Generics/templates in python?

Python uses duck typing, so it doesn't need special syntax to handle multiple types.

If you're from a C++ background, you'll remember that, as long as the operations used in the template function/class are defined on some type T (at the syntax level), you can use that type T in the template.

So, basically, it works the same way:

define a contract for the type of items you want to insert in the binary tree.
document this contract (i.e. in the class documentation)
implement the binary tree using only operations specified in the contract
enjoy

You'll note however, that unless you write explicit type checking (which is usually discouraged), you won't be able to enforce that a binary tree contains only elements of the chosen type.

multiple packages in context:component-scan, spring config

Another general Annotation approach:

@ComponentScan(basePackages = {"x.y.z"})

Git for beginners: The definitive practical guide

Well, despite the fact that you asked that we not "simply" link to other resources, it's pretty foolish when there already exists a community grown (and growing) resource that's really quite good: the Git Community Book. Seriously, this 20+ questions in a question is going to be anything but concise and consistent. The Git Community Book is available as both HTML and PDF and answers many of your questions with clear, well formatted and peer reviewed answers and in a format that allows you to jump straight to your problem at hand.

Alas, if my post really upsets you then I'll delete it. Just say so.

How to set the part of the text view is clickable

For bold,

mySpannable.setSpan(new StyleSpan(Typeface.BOLD),termStart,termStop,Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

display Java.util.Date in a specific format

Use the SimpleDateFormat.format

SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
Date date = new Date();
String sDate= sdf.format(date);

Encode String to UTF-8

You can try this way.

byte ptext[] = myString.getBytes("ISO-8859-1"); 
String value = new String(ptext, "UTF-8");

d3 add text to circle

Here's a way that I consider easier: The general idea is that you want to append a text element to a circle element then play around with its "dx" and "dy" attributes until you position the text at the point in the circle that you like. In my example, I used a negative number for the dx since I wanted to have text start towards the left of the centre.

const nodes = [ {id: ABC, group: 1, level: 1}, {id:XYZ, group: 2, level: 1}, ]

const nodeElems = svg.append('g')
.selectAll('circle')
.data(nodes)
.enter().append('circle')
.attr('r',radius)
.attr('fill', getNodeColor)

const textElems = svg.append('g')
.selectAll('text')
.data(nodes)
.enter().append('text')
.text(node => node.label)
.attr('font-size',8)//font size
.attr('dx', -10)//positions text towards the left of the center of the circle
.attr('dy',4)

syntax error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING

Might be a pasting problem, but as far as I can see from your code, you're missing the single quotes around the HTML part you're echo-ing.

If not, could you post the code correctly and tell us what line is causing the error?

How to set aliases in the Git Bash for Windows?

Go to: C:\Users\ [youruserdirectory] \bash_profile
In your bash_profile file type - alias desk='cd " [DIRECTORY LOCATION] "'
Refresh your User directory where the bash_profile file exists then reopen your CMD or Git Bash window

Type in desk to see if you get to the Desktop location or the location you want in the "DIRECTORY LOCATION" area above

Note: [ desk ] can be what ever name that you choose and should get you to the location you want to get to when typed in the CMD window.

Convert array to string in NodeJS

You're using an Array like an "associative array", which does not exist in JavaScript. Use an Object ({}) instead.

If you are going to continue with an array, realize that toString() will join all the numbered properties together separated by a comma. (the same as .join(",")).

Properties like a and b will not come up using this method because they are not in the numeric indexes. (ie. the "body" of the array)

In JavaScript, Array inherits from Object, so you can add and delete properties on it like any other object. So for an array, the numbered properties (they're technically just strings under the hood) are what counts in methods like .toString(), .join(), etc. Your other properties are still there and very much accessible. :)

Read Mozilla's documentation for more information about Arrays.

var aa = [];

// these are now properties of the object, but not part of the "array body"
aa.a = "A";
aa.b = "B";

// these are part of the array's body/contents
aa[0] = "foo";
aa[1] = "bar";

aa.toString(); // most browsers will say "foo,bar" -- the same as .join(",")

rails 3 validation on uniqueness on multiple attributes

In Rails 2, I would have written:

validates_uniqueness_of :zipcode, :scope => :recorded_at

In Rails 3:

validates :zipcode, :uniqueness => {:scope => :recorded_at}

For multiple attributes:

validates :zipcode, :uniqueness => {:scope => [:recorded_at, :something_else]}

Maven Error: Could not find or load main class

Please follow the below snippet.. it works..

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.xyz</groupId>
    <artifactId>test</artifactId>
    <packaging>jar</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>TestProject</name>
    <description>Sample Project</description>
    <dependencies>
        <!-- mention your dependencies here -->
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.1.1</version>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>com.xyz.ABC.</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

Please note, you have to provide the full classified class name (class name including package name without .java or .class) of main class inside <mainClass></mainClass> tag.

Error:Conflict with dependency 'com.google.code.findbugs:jsr305'

Add this this to dependencies to force using latest version of findbugs library:

compile 'com.google.code.findbugs:jsr305:2.0.1'

How to break out of a loop from inside a switch?

I got same problem and solved using a flag.

bool flag = false;
while(true) {
    switch(msg->state) {
    case MSGTYPE: // ... 
        break;
    // ... more stuff ...
    case DONE:
        flag = true; // **HERE, I want to break out of the loop itself**
    }
    if(flag) break;
}

How to set a:link height/width with css?

Anchors will need to be a different display type than their default to take a height. display:inline-block; or display:block;.

Also check on line-height which might be interesting with this.

Get only specific attributes with from Laravel Collection

this is a follow up on the patricus [answer][1] above but for nested arrays:

$topLevelFields =  ['id','status'];
$userFields = ['first_name','last_name','email','phone_number','op_city_id'];

return $onlineShoppers->map(function ($user) { 
    return collect($user)->only($topLevelFields)
                             ->merge(collect($user['user'])->only($userFields))->all();  
    })->all();

How do I discover memory usage of my application in Android?

This is a work in progress, but this is what I don't understand:

ActivityManager activityManager = (ActivityManager) context.getSystemService(ACTIVITY_SERVICE);
MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();
activityManager.getMemoryInfo(memoryInfo);

Log.i(TAG, " memoryInfo.availMem " + memoryInfo.availMem + "\n" );
Log.i(TAG, " memoryInfo.lowMemory " + memoryInfo.lowMemory + "\n" );
Log.i(TAG, " memoryInfo.threshold " + memoryInfo.threshold + "\n" );

List<RunningAppProcessInfo> runningAppProcesses = activityManager.getRunningAppProcesses();

Map<Integer, String> pidMap = new TreeMap<Integer, String>();
for (RunningAppProcessInfo runningAppProcessInfo : runningAppProcesses)
{
    pidMap.put(runningAppProcessInfo.pid, runningAppProcessInfo.processName);
}

Collection<Integer> keys = pidMap.keySet();

for(int key : keys)
{
    int pids[] = new int[1];
    pids[0] = key;
    android.os.Debug.MemoryInfo[] memoryInfoArray = activityManager.getProcessMemoryInfo(pids);
    for(android.os.Debug.MemoryInfo pidMemoryInfo: memoryInfoArray)
    {
        Log.i(TAG, String.format("** MEMINFO in pid %d [%s] **\n",pids[0],pidMap.get(pids[0])));
        Log.i(TAG, " pidMemoryInfo.getTotalPrivateDirty(): " + pidMemoryInfo.getTotalPrivateDirty() + "\n");
        Log.i(TAG, " pidMemoryInfo.getTotalPss(): " + pidMemoryInfo.getTotalPss() + "\n");
        Log.i(TAG, " pidMemoryInfo.getTotalSharedDirty(): " + pidMemoryInfo.getTotalSharedDirty() + "\n");
    }
}

Why isn't the PID mapped to the result in activityManager.getProcessMemoryInfo()? Clearly you want to make the resulting data meaningful, so why has Google made it so difficult to correlate the results? The current system doesn't even work well if I want to process the entire memory usage since the returned result is an array of android.os.Debug.MemoryInfo objects, but none of those objects actually tell you what pids they are associated with. If you simply pass in an array of all pids, you will have no way to understand the results. As I understand it's use, it makes it meaningless to pass in more than one pid at a time, and then if that's the case, why make it so that activityManager.getProcessMemoryInfo() only takes an int array?

How do I get the dialer to open with phone number displayed?

<TextView
 android:id="@+id/phoneNumber"
 android:autoLink="phone"
 android:linksClickable="true"
 android:text="+91 22 2222 2222"
 />

This is how you can open EditText label assigned number on dialer directly.

Android: How to add R.raw to project?

Create a raw android resource directory.

Once the raw directory is created, Make sure to add a valid media file

Make sure to follow proper naming conventions (lower case letters with underscore '_' as separators)
Media file should have a proper encoding and formatted media file in one of the supported formats.

After following the above procedure, you should be able to access your media files by using R.raw.media_file

How can I sort a std::map first by value, then by key?

EDIT: The other two answers make a good point. I'm assuming that you want to order them into some other structure, or in order to print them out.

"Best" can mean a number of different things. Do you mean "easiest," "fastest," "most efficient," "least code," "most readable?"

The most obvious approach is to loop through twice. On the first pass, order the values:

if(current_value > examined_value)
{
    current_value = examined_value
    (and then swap them, however you like)
}

Then on the second pass, alphabetize the words, but only if their values match.

if(current_value == examined_value)
{
    (alphabetize the two)
}

Strictly speaking, this is a "bubble sort" which is slow because every time you make a swap, you have to start over. One "pass" is finished when you get through the whole list without making any swaps.

There are other sorting algorithms, but the principle would be the same: order by value, then alphabetize.

Print an integer in binary format in Java

check out this logic can convert a number to any base

public static void toBase(int number, int base) {
    String binary = "";
    int temp = number/2+1;
    for (int j = 0; j < temp ; j++) {
        try {
            binary += "" + number % base;

            number /= base;
        } catch (Exception e) {
        }
    }
    for (int j = binary.length() - 1; j >= 0; j--) {
        System.out.print(binary.charAt(j));
    }
}

StringBuilder binary = new StringBuilder();
int n=15;
while (n>0) {
    if((n&1)==1){
        binary.append(1);
    }else
        binary.append(0);
    n>>=1;
}
System.out.println(binary.reverse());

Can Keras with Tensorflow backend be forced to use CPU or GPU at will?

I just spent some time figure it out. Thoma's answer is not complete. Say your program is test.py, you want to use gpu0 to run this program, and keep other gpus free.

You should write CUDA_VISIBLE_DEVICES=0 python test.py

Notice it's DEVICES not DEVICE

MySql: Tinyint (2) vs tinyint(1) - what is the difference?

The (m) indicates the column display width; applications such as the MySQL client make use of this when showing the query results.

For example:

| v   | a   |  b  |   c |
+-----+-----+-----+-----+
| 1   | 1   |  1  |   1 |
| 10  | 10  | 10  |  10 |
| 100 | 100 | 100 | 100 |

Here a, b and c are using TINYINT(1), TINYINT(2) and TINYINT(3) respectively. As you can see, it pads the values on the left side using the display width.

It's important to note that it does not affect the accepted range of values for that particular type, i.e. TINYINT(1) still accepts [-128 .. 127].

