow you to have vertically and horizontally middle aligned single line and multi-line text.

_x000D_
_x000D_
body {_x000D_
  margin: 0;_x000D_
}_x000D_
.circles {_x000D_
  display: flex;_x000D_
}_x000D_
.circle-with-text {_x000D_
  background: linear-gradient(orange, red);_x000D_
  justify-content: center;_x000D_
  align-items: center;_x000D_
  border-radius: 100%;_x000D_
  text-align: center;_x000D_
  margin: 5px 20px;_x000D_
  font-size: 15px;_x000D_
  padding: 15px;_x000D_
  display: flex;_x000D_
  height: 180px;_x000D_
  width: 180px;_x000D_
  color: #fff;_x000D_
}_x000D_
.multi-line-text {_x000D_
  font-size: 20px;_x000D_
}
_x000D_
<div class="circles">_x000D_
  <div class="circle-with-text">_x000D_
    Here is some text in circle_x000D_
  </div>_x000D_
  <div class="circle-with-text multi-line-text">_x000D_
    Here is some multi-line text in circle_x000D_
  </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

How to embed new Youtube's live video permanent URL?

The issue is two-fold:

  1. WordPress reformats the YouTube link
  2. You need a custom embed link to support a live stream embed

As a prerequisite (as of August, 2016), you need to link an AdSense account and then turn on monetization in your YouTube channel. It's a painful change that broke a lot of live streams.

You will need to use the following URL format for the embed:

<iframe width="560" height="315" src="https://www.youtube.com/embed/live_stream?channel=CHANNEL_ID&autoplay=1" frameborder="0" allowfullscreen></iframe>

The &autoplay=1 is not necessary, but I like to include it. Change CHANNEL to your channel's ID. One thing to note is that WordPress may reformat the URL once you commit your change. Therefore, you'll need a plugin that allows you to use raw code and not have it override. Using a custom PHP code plugin can help and you would just echo the code like so:

<?php echo '<iframe width="560" height="315" src="https://www.youtube.com/embed/live_stream?channel=CHANNEL_ID&autoplay=1" frameborder="0" allowfullscreen></iframe>'; ?>

Let me know if that worked for you!

CSS: Set Div height to 100% - Pixels

_x000D_
_x000D_
div{_x000D_
  height:100vh;_x000D_
}
_x000D_
<div></div>
_x000D_
_x000D_
_x000D_

What is the theoretical maximum number of open TCP connections that a modern Linux box can have

A single listening port can accept more than one connection simultaneously.

There is a '64K' limit that is often cited, but that is per client per server port, and needs clarifying.

Each TCP/IP packet has basically four fields for addressing. These are:

source_ip source_port destination_ip destination_port
<----- client ------> <--------- server ------------>

Inside the TCP stack, these four fields are used as a compound key to match up packets to connections (e.g. file descriptors).

If a client has many connections to the same port on the same destination, then three of those fields will be the same - only source_port varies to differentiate the different connections. Ports are 16-bit numbers, therefore the maximum number of connections any given client can have to any given host port is 64K.

However, multiple clients can each have up to 64K connections to some server's port, and if the server has multiple ports or either is multi-homed then you can multiply that further.

So the real limit is file descriptors. Each individual socket connection is given a file descriptor, so the limit is really the number of file descriptors that the system has been configured to allow and resources to handle. The maximum limit is typically up over 300K, but is configurable e.g. with sysctl.

The realistic limits being boasted about for normal boxes are around 80K for example single threaded Jabber messaging servers.

Servlet returns "HTTP Status 404 The requested resource (/servlet) is not available"

If you would like to open a servlet with javascript without using 'form' and 'submit' button, here is the following code:

var button = document.getElementById("<<button-id>>");
button.addEventListener("click", function() {
  window.location.href= "<<full-servlet-path>>" (eg. http://localhost:8086/xyz/servlet)
});

Key:

1) button-id : The 'id' tag you give to your button in your html/jsp file.