Hash Table/Associative Array in VBA

Here we go... just copy the code to a module, it's ready to use

Private Type hashtable
    key As Variant
    value As Variant
End Type

Private GetErrMsg As String

Private Function CreateHashTable(htable() As hashtable) As Boolean
    GetErrMsg = ""
    On Error GoTo CreateErr
        ReDim htable(0)
        CreateHashTable = True
    Exit Function

CreateErr:
    CreateHashTable = False
    GetErrMsg = Err.Description
End Function

Private Function AddValue(htable() As hashtable, key As Variant, value As Variant) As Long
    GetErrMsg = ""
    On Error GoTo AddErr
        Dim idx As Long
        idx = UBound(htable) + 1

        Dim htVal As hashtable
        htVal.key = key
        htVal.value = value

        Dim i As Long
        For i = 1 To UBound(htable)
            If htable(i).key = key Then Err.Raise 9999, , "Key [" & CStr(key) & "] is not unique"
        Next i

        ReDim Preserve htable(idx)

        htable(idx) = htVal
        AddValue = idx
    Exit Function

AddErr:
    AddValue = 0
    GetErrMsg = Err.Description
End Function

Private Function RemoveValue(htable() As hashtable, key As Variant) As Boolean
    GetErrMsg = ""
    On Error GoTo RemoveErr

        Dim i As Long, idx As Long
        Dim htTemp() As hashtable
        idx = 0

        For i = 1 To UBound(htable)
            If htable(i).key <> key And IsEmpty(htable(i).key) = False Then
                ReDim Preserve htTemp(idx)
                AddValue htTemp, htable(i).key, htable(i).value
                idx = idx + 1
            End If
        Next i

        If UBound(htable) = UBound(htTemp) Then Err.Raise 9998, , "Key [" & CStr(key) & "] not found"

        htable = htTemp
        RemoveValue = True
    Exit Function

RemoveErr:
    RemoveValue = False
    GetErrMsg = Err.Description
End Function

Private Function GetValue(htable() As hashtable, key As Variant) As Variant
    GetErrMsg = ""
    On Error GoTo GetValueErr
        Dim found As Boolean
        found = False

        For i = 1 To UBound(htable)
            If htable(i).key = key And IsEmpty(htable(i).key) = False Then
                GetValue = htable(i).value
                Exit Function
            End If
        Next i
        Err.Raise 9997, , "Key [" & CStr(key) & "] not found"

    Exit Function

GetValueErr:
    GetValue = ""
    GetErrMsg = Err.Description
End Function

Private Function GetValueCount(htable() As hashtable) As Long
    GetErrMsg = ""
    On Error GoTo GetValueCountErr
        GetValueCount = UBound(htable)
    Exit Function

GetValueCountErr:
    GetValueCount = 0
    GetErrMsg = Err.Description
End Function

To use in your VB(A) App:

Public Sub Test()
    Dim hashtbl() As hashtable
    Debug.Print "Create Hashtable: " & CreateHashTable(hashtbl)
    Debug.Print ""
    Debug.Print "ID Test   Add V1: " & AddValue(hashtbl, "Hallo_0", "Testwert 0")
    Debug.Print "ID Test   Add V2: " & AddValue(hashtbl, "Hallo_0", "Testwert 0")
    Debug.Print "ID Test 1 Add V1: " & AddValue(hashtbl, "Hallo.1", "Testwert 1")
    Debug.Print "ID Test 2 Add V1: " & AddValue(hashtbl, "Hallo-2", "Testwert 2")
    Debug.Print "ID Test 3 Add V1: " & AddValue(hashtbl, "Hallo 3", "Testwert 3")
    Debug.Print ""
    Debug.Print "Test 1 Removed V1: " & RemoveValue(hashtbl, "Hallo_1")
    Debug.Print "Test 1 Removed V2: " & RemoveValue(hashtbl, "Hallo_1")
    Debug.Print "Test 2 Removed V1: " & RemoveValue(hashtbl, "Hallo-2")
    Debug.Print ""
    Debug.Print "Value Test 3: " & CStr(GetValue(hashtbl, "Hallo 3"))
    Debug.Print "Value Test 1: " & CStr(GetValue(hashtbl, "Hallo_1"))
    Debug.Print ""
    Debug.Print "Hashtable Content:"

    For i = 1 To UBound(hashtbl)
        Debug.Print CStr(i) & ": " & CStr(hashtbl(i).key) & " - " & CStr(hashtbl(i).value)
    Next i

    Debug.Print ""
    Debug.Print "Count: " & CStr(GetValueCount(hashtbl))
End Sub

null terminating a string

From the comp.lang.c FAQ: http://c-faq.com/null/varieties.html

In essence: NULL (the preprocessor macro for the null pointer) is not the same as NUL (the null character).

Get error message if ModelState.IsValid fails?

Ok Check and Add to Watch:

Do a breakpoint at your ModelState line in your Code
Add your model state to your Watch
Expand ModelState "Values"
Expand Values "Results View"

Now you can see a list of all SubKey with its validation state at end of value.

So search for the Invalid value.

How to automatically insert a blank row after a group of data

Insert a column at the left of the table 'Control'
Number the data as 1 to 1000 (assuming there are 1000 rows)
Copy the key field to another sheet and remove duplicates
Copy the unique row items to the main sheet, after 1000th record
In the 'Control' column, add number 1001 to all unique records
Sort the data (including the added records), first on key field and then on 'Control'
A blank line (with data in key field and 'Control') is added

JAX-RS — How to return JSON and HTTP status code together?

The following code worked for me. Injecting the messageContext via annotated setter and setting the status code in my "add" method.

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Response;

import org.apache.cxf.jaxrs.ext.MessageContext;

public class FlightReservationService {

    MessageContext messageContext;

    private final Map<Long, FlightReservation> flightReservations = new HashMap<>();

    @Context
    public void setMessageContext(MessageContext messageContext) {
        this.messageContext = messageContext;
    }

    @Override
    public Collection<FlightReservation> list() {
        return flightReservations.values();
    }

    @Path("/{id}")
    @Produces("application/json")
    @GET
    public FlightReservation get(Long id) {
        return flightReservations.get(id);
    }

    @Path("/")
    @Consumes("application/json")
    @Produces("application/json")
    @POST
    public void add(FlightReservation booking) {
        messageContext.getHttpServletResponse().setStatus(Response.Status.CREATED.getStatusCode());
        flightReservations.put(booking.getId(), booking);
    }

    @Path("/")
    @Consumes("application/json")
    @PUT
    public void update(FlightReservation booking) {
        flightReservations.remove(booking.getId());
        flightReservations.put(booking.getId(), booking);
    }

    @Path("/{id}")
    @DELETE
    public void remove(Long id) {
        flightReservations.remove(id);
    }
}

When to use an interface instead of an abstract class and vice versa?

Purely on the basis of inheritance, you would use an Abstract where you're defining clearly descendant, abstract relationships (i.e. animal->cat) and/or require inheritance of virtual or non-public properties, especially shared state (which Interfaces cannot support).

You should try and favour composition (via dependency injection) over inheritance where you can though, and note that Interfaces being contracts support unit-testing, separation of concerns and (language varying) multiple inheritance in a way Abstracts cannot.

How to do HTTP authentication in android?

This works for me

 URL imageUrl = new URL(url);
                    HttpURLConnection conn = (HttpURLConnection) imageUrl
                            .openConnection();
                    conn.setRequestProperty("Authorization", "basic " +
                            Base64.encode("username:password".getBytes()));
                    conn.setConnectTimeout(30000);
                    conn.setReadTimeout(30000);
                    conn.setInstanceFollowRedirects(true);
                    InputStream is = conn.getInputStream();

Python Pandas: How to read only first n rows of CSV files in?

If you only want to read the first 999,999 (non-header) rows:

read_csv(..., nrows=999999)

If you only want to read rows 1,000,000 ... 1,999,999

read_csv(..., skiprows=1000000, nrows=999999)

nrows : int, default None Number of rows of file to read. Useful for reading pieces of large files*

skiprows : list-like or integer Row numbers to skip (0-indexed) or number of rows to skip (int) at the start of the file

and for large files, you'll probably also want to use chunksize:

chunksize : int, default None Return TextFileReader object for iteration

pandas.io.parsers.read_csv documentation

What is the difference between attribute and property?

Delphi used properties and they have found their way into .NET (because it has the same architect).

In Delphi they are often used in combination with runtime type information such that the integrated property editor can be used to set the property in designtime.

Properties are not always related to fields. They can be functions that possible have side effects (but of course that is very bad design).

Enter key in textarea

You could do something like this:

_x000D_

$("#txtArea").on("keypress",function(e) {_x000D_
    var key = e.keyCode;_x000D_
_x000D_
    // If the user has pressed enter_x000D_
    if (key == 13) {_x000D_
        document.getElementById("txtArea").value =document.getElementById("txtArea").value + "\n";_x000D_
        return false;_x000D_
    }_x000D_
    else {_x000D_
        return true;_x000D_
    }_x000D_
});

_x000D_

<textarea id="txtArea"></textarea>

_x000D_

Difference between RUN and CMD in a Dockerfile

RUN - command triggers while we build the docker image.

CMD - command triggers while we launch the created docker image.

Replacing few values in a pandas dataframe column with another value

Created the Data frame:

import pandas as pd
dk=pd.DataFrame({"BrandName":['A','B','ABC','D','AB'],"Specialty":['H','I','J','K','L']})

Now use DataFrame.replace() function:

dk.BrandName.replace(to_replace=['ABC','AB'],value='A')

How to extract multiple JSON objects from one file?

Update: I wrote a solution that doesn't require reading the entire file in one go. It's too big for a stackoverflow answer, but can be found here jsonstream.

You can use json.JSONDecoder.raw_decode to decode arbitarily big strings of "stacked" JSON (so long as they can fit in memory). raw_decode stops once it has a valid object and returns the last position where wasn't part of the parsed object. It's not documented, but you can pass this position back to raw_decode and it start parsing again from that position. Unfortunately, the Python json module doesn't accept strings that have prefixing whitespace. So we need to search to find the first none-whitespace part of your document.

from json import JSONDecoder, JSONDecodeError
import re

NOT_WHITESPACE = re.compile(r'[^\s]')

def decode_stacked(document, pos=0, decoder=JSONDecoder()):
    while True:
        match = NOT_WHITESPACE.search(document, pos)
        if not match:
            return
        pos = match.start()
        
        try:
            obj, pos = decoder.raw_decode(document, pos)
        except JSONDecodeError:
            # do something sensible if there's some error
            raise
        yield obj

s = """

{"a": 1}  


   [
1
,   
2
]


"""

for obj in decode_stacked(s):
    print(obj)

prints:

{'a': 1}
[1, 2]

How to use ADB in Android Studio to view an SQLite DB

You can use a very nice tool called Stetho by adding this to build.gradle file:

compile 'com.facebook.stetho:stetho:1.4.1'

And initialized it inside your Application or Activity onCreate() method:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Stetho.initializeWithDefaults(this);
    setContentView(R.layout.activity_main);
}

Then you can view the db records in chrome in the address:

chrome://inspect/#devices

For more details you can read my post: How to view easily your db records

How can I tell when HttpClient has timed out?

_httpClient = new HttpClient(handler) {Timeout = TimeSpan.FromSeconds(5)};

is what I usually do, seems to work out pretty good for me, its especially good when using proxies.

Multiple files upload (Array) with CodeIgniter 2.0

I have used below code in my custom library
call that from my controller like below,

function __construct() {<br />
   &nbsp;&nbsp;&nbsp; parent::__construct();<br />
   &nbsp;&nbsp;&nbsp;   $this->load->library('CommonMethods');<br />
}<br />

$config = array();<br />
$config['upload_path'] = 'assets/upload/images/';<br />
$config['allowed_types'] = 'gif|jpg|png|jpeg';<br />
$config['max_width'] = 150;<br />
$config['max_height'] = 150;<br />
$config['encrypt_name'] = TRUE;<br />
$config['overwrite'] = FALSE;<br />

// upload multiplefiles<br />
$fileUploadResponse = $this->commonmethods->do_upload_multiple_files('profile_picture', $config);

/**
 * do_upload_multiple_files - Multiple Methods
 * @param type $fieldName
 * @param type $options
 * @return type
 */
public function do_upload_multiple_files($fieldName, $options) {

    $response = array();
    $files = $_FILES;
    $cpt = count($_FILES[$fieldName]['name']);
    for($i=0; $i<$cpt; $i++)
    {           
        $_FILES[$fieldName]['name']= $files[$fieldName]['name'][$i];
        $_FILES[$fieldName]['type']= $files[$fieldName]['type'][$i];
        $_FILES[$fieldName]['tmp_name']= $files[$fieldName]['tmp_name'][$i];
        $_FILES[$fieldName]['error']= $files[$fieldName]['error'][$i];
        $_FILES[$fieldName]['size']= $files[$fieldName]['size'][$i];    

        $this->CI->load->library('upload');
        $this->CI->upload->initialize($options);

        //upload the image
        if (!$this->CI->upload->do_upload($fieldName)) {
            $response['erros'][] = $this->CI->upload->display_errors();
        } else {
            $response['result'][] = $this->CI->upload->data();
        }
    }

    return $response;
}

How to set focus on input field?

This works well and an angular way to focus input control

angular.element('#elementId').focus()

This is although not a pure angular way of doing the task yet the syntax follows angular style. Jquery plays role indirectly and directly access DOM using Angular (jQLite => JQuery Light).

If required, this code can easily be put inside a simple angular directive where element is directly accessible.

UIView frame, bounds and center

After reading the above answers, here adding my interpretations.

Suppose browsing online, web browser is your frame which decides where and how big to show webpage. Scroller of browser is your bounds.origin that decides which part of webpage will be shown. bounds.origin is hard to understand. The best way to learn is creating Single View Application, trying modify these parameters and see how subviews change.

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(100.0f, 200.0f, 200.0f, 400.0f)];
[view1 setBackgroundColor:[UIColor redColor]];

UIView *view2 = [[UIView alloc] initWithFrame:CGRectInset(view1.bounds, 20.0f, 20.0f)];
[view2 setBackgroundColor:[UIColor yellowColor]];
[view1 addSubview:view2];

[[self view] addSubview:view1];

NSLog(@"Old view1 frame %@, bounds %@, center %@", NSStringFromCGRect(view1.frame), NSStringFromCGRect(view1.bounds), NSStringFromCGPoint(view1.center));
NSLog(@"Old view2 frame %@, bounds %@, center %@", NSStringFromCGRect(view2.frame), NSStringFromCGRect(view2.bounds), NSStringFromCGPoint(view2.center));

// Modify this part.
CGRect bounds = view1.bounds;
bounds.origin.x += 10.0f;
bounds.origin.y += 10.0f;

// incase you need width, height
//bounds.size.height += 20.0f;
//bounds.size.width += 20.0f;

view1.bounds = bounds;

NSLog(@"New view1 frame %@, bounds %@, center %@", NSStringFromCGRect(view1.frame), NSStringFromCGRect(view1.bounds), NSStringFromCGPoint(view1.center));
NSLog(@"New view2 frame %@, bounds %@, center %@", NSStringFromCGRect(view2.frame), NSStringFromCGRect(view2.bounds), NSStringFromCGPoint(view2.center));

How to find the array index with a value?

Here is my take on it, seems like most peoples solutions don't check if the item exists and it removes random values if it does not exist.

First check if the element exists by looking for it's index. If it does exist, remove it by its index using the splice method

elementPosition = array.indexOf(value);

if(elementPosition != -1) {
  array.splice(elementPosition, 1);
}

Saving numpy array to txt file row wise

import numpy as np

a = [1,2,3]    
b = np.array(a).reshape((1,3))    
np.savetxt('a.txt',b,fmt='%d')

How can I change Eclipse theme?

Take a look at rogerdudler/eclipse-ui-themes . In the readme there is a link to a file that you need to extract into your eclipse/dropins folder.

When you have done that go to

Window -> Preferences -> General -> Appearance

And change the theme from GTK (or what ever it is currently) to Dark Juno (or Dark).

That will change the UI to a nice dark theme but to get the complete look and feel you can get the Eclipse Color Theme plugin from eclipsecolorthemes.org. The easiest way is to add this update URI to "Help -> Install New Software" and install it from there.

Eclipse Color Themes

This adds a "Color Theme" menu item under

Window -> Preferences -> Appearance

Where you can select from a large range of editor themes. My preferred one to use with PyDev is Wombat. For Java Solarized Dark

git rebase fatal: Needed a single revision

I ran into this and realized I didn't fetch the upstream before trying to rebase. All I needed was to git fetch upstream

What is the difference between Html.Hidden and Html.HiddenFor

The Html.Hidden creates a hidden input but you have to specify the name and all the attributes you want to give that field and value. The Html.HiddenFor creates a hidden input for the object that you pass to it, they look like this:

Html.Hidden("yourProperty",model.yourProperty);

Html.HiddenFor(m => m.yourProperty)

In this case the output is the same!

What equivalents are there to TortoiseSVN, on Mac OSX?

i use "Versions", quite easy, but not free .

http://versionsapp.com/

how to File.listFiles in alphabetical order?

I think the previous answer is the best way to do it here is another simple way. just to print the sorted results.

 String path="/tmp";
 String[] dirListing = null;
 File dir = new File(path);
 dirListing = dir.list();
 Arrays.sort(dirListing);
 System.out.println(Arrays.deepToString(dirListing));

Forbidden You don't have permission to access / on this server

Found my solution on Apache/2.2.15 (Unix).

And Thanks for answer from @QuantumHive:

First: I finded all

Order allow,deny
Deny from all

instead of

Order allow,deny

Allow from all

and then:

I setted

#
# Control access to UserDir directories.  The following is an example
# for a site where these directories are restricted to read-only.
#
#<Directory /var/www/html>
#    AllowOverride FileInfo AuthConfig Limit
#    Options MultiViews Indexes SymLinksIfOwnerMatch IncludesNoExec
#    <Limit GET POST OPTIONS>
#        Order allow,deny
#        Allow from all
#    </Limit>
#    <LimitExcept GET POST OPTIONS>
#        Order deny,allow
#        Deny from all
#    </LimitExcept>
#</Directory>

Remove the previous "#" annotation to

#
# Control access to UserDir directories.  The following is an example
# for a site where these directories are restricted to read-only.
#
<Directory /var/www/html>
    AllowOverride FileInfo AuthConfig Limit
    Options MultiViews Indexes SymLinksIfOwnerMatch IncludesNoExec
    <Limit GET POST OPTIONS>
        Order allow,deny
        Allow from all
    </Limit>
    <LimitExcept GET POST OPTIONS>
        Order deny,allow
        Deny from all
    </LimitExcept>
</Directory>

ps. my WebDir is: /var/www/html

favicon.png vs favicon.ico - why should I use PNG instead of ICO?

All modern browsers (tested with Chrome 4, Firefox 3.5, IE8, Opera 10 and Safari 4) will always request a favicon.ico unless you've specified a shortcut icon via <link>. So if you don't explicitly specify one, it's best to always have a favicon.ico file, to avoid a 404. Yahoo! suggests you make it small and cacheable.

And you don't have to go for a PNG just for the alpha transparency either. ICO files support alpha transparency just fine (i.e. 32-bit color), though hardly any tools allow you to create them. I regularly use Dynamic Drive's FavIcon Generator to create favicon.ico files with alpha transparency. It's the only online tool I know of that can do it.

There's also a free Photoshop plug-in that can create them.

NoSQL Use Case Scenarios or WHEN to use NoSQL

I think Nosql is "more suitable" in these scenarios at least (more supplementary is welcome)

Easy to scale horizontally by just adding more nodes.
Query on large data set

Imagine tons of tweets posted on twitter every day. In RDMS, there could be tables with millions (or billions?) of rows, and you don't want to do query on those tables directly, not even mentioning, most of time, table joins are also needed for complex queries.
Disk I/O bottleneck

If a website needs to send results to different users based on users' real-time info, we are probably talking about tens or hundreds of thousands of SQL read/write requests per second. Then disk i/o will be a serious bottleneck.

Uri not Absolute exception getting while calling Restful Webservice

Maybe the problem only in your IDE encoding settings. Try to set UTF-8 everywhere:

No Multiline Lambda in Python: Why not?

because a lambda function is supposed to be one-lined, as its the simplest form of a function, an entrance, then return

is inaccessible due to its protection level

Dan, it's just you're accessing the protected field instead of properties.

See for example this line in your Main(...):

myClub.distance = Console.ReadLine();

myClub.distance is the protected field, while you wanted to set the property mydistance.

I'm just giving you some hint, I'm not going to correct your code, since this is homework! ;)

How to add multiple files to Git at the same time

If you want to stage and commit all your files on Github do the following;

git add -A                                                                                
git commit -m "commit message"
git push origin master

fstream won't create a file

You should add fstream::out to open method like this:

file.open("test.txt",fstream::out);

More information about fstream flags, check out this link: http://www.cplusplus.com/reference/fstream/fstream/open/

A better way to check if a path exists or not in PowerShell

This is my powershell newbie way of doing this

if ((Test-Path ".\Desktop\checkfile.txt") -ne "True") {
    Write-Host "Damn it"
} else {
    Write-Host "Yay"
}

Android Shared preferences for creating one time activity (example)

You could also take a look at a past sample project of mine, written for this purpose. I saves locally a name and retrieves it either upon a user's request or when the app starts.

But, at this time, it would be better to use commit (instead of apply) for persisting the data. More info here.

Combining multiple condition in single case statement in Sql Server

select ROUND(CASE 

WHEN  CONVERT( float, REPLACE( isnull( value1,''),',',''))='' AND CONVERT( float, REPLACE( isnull( value2,''),',',''))='' then  CONVERT( float, REPLACE( isnull( value3,''),',',''))

WHEN  CONVERT( float, REPLACE( isnull( value1,''),',',''))='' AND CONVERT( float, REPLACE( isnull( value2,''),',',''))!='' then  CONVERT( float, REPLACE( isnull( value3,''),',',''))

WHEN  CONVERT( float, REPLACE( isnull( value1,''),',',''))!='' AND CONVERT( float, REPLACE( isnull( value2,''),',',''))='' then  CONVERT( float, REPLACE( isnull( value3,''),',',''))

else CONVERT( float, REPLACE(isnull( value1,''),',','')) end,0)  from Tablename where    ID="123"

How to find all occurrences of a substring?

You can use re.finditer() for non-overlapping matches.

>>> import re
>>> aString = 'this is a string where the substring "is" is repeated several times'
>>> print [(a.start(), a.end()) for a in list(re.finditer('is', aString))]
[(2, 4), (5, 7), (38, 40), (42, 44)]

but won't work for:

In [1]: aString="ababa"

In [2]: print [(a.start(), a.end()) for a in list(re.finditer('aba', aString))]
Output: [(0, 3)]

How to parse XML and count instances of a particular node attribute?

A new lib, I fell in love with it after I used it. I recommend it to you.

from simplified_scrapy import SimplifiedDoc
xml = '''
<foo>
   <bar>
      <type foobar="1"/>
      <type foobar="2"/>
   </bar>
</foo>
'''

doc = SimplifiedDoc(xml)
types = doc.selects('bar>type')
print (len(types)) # 2
print (types.foobar) # ['1', '2']
print (doc.selects('bar>type>foobar()')) # ['1', '2']

Here are more examples. This lib is easy to use.

Best way to check if an PowerShell Object exist?

I had the same Problem. This solution works for me.

$Word = $null
$Word = [System.Runtime.InteropServices.Marshal]::GetActiveObject('word.application')
if ($Word -eq $null)
{
    $Word = new-object -ComObject word.application
}

https://msdn.microsoft.com/de-de/library/system.runtime.interopservices.marshal.getactiveobject(v=vs.110).aspx

How to append a newline to StringBuilder

It should be

r.append("\n");

But I recommend you to do as below,

r.append(System.getProperty("line.separator"));

System.getProperty("line.separator") gives you system-dependent newline in java. Also from Java 7 there's a method that returns the value directly: System.lineSeparator()

Is there an XSL "contains" directive?