2) full-servlet-path: The path that shows in the browser when you run the servlet alone

Transparent color of Bootstrap-3 Navbar

you can use this for your css , mainly use css3 rgba as your background in order to control the opacity and use a background fallback for older browser , either using a solid color or a transparent .png image.

.navbar {
   background:rgba(0,0,0,0.5);   /* for latest browsers */
   background: #000;  /* fallback for older browsers */
}

More info: http://css-tricks.com/rgba-browser-support/

psql: could not connect to server: No such file or directory (Mac OS X)

None of the above worked for me. I had to reinstall Postgres the following way :

  • Uninstall postgresql with brew : brew uninstall postgresql
  • brew doctor (fix whatever is here)
  • brew cleanup
  • Remove all Postgres folders :

    • rm -r /usr/local/var/postgres
    • rm -r /Users/<username>/Library/Application\ Support/Postgres
  • Reinstall postgresql with brew : brew install postgresql

  • Start server : brew services start postgresql
  • You should now have to create your databases... (createdb)

How to check if a file contains a specific string using Bash

In addition to other answers, which told you how to do what you wanted, I try to explain what was wrong (which is what you wanted.

In Bash, if is to be followed with a command. If the exit code of this command is equal to 0, then the then part is executed, else the else part if any is executed.

You can do that with any command as explained in other answers: if /bin/true; then ...; fi

[[ is an internal bash command dedicated to some tests, like file existence, variable comparisons. Similarly [ is an external command (it is located typically in /usr/bin/[) that performs roughly the same tests but needs ] as a final argument, which is why ] must be padded with a space on the left, which is not the case with ]].

Here you needn't [[ nor [.

Another thing is the way you quote things. In bash, there is only one case where pairs of quotes do nest, it is "$(command "argument")". But in 'grep 'SomeString' $File' you have only one word, because 'grep ' is a quoted unit, which is concatenated with SomeString and then again concatenated with ' $File'. The variable $File is not even replaced with its value because of the use of single quotes. The proper way to do that is grep 'SomeString' "$File".

Stretch and scale CSS background

Scaling an image with CSS is not quite possible, but a similar effect can be achieved in the following manner, though.

Use this markup:

<div id="background">
    <img src="img.jpg" class="stretch" alt="" />
</div>

with the following CSS:

#background {
    width: 100%; 
    height: 100%; 
    position: absolute; 
    left: 0px; 
    top: 0px; 
    z-index: 0;
}

.stretch {
    width:100%;
    height:100%;
}

and you should be done!

In order to scale the image to be "full bleed" and maintain the aspect ratio, you can do this instead:

.stretch { min-width:100%; min-height:100%; width:auto; height:auto; }

It works out quite nicely! If one dimension is cropped, however, it will be cropped on only one side of the image, rather than being evenly cropped on both sides (and centered). I've tested it in Firefox, Webkit, and Internet Explorer 8.

WARNING: sanitizing unsafe style value url

There is an open issue to only print this warning if there was actually something sanitized: https://github.com/angular/angular/pull/10272

I didn't read in detail when this warning is printed when nothing was sanitized.

How to validate white spaces/empty spaces? [Angular 2]

To automatically remove all spaces from input field you need to create custom validator.

removeSpaces(c: FormControl) {
  if (c && c.value) {
    let removedSpaces = c.value.split(' ').join('');
    c.value !== removedSpaces && c.setValue(removedSpaces);
  }
  return null;
}

It works with entered and pasted text.

How do I position an image at the bottom of div?

< img style="vertical-align: bottom" src="blah.png" >

Works for me. Inside a parallax div as well.

How do I convert csv file to rdd

How about this?

val Delimeter = ","
val textFile = sc.textFile("data.csv").map(line => line.split(Delimeter))

How to kill an Android activity when leaving it so that it cannot be accessed from the back button?

You can also add android:noHistory="true" to your Activity tag in AndroidManifest.xml.