Sure there is! For instance:

<xsl:if test="not(contains($hhref, '1234'))">
  <li>
    <a href="{$hhref}" title="{$pdate}">
      <xsl:value-of select="title"/>
    </a>
  </li>
</xsl:if>

The syntax is: contains(stringToSearchWithin, stringToSearchFor)

ASP.NET MVC Ajax Error handling

If the server sends some status code different than 200, the error callback is executed:

$.ajax({
    url: '/foo',
    success: function(result) {
        alert('yeap');
    },
    error: function(XMLHttpRequest, textStatus, errorThrown) {
        alert('oops, something bad happened');
    }
});

and to register a global error handler you could use the $.ajaxSetup() method:

$.ajaxSetup({
    error: function(XMLHttpRequest, textStatus, errorThrown) {
        alert('oops, something bad happened');
    }
});

Another way is to use JSON. So you could write a custom action filter on the server which catches exception and transforms them into JSON response:

public class MyErrorHandlerAttribute : FilterAttribute, IExceptionFilter
{
    public void OnException(ExceptionContext filterContext)
    {
        filterContext.ExceptionHandled = true;
        filterContext.Result = new JsonResult
        {
            Data = new { success = false, error = filterContext.Exception.ToString() },
            JsonRequestBehavior = JsonRequestBehavior.AllowGet
        };
    }
}

and then decorate your controller action with this attribute:

[MyErrorHandler]
public ActionResult Foo(string id)
{
    if (string.IsNullOrEmpty(id))
    {
        throw new Exception("oh no");
    }
    return Json(new { success = true });
}

and finally invoke it:

$.getJSON('/home/foo', { id: null }, function (result) {
    if (!result.success) {
        alert(result.error);
    } else {
        // handle the success
    }
});

Resizing image in Java

We're doing this to create thumbnails of images:

  BufferedImage tThumbImage = new BufferedImage( tThumbWidth, tThumbHeight, BufferedImage.TYPE_INT_RGB );
  Graphics2D tGraphics2D = tThumbImage.createGraphics(); //create a graphics object to paint to
  tGraphics2D.setBackground( Color.WHITE );
  tGraphics2D.setPaint( Color.WHITE );
  tGraphics2D.fillRect( 0, 0, tThumbWidth, tThumbHeight );
  tGraphics2D.setRenderingHint( RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR );
  tGraphics2D.drawImage( tOriginalImage, 0, 0, tThumbWidth, tThumbHeight, null ); //draw the image scaled

  ImageIO.write( tThumbImage, "JPG", tThumbnailTarget ); //write the image to a file

sending email via php mail function goes to spam

Try changing your headers to this:

$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type: text/html; charset=iso-8859-1" . "\r\n";
$headers .= "From: [email protected]" . "\r\n" .
"Reply-To: [email protected]" . "\r\n" .
"X-Mailer: PHP/" . phpversion();

For a few reasons.

One of which is the need of a Reply-To and,
The use of apostrophes instead of double-quotes. Those two things in my experience with forms, is usually what triggers a message ending up in the Spam box.

You could also try changing the $from to:

$from = "[email protected]";

EDIT:

See these links I found on the subject https://stackoverflow.com/a/9988544/1415724 and https://stackoverflow.com/a/16717647/1415724 and https://stackoverflow.com/a/9899837/1415724

https://stackoverflow.com/a/5944155/1415724 and https://stackoverflow.com/a/6532320/1415724

Try using the SMTP server of your ISP.

Using this apparently worked for many: X-MSMail-Priority: High

http://www.webhostingtalk.com/showthread.php?t=931932

"My host helped me to enable DomainKeys and SPF Records on my domain and now when I send a test message to my Hotmail address it doesn't end up in Junk. It was actually really easy to enable these settings in cPanel under Email Authentication. I can't believe I never saw that before. It only works with sending through SMTP using phpmailer by the way. Any other way it still is marked as spam."

PHPmailer sending mail to spam in hotmail. how to fix http://pastebin.com/QdQUrfax

PowerShell: Comparing dates

I wanted to show how powerful it can be aside from just checking "-lt".

Example: I used it to calculate time differences take from Windows event view Application log:

Get the difference between the two date times:

PS> $Obj = ((get-date "10/22/2020 12:51:1") - (get-date "10/22/2020 12:20:1 "))

Object created:

PS> $Obj


Days              : 0
Hours             : 0
Minutes           : 31
Seconds           : 0
Milliseconds      : 0
Ticks             : 18600000000
TotalDays         : 0.0215277777777778
TotalHours        : 0.516666666666667
TotalMinutes      : 31
TotalSeconds      : 1860
TotalMilliseconds : 1860000

Access an item directly:

PS> $Obj.Minutes
31

Convert character to ASCII numeric value in java

just a different approach

    String s = "admin";
    byte[] bytes = s.getBytes("US-ASCII");

bytes[0] will represent ascii of a.. and thus the other characters in the whole array.

calling a function from class in python - different way

class MathsOperations:
    def __init__ (self, x, y):
        self.a = x
        self.b = y
    def testAddition (self):
        return (self.a + self.b)

    def testMultiplication (self):
        return (self.a * self.b)

then

temp = MathsOperations()
print(temp.testAddition())

Best way to track onchange as-you-type in input type="text"?

"input" worked for me.

var searchBar  = document.getElementById("searchBar");
searchBar.addEventListener("input", PredictSearch, false);

jQuery counter to count up to a target number

A different approach. Use Tween.js for the counter. It allows the counter to slow down, speed up, bounce, and a slew of other goodies, as the counter gets to where its going.

http://jsbin.com/ekohep/2/edit#javascript,html,live

Enjoy :)

PS, doesn't use jQuery - but obviously could.

Get first day of week in SQL Server

Maybe I'm over simplifying here, and that may be the case, but this seems to work for me. Haven't ran into any problems with it yet...

CAST('1/1/' + CAST(YEAR(GETDATE()) AS VARCHAR(30)) AS DATETIME) + (DATEPART(wk, YOUR_DATE) * 7 - 7) as 'FirstDayOfWeek'
CAST('1/1/' + CAST(YEAR(GETDATE()) AS VARCHAR(30)) AS DATETIME) + (DATEPART(wk, YOUR_DATE) * 7) as 'LastDayOfWeek'

Add single element to array in numpy

t = np.array([2, 3])
t = np.append(t, [4])

How to Detect Browser Window /Tab Close Event?

Yes there is! After a lot of headache i found one solution to this.

Monitor.php

This php file will be monitoring the browser close event. Once the browser is closed the connection_aborted will return 1 hence the loop will break.

<?php
// Ignore user aborts and allow the script
// to run forever
ignore_user_abort(true);
set_time_limit(0);

echo connection_aborted();
while(1)
{
echo "Whatever you echo here wont be printed anywhere but it is required in order to work.";
flush();
if(connection_aborted())
{
break;
// Breaks only when browser is closed
}
}

/*
Action you want to take after browser is closed.
Write your code here
*/
?>

Caller.php

This is the file which will call Monitor.php

<?php
Header('Location: monitor.php');
?>

Parent.html

This will be the file which you will actually interact with. On loading this will directly make an AJAX call to Caller.php which will automatically start Monitor.php in background mode.

<script>

 var xmlhttp = new XMLHttpRequest();
        xmlhttp.onreadystatechange = function() {
            if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {

            }
         }

   xmlhttp.open("GET", "Caller.php", true);
        xmlhttp.send();   

</script>

So the final flow is Parent.html----->Caller.php----->Monitor.php

I don't have "Dynamic Web Project" option in Eclipse new Project wizard

I had a similar problem, you may find that going to the top right corner of your page in Eclipse and click "Java EE" instead of "Java" will solve your problem. I had EE installed correctly like you, and this solved the issue for me. Hope I helped :)

jQuery - Appending a div to body, the body is the object?

    $('body').append($('<div/>', {
        id: 'holdy' 
    }));

Run bash command on jenkins pipeline

I'm sure that the above answers work perfectly. However, I had the difficulty of adding the double quotes as my bash lines where closer to 100. So, the following way helped me. (In a nutshell, no double quotes around each line of the shell)

Also, when I had "bash '''#!/bin/bash" within steps, I got the following error java.lang.NoSuchMethodError: No such DSL method '**bash**' found among steps

pipeline {
    agent none

    stages {

        stage ('Hello') {
            agent any

            steps {
                echo 'Hello, '

                sh '''#!/bin/bash

                    echo "Hello from bash"
                    echo "Who I'm $SHELL"
                '''
            }
        }
    }
}

The result of the above execution is

Read response headers from API response - Angular 5 + TypeScript

Angular 7 Service:

    this.http.post(environment.urlRest + '/my-operation',body, { headers: headers, observe: 'response'});

Component:

    this.myService.myfunction().subscribe(
          (res: HttpResponse) => {
              console.log(res.headers.get('x-token'));
                }  ,
        error =>{
        })

Changing .gitconfig location on Windows

I wanted to do the same thing. The best I could find was @MicTech's solution. However, as pointed out by @MotoWilliams this does not survive any updates made by Git to the .gitconfig file which replaces the link with a new file containing only the new settings.

I solved this by writing the following PowerShell script and running it in my profile startup script. Each time it is run it copies any settings that have been added to the user's .gitconfig to the global one and then replaces all the text in the .gitconfig file with and [include] header that imports the global file.

I keep the global .gitconfig file in a repo along with a lot of other global scripts and tools. All I have to do is remember to check in any changes that the script appends to my global file.

This seems to work pretty transparently for me. Hope it helps!

Sept 9th: Updated to detect when new entries added to the config file are duplicates and ignore them. This is useful for tools like SourceTree which will write new updates if they cannot find existing ones and do not follow includes.

function git-config-update
{
  $localPath = "$env:USERPROFILE\.gitconfig".replace('\', "\\")
  $globalPath = "C:\src\github\Global\Git\gitconfig".replace('\', "\\")

  $redirectAutoText = "# Generated file. Do not edit!`n[include]`n  path = $globalPath`n`n"
  $localText = get-content $localPath

  $diffs = (compare-object -ref $redirectAutoText.split("`n") -diff ($localText) | 
    measure-object).count

  if ($diffs -eq 0)
  {
    write-output ".gitconfig unchanged."
    return
  }

  $skipLines = 0
  $diffs = (compare-object -ref ($redirectAutoText.split("`n") | 
     select -f 3) -diff ($localText | select -f 3) | measure-object).count
  if ($diffs -eq 0)
  {
    $skipLines = 4
    write-warning "New settings appended to $localPath...`n "
  }
  else
  {
    write-warning "New settings found in $localPath...`n "
  }
  $localLines = (get-content $localPath | select -Skip $skipLines) -join "`n"
  $newSettings = $localLines.Split(@("["), [StringSplitOptions]::RemoveEmptyEntries) | 
    where { ![String]::IsNullOrWhiteSpace($_) } | %{ "[$_".TrimEnd() }

  $globalLines = (get-content  $globalPath) -join "`n"
  $globalSettings =  $globalLines.Split(@("["), [StringSplitOptions]::RemoveEmptyEntries)| 
    where { ![String]::IsNullOrWhiteSpace($_) } | %{ "[$_".TrimEnd() }

  $appendSettings = ($newSettings | %{ $_.Trim() } | 
    where { !($globalSettings -contains $_.Trim()) })
  if ([string]::IsNullOrWhitespace($appendSettings))
  {
    write-output "No new settings found."
  }
  else
  {
    echo $appendSettings
    add-content $globalPath ("`n# Additional settings added from $env:COMPUTERNAME on " + (Get-Date -displayhint date) + "`n" + $appendSettings)
  }
  set-content $localPath $redirectAutoText -force
}

How to remove specific element from an array using python

Using filter() and lambda would provide a neat and terse method of removing unwanted values:

newEmails = list(filter(lambda x : x != '[email protected]', emails))

This does not modify emails. It creates the new list newEmails containing only elements for which the anonymous function returned True.

How to save an HTML5 Canvas as an image on a server?

Send canvas image to PHP:

var photo = canvas.toDataURL('image/jpeg');                
$.ajax({
  method: 'POST',
  url: 'photo_upload.php',
  data: {
    photo: photo
  }
});

Here's PHP script:
photo_upload.php

<?php

    $data = $_POST['photo'];
    list($type, $data) = explode(';', $data);
    list(, $data)      = explode(',', $data);
    $data = base64_decode($data);

    mkdir($_SERVER['DOCUMENT_ROOT'] . "/photos");

    file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/photos/".time().'.png', $data);
    die;
?>

How do I encode URI parameter values?

Jersey's UriBuilder encodes URI components using application/x-www-form-urlencoded and RFC 3986 as needed. According to the Javadoc

Builder methods perform contextual encoding of characters not permitted in the corresponding URI component following the rules of the application/x-www-form-urlencoded media type for query parameters and RFC 3986 for all other components. Note that only characters not permitted in a particular component are subject to encoding so, e.g., a path supplied to one of the path methods may contain matrix parameters or multiple path segments since the separators are legal characters and will not be encoded. Percent encoded values are also recognized where allowed and will not be double encoded.

Laravel 5: Retrieve JSON array from $request

Just a mention with jQuery v3.2.1 and Laravel 5.6.

Case 1: The JS object posted directly, like:

$.post("url", {name:'John'}, function( data ) {
});

Corresponding Laravel PHP code should be:

parse_str($request->getContent(),$data); //JSON will be parsed to object $data

Case 2: The JSON string posted, like:

$.post("url", JSON.stringify({name:'John'}), function( data ) {
});

Corresponding Laravel PHP code should be:

$data = json_decode($request->getContent(), true);

Is there an equivalent of 'which' on the Windows command line?

The best version of this I've found on Windows is Joseph Newcomer's "whereis" utility, which is available (with source) from his site.

The article about the development of "whereis" is worth reading.

How do I select the "last child" with a specific class name in CSS?

You can't target the last instance of the class name in your list without JS.

However, you may not be entirely out-of-css-luck, depending on what you are wanting to achieve. For example, by using the next sibling selector, I have added a visual divider after the last of your .list elements here: http://jsbin.com/vejixisudo/edit?html,css,output

Convert from List into IEnumerable format

IEnumerable<Book> _Book_IE;
List<Book> _Book_List;

If it's the generic variant:

_Book_IE = _Book_List;

If you want to convert to the non-generic one:

IEnumerable ie = (IEnumerable)_Book_List;

How to select a single field for all documents in a MongoDB collection?

This works for me,

db.student.find({},{"roll":1})

no condition in where clause i.e., inside first curly braces. inside next curly braces: list of projection field names to be needed in the result and 1 indicates particular field is the part of the query result

Amazon Interview Question: Design an OO parking lot

public class ParkingLot 
{
    Vector<ParkingSpace> vacantParkingSpaces = null;
    Vector<ParkingSpace> fullParkingSpaces = null;

    int parkingSpaceCount = 0;

    boolean isFull;
    boolean isEmpty;

    ParkingSpace findNearestVacant(ParkingType type)
    {
        Iterator<ParkingSpace> itr = vacantParkingSpaces.iterator();

        while(itr.hasNext())
        {
            ParkingSpace parkingSpace = itr.next();

            if(parkingSpace.parkingType == type)
            {
                return parkingSpace;
            }
        }
        return null;
    }

    void parkVehicle(ParkingType type, Vehicle vehicle)
    {
        if(!isFull())
        {
            ParkingSpace parkingSpace = findNearestVacant(type);

            if(parkingSpace != null)
            {
                parkingSpace.vehicle = vehicle;
                parkingSpace.isVacant = false;

                vacantParkingSpaces.remove(parkingSpace);
                fullParkingSpaces.add(parkingSpace);

                if(fullParkingSpaces.size() == parkingSpaceCount)
                    isFull = true;

                isEmpty = false;
            }
        }
    }

    void releaseVehicle(Vehicle vehicle)
    {
        if(!isEmpty())
        {
            Iterator<ParkingSpace> itr = fullParkingSpaces.iterator();

            while(itr.hasNext())
            {
                ParkingSpace parkingSpace = itr.next();

                if(parkingSpace.vehicle.equals(vehicle))
                {
                    fullParkingSpaces.remove(parkingSpace);
                    vacantParkingSpaces.add(parkingSpace);

                    parkingSpace.isVacant = true;
                    parkingSpace.vehicle = null;

                    if(vacantParkingSpaces.size() == parkingSpaceCount)
                        isEmpty = true;

                    isFull = false;
                }
            }
        }
    }

    boolean isFull()
    {
        return isFull;
    }

    boolean isEmpty()
    {
        return isEmpty;
    }
}

public class ParkingSpace 
{
    boolean isVacant;
    Vehicle vehicle;
    ParkingType parkingType;
    int distance;
}

public class Vehicle 
{
    int num;
}

public enum ParkingType
{
    REGULAR,
    HANDICAPPED,
    COMPACT,
    MAX_PARKING_TYPE,
}

How to find if directory exists in Python

So close! os.path.isdir returns True if you pass in the name of a directory that currently exists. If it doesn't exist or it's not a directory, then it returns False.

Add centered text to the middle of a <hr/>-like line

UPDATE: This will not work using HTML5

Instead, check out this question for more techniques: CSS challenge, can I do this without introducing more HTML?

I used line-height:0 to create the effect in the header of my site guerilla-alumnus.com

<div class="description">
   <span>Text</span>
</div>

.description {
   border-top:1px dotted #AAAAAA;
}

.description span {
   background:white none repeat scroll 0 0;
   line-height:0;
   padding:0.1em 1.5em;
   position:relative;
}

Another good method is on http://robots.thoughtbot.com/

He uses a background image and floats to achieve a cool effect

how to Call super constructor in Lombok

This is not possible in Lombok. Although it would be a really nice feature, it requires resolution to find the constructors of the super class. The super class is only known by name the moment Lombok gets invoked. Using the import statements and the classpath to find the actual class is not trivial. And during compilation you cannot just use reflection to get a list of constructors.

It is not entirely impossible but the results using resolution in val and @ExtensionMethod have taught us that is it hard and error-prone.

Disclosure: I am a Lombok developer.

How do I skip an iteration of a `foreach` loop?

The easiest way to do that is like below:

//Skip First Iteration

foreach ( int number in numbers.Skip(1))

//Skip any other like 5th iteration

foreach ( int number in numbers.Skip(5))

Rendering JSON in controller

For the instance of

render :json => @projects, :include => :tasks

You are stating that you want to render @projects as JSON, and include the association tasks on the Project model in the exported data.

For the instance of

render :json => @projects, :callback => 'updateRecordDisplay'

You are stating that you want to render @projects as JSON, and wrap that data in a javascript call that will render somewhat like:

updateRecordDisplay({'projects' => []})

This allows the data to be sent to the parent window and bypass cross-site forgery issues.

scale Image in an UIButton to AspectFit?

If you really want to scale an image, do it, but you should resize it before using it. Resizing it at run time will just lose CPU cycles.

This is the category I'm using to scale an image :

UIImage+Extra.h

@interface UIImage (Extras)
- (UIImage *)imageByScalingProportionallyToSize:(CGSize)targetSize;
@end;

UIImage+Extra.m

@implementation UIImage (Extras)

- (UIImage *)imageByScalingProportionallyToSize:(CGSize)targetSize {

UIImage *sourceImage = self;
UIImage *newImage = nil;

CGSize imageSize = sourceImage.size;
CGFloat width = imageSize.width;
CGFloat height = imageSize.height;

CGFloat targetWidth = targetSize.width;
CGFloat targetHeight = targetSize.height;

CGFloat scaleFactor = 0.0;
CGFloat scaledWidth = targetWidth;
CGFloat scaledHeight = targetHeight;

CGPoint thumbnailPoint = CGPointMake(0.0,0.0);

if (!CGSizeEqualToSize(imageSize, targetSize)) {

        CGFloat widthFactor = targetWidth / width;
        CGFloat heightFactor = targetHeight / height;

        if (widthFactor < heightFactor) 
                scaleFactor = widthFactor;
        else
                scaleFactor = heightFactor;

        scaledWidth  = width * scaleFactor;
        scaledHeight = height * scaleFactor;

        // center the image

        if (widthFactor < heightFactor) {
                thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5; 
        } else if (widthFactor > heightFactor) {
                thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
        }
}


// this is actually the interesting part:

UIGraphicsBeginImageContextWithOptions(targetSize, NO, 0);

CGRect thumbnailRect = CGRectZero;
thumbnailRect.origin = thumbnailPoint;
thumbnailRect.size.width  = scaledWidth;
thumbnailRect.size.height = scaledHeight;

[sourceImage drawInRect:thumbnailRect];

newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

if(newImage == nil) NSLog(@"could not scale image");


return newImage ;
}

@end

You can use it to the size you want. Like :

[self.itemImageButton setImage:[stretchImage imageByScalingProportionallyToSize:CGSizeMake(20,20)]];

Restore LogCat window within Android Studio

In Android Studio 3.4, In the case in which Logcat does not appear in View->ToolWindows->Logcat (in that case Alt+6 or CMD+6 will also not work), the way to get the logact window is:

File->Profile or debug APK (choose an APK)
Select new window or use current window.
Logcat is now available through the menu (View->ToolWindows->Logcat) or through Alt+6 or CMD+6

This issue is an indication that something is not configured correctly with the Android Studio project. The above solution can be useful:

As a temporary solution when there are configuration issues with the Android Studio project, that for some reason are causing Android Studio to hide the logcat window.
When trying to use the Android Studio logcat window for debugging an app without an Android Studio project.

Change Default branch in gitlab

Disable scrolling in an iPhone web application?

document.addEventListener('touchstart', function (e) {
    e.preventDefault();
});

Do not use the ontouchmove property to register the event handler as you are running at risk of overwriting an existing event handler(s). Use addEventListener instead (see the note about IE on the MDN page).

Beware that preventing default for the touchstart event on the window or document will disable scrolling of the descending areas.

To prevent the scrolling of the document but leave all the other events intact prevent default for the first touchmove event following touchstart:

var firstMove;

window.addEventListener('touchstart', function (e) {
    firstMove = true;
});

window.addEventListener('touchmove', function (e) {
    if (firstMove) {
        e.preventDefault();

        firstMove = false;
    }
});

The reason this works is that mobile Safari is using the first move to determine if body of the document is being scrolled. I have realised this while devising a more sophisticated solution.

In case this would ever stop working, the more sophisticated solution is to inspect the touchTarget element and its parents and make a map of directions that can be scrolled to. Then use the first touchmove event to detect the scroll direction and see if it is going to scroll the document or the target element (or either of the target element parents):

var touchTarget,
    touchScreenX,
    touchScreenY,
    conditionParentUntilTrue,
    disableScroll,
    scrollMap;

conditionParentUntilTrue = function (element, condition) {
    var outcome;

    if (element === document.body) {
        return false;
    }

    outcome = condition(element);

    if (outcome) {
        return true;
    } else {
        return conditionParentUntilTrue(element.parentNode, condition);
    }
};

window.addEventListener('touchstart', function (e) {
    touchTarget = e.targetTouches[0].target;
    // a boolean map indicating if the element (or either of element parents, excluding the document.body) can be scrolled to the X direction.
    scrollMap = {}

    scrollMap.left = conditionParentUntilTrue(touchTarget, function (element) {
        return element.scrollLeft > 0;
    });

    scrollMap.top = conditionParentUntilTrue(touchTarget, function (element) {
        return element.scrollTop > 0;
    });

    scrollMap.right = conditionParentUntilTrue(touchTarget, function (element) {
        return element.scrollWidth > element.clientWidth &&
               element.scrollWidth - element.clientWidth > element.scrollLeft;
    });

    scrollMap.bottom =conditionParentUntilTrue(touchTarget, function (element) {
        return element.scrollHeight > element.clientHeight &&
               element.scrollHeight - element.clientHeight > element.scrollTop;
    });

    touchScreenX = e.targetTouches[0].screenX;
    touchScreenY = e.targetTouches[0].screenY;
    disableScroll = false;
});

window.addEventListener('touchmove', function (e) {
    var moveScreenX,
        moveScreenY;

    if (disableScroll) {
        e.preventDefault();

        return;
    }

    moveScreenX = e.targetTouches[0].screenX;
    moveScreenY = e.targetTouches[0].screenY;

    if (
        moveScreenX > touchScreenX && scrollMap.left ||
        moveScreenY < touchScreenY && scrollMap.bottom ||
        moveScreenX < touchScreenX && scrollMap.right ||
        moveScreenY > touchScreenY && scrollMap.top
    ) {
        // You are scrolling either the element or its parent.
        // This will not affect document.body scroll.
    } else {
        // This will affect document.body scroll.

        e.preventDefault();

        disableScroll = true;
    }
});

The reason this works is that mobile Safari is using the first touch move to determine if the document body is being scrolled or the element (or either of the target element parents) and sticks to this decision.