<activity
            ...
            android:noHistory="true">
</activity>

how to get the attribute value of an xml node using java

Since your question is more generic so try to implement it with XML Parsers available in Java .If you need it in specific to parsers, update your code here what you have tried yet

<?xml version="1.0" encoding="UTF-8"?>
<ep>
    <source type="xml">TEST</source>
    <source type="text"></source>
</ep>
DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse("uri to xmlfile");
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile("//ep/source[@type]");
NodeList nl = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);

for (int i = 0; i < nl.getLength(); i++)
{
    Node currentItem = nl.item(i);
    String key = currentItem.getAttributes().getNamedItem("type").getNodeValue();
    System.out.println(key);
}

'Missing contentDescription attribute on image' in XML

Updated:

As pointed out in the comments, setting the description to null indicates that the image is purely decorative and is understood as that by screen readers like TalkBack.

Old answer, I no longer support this answer:

For all the people looking how to avoid the warning:

I don't think android:contentDescription="@null" is the best solution.

I'm using tools:ignore="ContentDescription" that is what is meant to be.

Make sure you include xmlns:tools="http://schemas.android.com/tools" in your root layout.

How to use a variable inside a regular expression?

You can use format keyword as well for this.Format method will replace {} placeholder to the variable which you passed to the format method as an argument.

if re.search(r"\b(?=\w)**{}**\b(?!\w)".**format(TEXTO)**, subject, re.IGNORECASE):
    # Successful match**strong text**
else:
    # Match attempt failed

How do I remove quotes from a string?

str_replace('"', "", $string);
str_replace("'", "", $string);

I assume you mean quotation marks?

Otherwise, go for some regex, this will work for html quotes for example:

preg_replace("/<!--.*?-->/", "", $string);

C-style quotes:

preg_replace("/\/\/.*?\n/", "\n", $string);

CSS-style quotes:

preg_replace("/\/*.*?\*\//", "", $string);

bash-style quotes:

preg-replace("/#.*?\n/", "\n", $string);

Etc etc...

How to force a UIViewController to Portrait orientation in iOS 6

I see the many answer but not get the particular idea and answer about the orientation but see the link good understand the orientation and remove the forcefully rotation for ios6.

http://www.disalvotech.com/blog/app-development/iphone/ios-6-rotation-solution/

I think it is help full.

How to import load a .sql or .csv file into SQLite?

SQLite is extremely flexible as it also allows the SQLite specific dot commands in the SQL syntax, (although they are interpreted by CLI.) This means that you can do things like this.

Create a sms table like this:

# sqlite3 mycool.db '.schema sms'
CREATE TABLE sms (_id integer primary key autoincrement, Address VARCHAR, Display VARCHAR, Class VARCHAR, ServiceCtr VARCHAR, Message VARCHAR, Timestamp TIMESTAMP NOT NULL DEFAULT current_timestamp);

Then two files:

# echo "1,ADREZZ,DizzPlay,CLAZZ,SMSC,DaTestMessage,2015-01-24 21:00:00">test.csv

# cat test.sql
.mode csv
.header on
.import test.csv sms

To test the import of the CSV file using the SQL file, run:

# sqlite3 -csv -header mycool.db '.read test.sql'

In conclusion, this means that you can use the .import statement in SQLite SQL, just as you can do in any other RDB, like MySQL with LOAD DATA INFILE etc. However, this is not recommended.

Check if element is visible in DOM

This is what I did:

HTML & CSS: Made the element hidden by default

<html>
<body>

<button onclick="myFunction()">Click Me</button>

<p id="demo" style ="visibility: hidden;">Hello World</p> 

</body>
</html> 

JavaScript: Added a code to check whether the visibility is hidden or not:

<script>
function myFunction() {
   if ( document.getElementById("demo").style.visibility === "hidden"){
   document.getElementById("demo").style.visibility = "visible";
   }
   else document.getElementById("demo").style.visibility = "hidden";
}
</script>

How can I assign the output of a function to a variable using bash?