What is size_t in C?

In general, if you are starting at 0 and going upward, always use an unsigned type to avoid an overflow taking you into a negative value situation. This is critically important, because if your array bounds happens to be less than the max of your loop, but your loop max happens to be greater than the max of your type, you will wrap around negative and you may experience a segmentation fault (SIGSEGV). So, in general, never use int for a loop starting at 0 and going upwards. Use an unsigned.

Is it possible to run .php files on my local computer?

Sure you just need to setup a local web server. Check out XAMPP: http://www.apachefriends.org/en/xampp.html

That will get you up and running in about 10 minutes.

There is now a way to run php locally without installing a server: https://stackoverflow.com/a/21872484/672229

Yes but the files need to be processed. For example you can install test servers like mamp / lamp / wamp depending on your plateform.

Basically you need apache / php running.

Run jQuery function onclick

You can bind the mouseenter and mouseleave events and jQuery will emulate those where they are not native.

$("div.system_box").on('mouseenter', function(){
    //enter
})
.on('mouseleave', function(){
    //leave
});

fiddle

note: do not use hover as that is deprecated

Android: How to create a Dialog without a title?

set the "gravity" attribute on the entire dialog to "center". Then you will need to override that setting to all of the child components in the dialog that you do not want centered.

How to get values from IGrouping

From definition of IGrouping :

IGrouping<out TKey, out TElement> : IEnumerable<TElement>, IEnumerable

you can just iterate through elements like this:

IEnumerable<IGrouping<int, smth>> groups = list.GroupBy(x => x.ID)
foreach(IEnumerable<smth> element in groups)
{
//do something
}

How to refactor Node.js code that uses fs.readFileSync() into using fs.readFile()?

var fs = require("fs");
var filename = "./index.html";

function start(resp) {
    resp.writeHead(200, {
        "Content-Type": "text/html"
    });
    fs.readFile(filename, "utf8", function(err, data) {
        if (err) throw err;
        resp.write(data);
        resp.end();
    });
}

Index was out of range. Must be non-negative and less than the size of the collection parameter name:index

This error is caused when you have enabled paging in Grid view. If you want to delete a record from grid then you have to do something like this.

int index = Convert.ToInt32(e.CommandArgument);
int i = index % 20;
// Here 20 is my GridView's Page Size.
GridViewRow row = gvMainGrid.Rows[i];
int id = Convert.ToInt32(gvMainGrid.DataKeys[i].Value);
new GetData().DeleteRecord(id);
GridView1.DataSource = RefreshGrid();
GridView1.DataBind();

Hope this answers the question.

Split (explode) pandas dataframe string entry to separate rows

I have come up with the following solution to this problem:

def iter_var1(d):
    for _, row in d.iterrows():
        for v in row["var1"].split(","):
            yield (v, row["var2"])

new_a = DataFrame.from_records([i for i in iter_var1(a)],
        columns=["var1", "var2"])

Missing XML comment for publicly visible type or member

I got that message after attached an attribute to a method

[webMethod]
public void DoSomething()
{
}

But the correct way was this:

[webMethod()] // Note the Parentheses 
public void DoSomething()
{
}

How to fix org.hibernate.LazyInitializationException - could not initialize proxy - no Session

What is wrong here is that your session management configuration is set to close session when you commit transaction. Check if you have something like:

<property name="current_session_context_class">thread</property>

in your configuration.

In order to overcome this problem you could change the configuration of session factory or open another session and only than ask for those lazy loaded objects. But what I would suggest here is to initialize this lazy collection in getModelByModelGroup itself and call:

Hibernate.initialize(subProcessModel.getElement());

when you are still in active session.

And one last thing. A friendly advice. You have something like this in your method:

for (Model m : modelList) {
    if (m.getModelType().getId() == 3) {
        model = m;
        break;
    }
}

Please insted of this code just filter those models with type id equal to 3 in the query statement just couple of lines above.

Some more reading:

session factory configuration

problem with closed session

What is the SSIS package and what does it do?

Microsoft SQL Server Integration Services (SSIS) is a platform for building high-performance data integration solutions, including extraction, transformation, and load (ETL) packages for data warehousing. SSIS includes graphical tools and wizards for building and debugging packages; tasks for performing workflow functions such as FTP operations, executing SQL statements, and sending e-mail messages; data sources and destinations for extracting and loading data; transformations for cleaning, aggregating, merging, and copying data; a management database, SSISDB, for administering package execution and storage; and application programming interfaces (APIs) for programming the Integration Services object model.

As per Microsoft, the main uses of SSIS Package are:

• Merging Data from Heterogeneous Data Stores Populating Data

• Warehouses and Data Marts Cleaning and Standardizing Data Building

• Business Intelligence into a Data Transformation Process Automating

• Administrative Functions and Data Loading

For developers:

SSIS Package can be integrated with VS development environment for building Business Intelligence solutions. Business Intelligence Development Studio is the Visual Studio environment with enhancements that are specific to business intelligence solutions. It work with 32-bit development environment only.

Download SSDT tools for Visual Studio:

http://www.microsoft.com/en-us/download/details.aspx?id=36843

Creating SSIS ETL Package - Basics :

https://docs.microsoft.com/en-us/sql/integration-services/ssis-how-to-create-an-etl-package?view=sql-server-2017

Sample project of SSIS features in 6 lessons:

https://docs.microsoft.com/en-us/sql/integration-services/ssis-how-to-create-an-etl-package?view=sql-server-2017

how to upload a file to my server using html

On top of what the others have already stated, some sort of server-side scripting is necessary in order for the server to read and save the file.

Using PHP might be a good choice, but you're free to use any server-side scripting language. http://www.w3schools.com/php/php_file_upload.asp may be of use on that end.

PHP function use variable from outside

Alternatively, you can bring variables in from the outside scope by using closures with the use keyword.

$myVar = "foo";
$myFunction = function($arg1, $arg2) use ($myVar)
{
 return $arg1 . $myVar . $arg2;
};

Global variables in Java

You don't. That's by design. You shouldn't do it even if you could.

That being said you could create a set of public static members in a class named Globals.

public class Globals {
   public static int globalInt = 0;
   ///
}

but you really shouldn't :). Seriously .. don't do it.

Restore a deleted file in the Visual Studio Code Recycle Bin

Just look up the files you deleted, inside Recycle Bin. Right click on it and do restore as you do normally with other deleted files. It is similar as you do normally because VS code also uses normal trash of your system.

Difference between Activity Context and Application Context

This obviously is deficiency of the API design. In the first place, Activity Context and Application context are totally different objects, so the method parameters where context is used should use ApplicationContext or Activity directly, instead of using parent class Context. In the second place, the doc should specify which context to use or not explicitly.

YouTube iframe API: how do I control an iframe player that's already in the HTML?

You can do this with far less code:

function callPlayer(func, args) {
    var i = 0,
        iframes = document.getElementsByTagName('iframe'),
        src = '';
    for (i = 0; i < iframes.length; i += 1) {
        src = iframes[i].getAttribute('src');
        if (src && src.indexOf('youtube.com/embed') !== -1) {
            iframes[i].contentWindow.postMessage(JSON.stringify({
                'event': 'command',
                'func': func,
                'args': args || []
            }), '*');
        }
    }
}

Working example: http://jsfiddle.net/kmturley/g6P5H/296/

Error: JAVA_HOME is not defined correctly executing maven

JAVA_HOME should be /usr/lib/jvm/java-7-oracle/jre/.

How do I change the font-size of an <option> element within <select>?

Like most form controls in HTML, the results of applying CSS to <select> and <option> elements vary a lot between browsers. Chrome, as you've found, won't let you apply and font styles to an <option> element directly --- if you do Inspect Element on it, you'll see the font-size: 14px declaration is crossed through as if it's been overridden by the cascade, but it's actually because Chrome is ignoring it.

However, Chrome will let you apply font styles to the <optgroup> element, so to achieve the result you want you can wrap all the <option>s in an <optgroup> and then apply your font styles to a .styled-select optgroup selector. If you want the optgroup sans-label, you may have to do some clever CSS with positioning or something to hide the white area at the top where the label would be shown, but that should be possible.

Forked to a new JSFiddle to show you what I mean:

http://jsfiddle.net/zRtbZ/

Is it possible to style a select box?

You can style to some degree with CSS by itself

select {
    background: red;
    border: 2px solid pink;
}

But this is entirely up to the browser. Some browsers are stubborn.

However, this will only get you so far, and it doesn't always look very good. For complete control, you'll need to replace a select via jQuery with a widget of your own that emulates the functionality of a select box. Ensure that when JS is disabled, a normal select box is in its place. This allows more users to use your form, and it helps with accessibility.

Uninstall all installed gems, in OSX?

gem list --no-version | grep -v -e 'psych' -e 'rdoc' -e 'openssl' -e 'json' -e 'io-console' -e 'bigdecimal' | xargs sudo gem uninstall -ax

grep here is excluding default gems. All other gems will be uninstalled. You can also precede it with sudo in case you get permission issues.

Android studio logcat nothing to show

I had a custom ROM on my phone which for some reason did not output logcat, but the emulator and another device did. Wiping and installing the ROM got the logcat working again.

How do you represent a JSON array of strings?

I'll elaborate a bit more on ChrisR awesome answer and bring images from his awesome reference.

A valid JSON always starts with either curly braces { or square brackets [, nothing else.

`{` will start an `object`:

left brace followed by a key string (a name that can't be repeated, in quotes), colon and a value (valid types shown below), followed by an optional comma to add more pairs of string and value at will and finished with a right brace

{ "key": value, "another key": value }

Hint: although javascript accepts single quotes ', JSON only takes double ones ".

`[` will start an `array`:

left bracket followed by value, optional comma to add more value at will and finished with a right bracket

[value, value]

Hint: spaces among elements are always ignored by any JSON parser.

And `value` is an `object`, `array`, `string`, `number`, `bool` or `null`:

Image showing the 6 types a JSON value can be: string, number, JSON object, Array/list, boolean, and null

So yeah, ["a", "b"] is a perfectly valid JSON, like you could try on the link Manish pointed.

Here are a few extra valid JSON examples, one per block:

{}

[0]

{"__comment": "json doesn't accept comments and you should not be commenting even in this way", "avoid!": "also, never add more than one key per line, like this"}

[{   "why":null} ]

{
  "not true": [0, false],
  "true": true,
  "not null": [0, 1, false, true, {
    "obj": null
  }, "a string"]
}

javascript: get a function's variable's value within another function

Your nameContent variable is inside the function scope and not visible outside that function so if you want to use the nameContent outside of the function then declare it global inside the <script> tag and use inside functions without the var keyword as follows

<script language="javascript" type="text/javascript">
    var nameContent; // In the global scope
    function first(){
        nameContent=document.getElementById('full_name').value;
    }

    function second() {
        first();
        y=nameContent; 
        alert(y);
    }
    second();
</script>

Compare data of two Excel Columns A & B, and show data of Column A that do not exist in B

Suppose you have data in A1:A10 and B1:B10 and you want to highlight which values in A1:A10 do not appear in B1:B10.

Try as follows:

Format > Conditional Formating...
Select 'Formula Is' from drop down menu
Enter the following formula:

=ISERROR(MATCH(A1,$B$1:$B$10,0))
Now select the format you want to highlight the values in col A that do not appear in col B

This will highlight any value in Col A that does not appear in Col B.

ASP.NET MVC Html.ValidationSummary(true) does not display model errors

In my case it was not working because of the return.

Instead of using:

return RedirectToAction("Rescue", "CarteiraEtapaInvestimento", new { id = investimento.Id, idCarteiraEtapaResgate = etapaDoResgate.Id });

I used:

return View("ViewRescueCarteiraEtapaInvestimento", new CarteiraEtapaInvestimentoRescueViewModel { Investimento = investimento, ValorResgate = investimentoViewModel.ValorResgate });

It´s a Model, so it is obvius that ModelState.AddModelError("keyName","Message"); must work with a model.

This answer show why. Adding validation with DataAnnotations

Undo a merge by pull request?

Starting June 24th, 2014, you can try cancel a PR easily (See "Reverting a pull request") with:

Introducing the Revert Button

you can easily revert a pull request on GitHub by clicking Revert:

You'll be prompted to create a new pull request with the reverted changes:

It remains to be tested though if that revert uses -m or not (for reverting merges as well)

But Adil H Raza adds in the comments (Dec. 2019):

That is the expected behavior, it created a new branch and you can create a PR from this new branch to your master.
This way in the future you can un-revert the revert if need be, it is safest option and not directly changing your master.

Warning: Korayem points out in the comments that:

After a revert, let's say you did some further changes on Git branch and created a new PR from same source/destination branch.
You will find the PR showing only new changes, but nothing of what was there before reverting.

Korayem refers us to "Github: Changes ignored after revert (git cherry-pick, git rebase)" for more.

setting multiple column using one update

Just add parameters, split by comma:

UPDATE tablename SET column1 = "value1", column2 = "value2" ....

AddRange to a Collection

Since .NET4.5 if you want one-liner you can use System.Collections.Generic ForEach.

source.ForEach(o => destination.Add(o));

or even shorter as

source.ForEach(destination.Add);

Performance-wise it's the same as for each loop (syntactic sugar).

Also don't try assigning it like

var x = source.ForEach(destination.Add)

cause ForEach is void.

Edit: Copied from comments, Lipert's opinion on ForEach

mysql query result in php variable

Of course there is. Check out mysql_query, and mysql_fetch_row if you use MySQL.
Example from PHP manual:

<?php
$result = mysql_query("SELECT id,email FROM people WHERE id = '42'");
if (!$result) {
    echo 'Could not run query: ' . mysql_error();
    exit;
}
$row = mysql_fetch_row($result);

echo $row[0]; // 42
echo $row[1]; // the email value
?>

Very Long If Statement in Python

According to PEP8, long lines should be placed in parentheses. When using parentheses, the lines can be broken up without using backslashes. You should also try to put the line break after boolean operators.

Further to this, if you're using a code style check such as pycodestyle, the next logical line needs to have different indentation to your code block.

For example:

if (abcdefghijklmnopqrstuvwxyz > some_other_long_identifier and
        here_is_another_long_identifier != and_finally_another_long_name):
    # ... your code here ...
    pass

raw_input function in Python

Another example method, to mix the prompt using print, if you need to make your code simpler.

Format:-

x = raw_input () -- This will return the user input as a string

x= int(raw_input()) -- Gets the input number as a string from raw_input() and then converts it to an integer using int().

print '\nWhat\'s your name ?', 
name = raw_input('--> ')
print '\nHow old are you, %s?' % name,
age = int(raw_input())
print '\nHow tall are you (in cms), %s?' % name,
height = int(raw_input())
print '\nHow much do you weigh (in kgs), %s?' % name,
weight = int(raw_input())

print '\nSo, %s is %d years old, %d cms tall and weighs %d kgs.\n' %(
name, age, height, weight)

Windows 7 - Add Path

Try this in cmd:

cd address_of_sumatrapdf.exe_file && sumatrapdf.exe

Where you should put the address of your .exe file instead of adress_of_sumatrapdf.exe_file.

What's the difference between compiled and interpreted language?

A compiler, in general, reads higher level language computer code and converts it to either p-code or native machine code. An interpreter runs directly from p-code or an interpreted code such as Basic or Lisp. Typically, compiled code runs much faster, is more compact, and has already found all of the syntax errors and many of the illegal reference errors. Interpreted code only finds such errors after the application attempts to interpret the affected code. Interpreted code is often good for simple applications that will only be used once or at most a couple times, or maybe even for prototyping. Compiled code is better for serious applications. A compiler first takes in the entire program, checks for errors, compiles it and then executes it. Whereas, an interpreter does this line by line, so it takes one line, checks it for errors, and then executes it.

If you need more information, just Google for "difference between compiler and interpreter".

How to set a header for a HTTP GET request, and trigger file download?

There are two ways to download a file where the HTTP request requires that a header be set.

The credit for the first goes to @guest271314, and credit for the second goes to @dandavis.

The first method is to use the HTML5 File API to create a temporary local file, and the second is to use base64 encoding in conjunction with a data URI.

The solution I used in my project uses the base64 encoding approach for small files, or when the File API is not available, otherwise using the the File API approach.

Solution:

        var id = 123;

        var req = ic.ajax.raw({
            type: 'GET',
            url: '/api/dowloads/'+id,
            beforeSend: function (request) {
                request.setRequestHeader('token', 'token for '+id);
            },
            processData: false
        });

        var maxSizeForBase64 = 1048576; //1024 * 1024

        req.then(
            function resolve(result) {
                var str = result.response;

                var anchor = $('.vcard-hyperlink');
                var windowUrl = window.URL || window.webkitURL;
                if (str.length > maxSizeForBase64 && typeof windowUrl.createObjectURL === 'function') {
                    var blob = new Blob([result.response], { type: 'text/bin' });
                    var url = windowUrl.createObjectURL(blob);
                    anchor.prop('href', url);
                    anchor.prop('download', id+'.bin');
                    anchor.get(0).click();
                    windowUrl.revokeObjectURL(url);
                }
                else {
                    //use base64 encoding when less than set limit or file API is not available
                    anchor.attr({
                        href: 'data:text/plain;base64,'+FormatUtils.utf8toBase64(result.response),
                        download: id+'.bin',
                    });
                    anchor.get(0).click();
                }

            }.bind(this),
            function reject(err) {
                console.log(err);
            }
        );

Note that I'm not using a raw XMLHttpRequest, and instead using ic-ajax, and should be quite similar to a jQuery.ajax solution.

Note also that you should substitute text/bin and .bin with whatever corresponds to the file type being downloaded.

The implementation of FormatUtils.utf8toBase64 can be found here

Partly JSON unmarshal into a map in Go

This can be accomplished by Unmarshaling into a map[string]json.RawMessage.

var objmap map[string]json.RawMessage
err := json.Unmarshal(data, &objmap)

To further parse sendMsg, you could then do something like:

var s sendMsg
err = json.Unmarshal(objmap["sendMsg"], &s)

For say, you can do the same thing and unmarshal into a string:

var str string
err = json.Unmarshal(objmap["say"], &str)

EDIT: Keep in mind you will also need to export the variables in your sendMsg struct to unmarshal correctly. So your struct definition would be:

type sendMsg struct {
    User string
    Msg  string
}

Example: https://play.golang.org/p/OrIjvqIsi4-

Accessing last x characters of a string in Bash

Last three characters of string:

${string: -3}

${string:(-3)}

(mind the space between : and -3 in the first form).

Please refer to the Shell Parameter Expansion in the reference manual:

${parameter:offset}
${parameter:offset:length}

Expands to up to length characters of parameter starting at the character
specified by offset. If length is omitted, expands to the substring of parameter
starting at the character specified by offset. length and offset are arithmetic
expressions (see Shell Arithmetic). This is referred to as Substring Expansion.

If offset evaluates to a number less than zero, the value is used as an offset
from the end of the value of parameter. If length evaluates to a number less than
zero, and parameter is not ‘@’ and not an indexed or associative array, it is
interpreted as an offset from the end of the value of parameter rather than a
number of characters, and the expansion is the characters between the two
offsets. If parameter is ‘@’, the result is length positional parameters
beginning at offset. If parameter is an indexed array name subscripted by ‘@’ or
‘*’, the result is the length members of the array beginning with
${parameter[offset]}. A negative offset is taken relative to one greater than the
maximum index of the specified array. Substring expansion applied to an
associative array produces undefined results.

Note that a negative offset must be separated from the colon by at least one
space to avoid being confused with the ‘:-’ expansion. Substring indexing is
zero-based unless the positional parameters are used, in which case the indexing
starts at 1 by default. If offset is 0, and the positional parameters are used,
$@ is prefixed to the list.

Since this answer gets a few regular views, let me add a possibility to address John Rix's comment; as he mentions, if your string has length less than 3, ${string: -3} expands to the empty string. If, in this case, you want the expansion of string, you may use:

${string:${#string}<3?0:-3}

This uses the ?: ternary if operator, that may be used in Shell Arithmetic; since as documented, the offset is an arithmetic expression, this is valid.

Update for a POSIX-compliant solution

The previous part gives the best option when using Bash. If you want to target POSIX shells, here's an option (that doesn't use pipes or external tools like cut):

# New variable with 3 last characters removed
prefix=${string%???}
# The new string is obtained by removing the prefix a from string
newstring=${string#"$prefix"}

One of the main things to observe here is the use of quoting for prefix inside the parameter expansion. This is mentioned in the POSIX ref (at the end of the section):

The following four varieties of parameter expansion provide for substring processing. In each case, pattern matching notation (see Pattern Matching Notation), rather than regular expression notation, shall be used to evaluate the patterns. If parameter is '#', '*', or '@', the result of the expansion is unspecified. If parameter is unset and set -u is in effect, the expansion shall fail. Enclosing the full parameter expansion string in double-quotes shall not cause the following four varieties of pattern characters to be quoted, whereas quoting characters within the braces shall have this effect. In each variety, if word is omitted, the empty pattern shall be used.

This is important if your string contains special characters. E.g. (in dash),

$ string="hello*ext"
$ prefix=${string%???}
$ # Without quotes (WRONG)
$ echo "${string#$prefix}"
*ext
$ # With quotes (CORRECT)
$ echo "${string#"$prefix"}"
ext

Of course, this is usable only when then number of characters is known in advance, as you have to hardcode the number of ? in the parameter expansion; but when it's the case, it's a good portable solution.

JQuery: 'Uncaught TypeError: Illegal invocation' at ajax request - several elements

From the jQuery docs for processData:

processData Boolean
^{Default: true}
By default, data passed in to the data option as an object (technically, anything other than a string) will be processed and transformed into a query string, fitting to the default content-type "application/x-www-form-urlencoded". If you want to send a DOMDocument, or other non-processed data, set this option to false.

Source: http://api.jquery.com/jquery.ajax

Looks like you are going to have to use processData to send your data to the server, or modify your php script to support querystring encoded parameters.

Bootstrap 3 Horizontal Divider (not in a dropdown)

As I found the default Bootstrap <hr/> size unsightly, here's some simple HTML and CSS to balance out the element visually:

HTML:

<hr class="half-rule"/>

CSS:

.half-rule { 
    margin-left: 0;
    text-align: left;
    width: 50%;
 }

There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key country

you can use this:

 var list = new SelectList(countryList, "Id", "Name");
 ViewBag.countries=list;
 @Html.DropDownList("countries",ViewBag.countries as SelectList)

Best way to make WPF ListView/GridView sort on column-header clicking?

It all depends really, if you're using the DataGrid from the WPF Toolkit then there is a built in sort, even a multi-column sort which is very useful. Check more out here:

Vincent Sibals Blog

Alternatively, if you're using a different control that doesn't support sorting, i'd recommend the following methods:

Li Gao's Custom Sorting

Followed by:

Li Gao's Faster Sorting

Making a UITableView scroll when text field is selected

Swift 4.2 complete solution

I've created GIST with set of protocols that simplifies work with adding extra space when keyboard is shown, hidden or changed.

Features:

Correctly works with keyboard frame changes (e.g. keyboard height changes like emojii ? normal keyboard).
TabBar & ToolBar support for UITableView example (at other examples you receive incorrect insets).
Dynamic animation duration (not hard-coded).
Protocol-oriented approach that could be easily modified for you purposes.