You may use bash functions in commands/pipelines as you would otherwise use regular programs. The functions are also available to subshells and transitively, Command Substitution:

VAR=$(scan)

Is the straighforward way to achieve the result you want in most cases. I will outline special cases below.

Preserving trailing Newlines:

One of the (usually helpful) side effects of Command Substitution is that it will strip any number of trailing newlines. If one wishes to preserve trailing newlines, one can append a dummy character to output of the subshell, and subsequently strip it with parameter expansion.

function scan2 () {
    local nl=$'\x0a';  # that's just \n
    echo "output${nl}${nl}" # 2 in the string + 1 by echo
}

# append a character to the total output.
# and strip it with %% parameter expansion.
VAR=$(scan2; echo "x"); VAR="${VAR%%x}"

echo "${VAR}---"

prints (3 newlines kept):

output


---

Use an output parameter: avoiding the subshell (and preserving newlines)

If what the function tries to achieve is to "return" a string into a variable , with bash v4.3 and up, one can use what's called a nameref. Namerefs allows a function to take the name of one or more variables output parameters. You can assign things to a nameref variable, and it is as if you changed the variable it 'points to/references'.

function scan3() {
    local -n outvar=$1    # -n makes it a nameref.
    local nl=$'\x0a'
    outvar="output${nl}${nl}"  # two total. quotes preserve newlines
}

VAR="some prior value which will get overwritten"

# you pass the name of the variable. VAR will be modified.
scan3 VAR

# newlines are also preserved.
echo "${VAR}==="

prints:

output

===

This form has a few advantages. Namely, it allows your function to modify the environment of the caller without using global variables everywhere.

Note: using namerefs can improve the performance of your program greatly if your functions rely heavily on bash builtins, because it avoids the creation of a subshell that is thrown away just after. This generally makes more sense for small functions reused often, e.g. functions ending in echo "$returnstring"

This is relevant. https://stackoverflow.com/a/38997681/5556676

Disable button in jQuery

For Jquery UI buttons this works :

$("#buttonId").button( "option", "disabled", true | false );

How to see PL/SQL Stored Function body in Oracle

If is a package then you can get the source for that with:

    select text from all_source where name = 'PADCAMPAIGN' 
    and type = 'PACKAGE BODY'
    order by line;

Oracle doesn't store the source for a sub-program separately, so you need to look through the package source for it.

Note: I've assumed you didn't use double-quotes when creating that package, but if you did , then use

    select text from all_source where name = 'pAdCampaign' 
    and type = 'PACKAGE BODY'
    order by line;

How to get the system uptime in Windows?

Following are eight ways to find the Uptime in Windows OS.

1: By using the Task Manager

In Windows Vista and Windows Server 2008, the Task Manager has been beefed up to show additional information about the system. One of these pieces of info is the server’s running time.

  1. Right-click on the Taskbar, and click Task Manager. You can also click CTRL+SHIFT+ESC to get to the Task Manager.
  2. In Task Manager, select the Performance tab.
  3. The current system uptime is shown under System or Performance ⇒ CPU for Win 8/10.

    "Up Time" field in Task Manager

2: By using the System Information Utility

The systeminfo command line utility checks and displays various system statistics such as installation date, installed hotfixes and more. Open a Command Prompt and type the following command:

systeminfo

You can also narrow down the results to just the line you need:

systeminfo | find "System Boot Time:"

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3: By using the Uptime Utility

Microsoft have published a tool called Uptime.exe. It is a simple command line tool that analyses the computer's reliability and availability information. It can work locally or remotely. In its simple form, the tool will display the current system uptime. An advanced option allows you to access more detailed information such as shutdown, reboots, operating system crashes, and Service Pack installation.

Read the following KB for more info and for the download links:

To use it, follow these steps:

  1. Download uptime.exe from the above link, and save it to a folder, preferably in one that's in the system's path (such as SYSTEM32).
  2. Open an elevated Command Prompt window. To open an elevated Command Prompt, click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator. You can also type CMD in the search box of the Start menu, and when you see the Command Prompt icon click on it to select it, hold CTRL+SHIFT and press ENTER.
  3. Navigate to where you've placed the uptime.exe utility.
  4. Run the uptime.exe utility. You can add a /? to the command in order to get more options. enter image description here

It does not offer many command line parameters:

C:\uptimefromcodeplex\> uptime /?
usage: Uptime [-V]
    -V   display version

C:\uptimefromcodeplex\> uptime -V
version 1.1.0

3.1: By using the old Uptime Utility

There is an older version of the "uptime.exe" utility. This has the advantage of NOT needing .NET. (It also has a lot more features beyond simple uptime.)

Download link: Windows NT 4.0 Server Uptime Tool (uptime.exe) (final x86)

C:\uptimev100download>uptime.exe /?

UPTIME, Version 1.00
(C) Copyright 1999, Microsoft Corporation

Uptime [server] [/s ] [/a] [/d:mm/dd/yyyy | /p:n] [/heartbeat] [/? | /help]
        server          Name or IP address of remote server to process.
        /s              Display key system events and statistics.
        /a              Display application failure events (assumes /s).
        /d:             Only calculate for events after mm/dd/yyyy.
        /p:             Only calculate for events in the previous n days.
        /heartbeat      Turn on/off the system's heartbeat
        /?              Basic usage.
        /help           Additional usage information.

4: By using the NET STATISTICS Utility

Another easy method, if you can remember it, is to use the approximate information found in the statistics displayed by the NET STATISTICS command. Open a Command Prompt and type the following command:

net statistics workstation

The statistics should tell you how long it’s been running, although in some cases this information is not as accurate as other methods.

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5: By Using the Event Viewer

Probably the most accurate of them all, but it does require some clicking. It does not display an exact day or hour count since the last reboot, but it will display important information regarding why the computer was rebooted and when it did so. We need to look at Event ID 6005, which is an event that tells us that the computer has just finished booting, but you should be aware of the fact that there are virtually hundreds if not thousands of other event types that you could potentially learn from.

Note: BTW, the 6006 Event ID is what tells us when the server has gone down, so if there’s much time difference between the 6006 and 6005 events, the server was down for a long time.

Note: You can also open the Event Viewer by typing eventvwr.msc in the Run command, and you might as well use the shortcut found in the Administrative tools folder.

  1. Click on Event Viewer (Local) in the left navigation pane.
  2. In the middle pane, click on the Information event type, and scroll down till you see Event ID 6005. Double-click the 6005 Event ID, or right-click it and select View All Instances of This Event.
  3. A list of all instances of the 6005 Event ID will be displayed. You can examine this list, look at the dates and times of each reboot event, and so on.
  4. Open Server Manager tool by right-clicking the Computer icon on the start menu (or on the Desktop if you have it enabled) and select Manage. Navigate to the Event Viewer.

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5.1: Eventlog via PowerShell

Get-WinEvent -ProviderName eventlog | Where-Object {$_.Id -eq 6005 -or $_.Id -eq 6006}

6: Programmatically, by using GetTickCount64

GetTickCount64 retrieves the number of milliseconds that have elapsed since the system was started.

7: By using WMI

wmic os get lastbootuptime

8: The new uptime.exe for Windows XP and up

Like the tool from Microsoft, but compatible with all operating systems up to and including Windows 10 and Windows Server 2016, this uptime utility does not require an elevated command prompt and offers an option to show the uptime in both DD:HH:MM:SS and in human-readable formats (when executed with the -h command-line parameter).

Additionally, this version of uptime.exe will run and show the system uptime even when launched normally from within an explorer.exe session (i.e. not via the command line) and pause for the uptime to be read:

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and when executed as uptime -h:

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