Usage

Basic usage example in view controller that contains some scroll view (table view is supported also of course).

class SomeViewController: UIViewController {
  @IBOutlet weak var scrollView: UIScrollView!

  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    addKeyboardFrameChangesObserver()
  }

  override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    removeKeyboardFrameChangesObserver()
  }
}

extension SomeViewController: ModifableInsetsOnKeyboardFrameChanges {
  var scrollViewToModify: UIScrollView { return scrollView }
}

Core: frame changes observer

Protocol KeyboardChangeFrameObserver will fire event each time keyboard frame was changed (including showing, hiding, frame changing).

Call addKeyboardFrameChangesObserver() at viewWillAppear() or similar method.
Call removeKeyboardFrameChangesObserver() at viewWillDisappear() or similar method.

Implementation: scrolling view

ModifableInsetsOnKeyboardFrameChanges protocol adds UIScrollView support to core protocol. It changes scroll view's insets when keyboard frame is changed.

Your class needs to set scroll view, one's insets will be increased / decreased on keyboard frame changes.

var scrollViewToModify: UIScrollView { get }

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at

The server at x3.chatforyoursite.com needs to output the following header:

Access-Control-Allow-Origin: http://www.example.com

Where http://www.example.com is your website address. You should check your settings on chatforyoursite.com to see if you can enable this - if not their technical support would probably be the best way to resolve this. However to answer your question, you need the remote site to allow your site to access AJAX responses client side.

ERROR 1044 (42000): Access denied for 'root' With All Privileges

The reason i could not delete some of the users via 'drop' statement was that there is a bug in Mysql http://bugs.mysql.com/bug.php?id=62255 with hostname containing upper case letters. The solution was running following query:

DELETE FROM mysql.user where host='Some_Host_With_UpperCase_Letters';

I am still trying to figure the other issue where the root user with all permissions are unable to grant privileges to new user for particular database

How do I get the height and width of the Android Navigation Bar programmatically?

In case of Samsung S8 none of the above provided methods were giving proper height of navigation bar so I used the KeyboardHeightProvider keyboard height provider android. And it gave me height in negative values and for my layout positioning I adjusted that value in calculations.

Here is KeyboardHeightProvider.java :

import android.app.Activity;
import android.content.res.Configuration;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.ColorDrawable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.WindowManager.LayoutParams;
import android.widget.PopupWindow;


/**
 * The keyboard height provider, this class uses a PopupWindow
 * to calculate the window height when the floating keyboard is opened and closed. 
 */
public class KeyboardHeightProvider extends PopupWindow {

    /** The tag for logging purposes */
    private final static String TAG = "sample_KeyboardHeightProvider";

    /** The keyboard height observer */
    private KeyboardHeightObserver observer;

    /** The cached landscape height of the keyboard */
    private int keyboardLandscapeHeight;

    /** The cached portrait height of the keyboard */
    private int keyboardPortraitHeight;

    /** The view that is used to calculate the keyboard height */
    private View popupView;

    /** The parent view */
    private View parentView;

    /** The root activity that uses this KeyboardHeightProvider */
    private Activity activity;

    /** 
     * Construct a new KeyboardHeightProvider
     * 
     * @param activity The parent activity
     */
    public KeyboardHeightProvider(Activity activity) {
        super(activity);
        this.activity = activity;

        LayoutInflater inflator = (LayoutInflater) activity.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        this.popupView = inflator.inflate(R.layout.popupwindow, null, false);
        setContentView(popupView);

        setSoftInputMode(LayoutParams.SOFT_INPUT_ADJUST_RESIZE | LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
        setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);

        parentView = activity.findViewById(android.R.id.content);

        setWidth(0);
        setHeight(LayoutParams.MATCH_PARENT);

        popupView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

                @Override
                public void onGlobalLayout() {
                    if (popupView != null) {
                        handleOnGlobalLayout();
                    }
                }
            });
    }

    /**
     * Start the KeyboardHeightProvider, this must be called after the onResume of the Activity.
     * PopupWindows are not allowed to be registered before the onResume has finished
     * of the Activity.
     */
    public void start() {

        if (!isShowing() && parentView.getWindowToken() != null) {
            setBackgroundDrawable(new ColorDrawable(0));
            showAtLocation(parentView, Gravity.NO_GRAVITY, 0, 0);
        }
    }

    /**
     * Close the keyboard height provider, 
     * this provider will not be used anymore.
     */
    public void close() {
        this.observer = null;
        dismiss();
    }

    /** 
     * Set the keyboard height observer to this provider. The 
     * observer will be notified when the keyboard height has changed. 
     * For example when the keyboard is opened or closed.
     * 
     * @param observer The observer to be added to this provider.
     */
    public void setKeyboardHeightObserver(KeyboardHeightObserver observer) {
        this.observer = observer;
    }

    /**
     * Get the screen orientation
     *
     * @return the screen orientation
     */
    private int getScreenOrientation() {
        return activity.getResources().getConfiguration().orientation;
    }

    /**
     * Popup window itself is as big as the window of the Activity. 
     * The keyboard can then be calculated by extracting the popup view bottom 
     * from the activity window height. 
     */
    private void handleOnGlobalLayout() {

        Point screenSize = new Point();
        activity.getWindowManager().getDefaultDisplay().getSize(screenSize);

        Rect rect = new Rect();
        popupView.getWindowVisibleDisplayFrame(rect);

        // REMIND, you may like to change this using the fullscreen size of the phone
        // and also using the status bar and navigation bar heights of the phone to calculate
        // the keyboard height. But this worked fine on a Nexus.
        int orientation = getScreenOrientation();
        int keyboardHeight = screenSize.y - rect.bottom;

        if (keyboardHeight == 0) {
            notifyKeyboardHeightChanged(0, orientation);
        }
        else if (orientation == Configuration.ORIENTATION_PORTRAIT) {
            this.keyboardPortraitHeight = keyboardHeight; 
            notifyKeyboardHeightChanged(keyboardPortraitHeight, orientation);
        } 
        else {
            this.keyboardLandscapeHeight = keyboardHeight; 
            notifyKeyboardHeightChanged(keyboardLandscapeHeight, orientation);
        }
    }

    /**
     *
     */
    private void notifyKeyboardHeightChanged(int height, int orientation) {
        if (observer != null) {
            observer.onKeyboardHeightChanged(height, orientation);
        }
    }

    public interface KeyboardHeightObserver {
        void onKeyboardHeightChanged(int height, int orientation);
    }
}

popupwindow.xml :

<?xml version="1.0" encoding="utf-8"?>
<View
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/popuplayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/transparent"
    android:orientation="horizontal"/>

Usage in MainActivity

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*

/**
 * Created by nileshdeokar on 22/02/2018.
 */
class MainActivity : AppCompatActivity() , KeyboardHeightProvider.KeyboardHeightObserver  {

    private lateinit var keyboardHeightProvider : KeyboardHeightProvider


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        keyboardHeightProvider = KeyboardHeightProvider(this)
        parentActivityView.post { keyboardHeightProvider?.start() }
    }

    override fun onKeyboardHeightChanged(height: Int, orientation: Int) {
        // In case of 18:9 - e.g. Samsung S8
        // here you get the height of the navigation bar as negative value when keyboard is closed.
        // and some positive integer when keyboard is opened.
    }

    public override fun onPause() {
        super.onPause()
        keyboardHeightProvider?.setKeyboardHeightObserver(null)
    }

    public override fun onResume() {
        super.onResume()
        keyboardHeightProvider?.setKeyboardHeightObserver(this)
    }

    public override fun onDestroy() {
        super.onDestroy()
        keyboardHeightProvider?.close()
    }
}

For any further help you can have a look at advanced usage of this here.

Assert equals between 2 Lists in Junit

For JUnit 5

you can use assertIterableEquals :

List<String> numbers = Arrays.asList("one", "two", "three");
List<String> numbers2 = Arrays.asList("one", "two", "three");

Assertions.assertIterableEquals(numbers, numbers2);

or assertArrayEquals and converting lists to arrays :

List<String> numbers = Arrays.asList("one", "two", "three");
List<String> numbers2 = Arrays.asList("one", "two", "three");
Assertions.assertArrayEquals(numbers.toArray(), numbers2.toArray());

How to list all the roles existing in Oracle database?

Got the answer :

SELECT * FROM DBA_ROLES;

How to select rows where column value IS NOT NULL using CodeIgniter's ActiveRecord?

Much better to use following:

For is not null:

where('archived IS NOT NULL', null);

For is null:

where('archived', null);

Get a worksheet name using Excel VBA

This works for me.

worksheetName = ActiveSheet.Name

How do I center list items inside a UL element?

Another way to do this:

<ul>
  <li>One</li>
  <li>Two</li>
  <li>Three</li>
</ul>

ul {
  width: auto;
  display: table;
  margin-left: auto;
  margin-right: auto;
}

ul li {
  float: left;
  list-style: none;
  margin-right: 1rem;
}

http://jsfiddle.net/f6qgf24m/

Setting an int to Infinity in C++

Integers are inherently finite. The closest you can get is by setting a to int's maximum value:

#include <limits>

// ...

int a = std::numeric_limits<int>::max();

Which would be 2^31 - 1 (or 2 147 483 647) if int is 32 bits wide on your implementation.

If you really need infinity, use a floating point number type, like float or double. You can then get infinity with:

double a = std::numeric_limits<double>::infinity();

Auto height of div

div's will naturally resize in accordance with their content.

If you set no height on your div, it will expand to contain its conent.

An exception to this rule is when the div contains floating elements. If this is the case you'll need to do a bit extra to ensure that the containing div (wrapper) clears the floats.

Here's some ways to do this:

#wrapper{
overflow:hidden;
}

#wrapper:after
{
content:".";
display:block;
clear:both;
visibility:hidden;
}

How to embed a Facebook page's feed into my website

For website developers, another option you have is to follow a working Facebook Graph API tutorial such as this one.

But if you need a quick solution where you can customize and embed a Facebook page feed instantly, you should use website plugins such as this one.

Here's a step by step guide:

Get a Free Key or Paid Key.
Go to this login page and use the key to login.
Once logged in, click “+ Create Custom Feed” button.
On the pop up, name your custom Facebook page feed.
On the drop-down, select “Facebook Page Feed On Your Website” option.
Enter your Facebook Page ID.
Click the “Proceed” button. This will show you the customization options.
Click the “ Embed On Website” button located on the upper-right corner of the screen.
On the pop up, copy the embed code by clicking the “Copy Code” button.
Paste the embed code on your website.

Visit the tutorial link to see a live demo there as well.

Regex to match URL end-of-line or "/" character

To match either / or end of content, use (/|\z)

This only applies if you are not using multi-line matching (i.e. you're matching a single URL, not a newline-delimited list of URLs).

To put that with an updated version of what you had:

/(\S+?)/(\d{4}-\d{2}-\d{2})-(\d+)(/|\z)

Note that I've changed the start to be a non-greedy match for non-whitespace ( \S+? ) rather than matching anything and everything ( .* )

Swift presentViewController

I had a similar issue but in my case, the solution was to dispatch the action as an async task in the main queue

DispatchQueue.main.async {
    let vc = self.storyboard?.instantiateViewController(withIdentifier: myVCID) as! myVCName
    self.present(vc, animated: true, completion: nil)
}

How to print environment variables to the console in PowerShell?

Prefix the variable name with env:

$env:path

For example, if you want to print the value of environment value "MINISHIFT_USERNAME", then command will be:

$env:MINISHIFT_USERNAME

You can also enumerate all variables via the env drive:

Get-ChildItem env:

sql primary key and index

NOTE: This answer addresses enterprise-class development in-the-large.

This is an RDBMS issue, not just SQL Server, and the behavior can be very interesting. For one, while it is common for primary keys to be automatically (uniquely) indexed, it is NOT absolute. There are times when it is essential that a primary key NOT be uniquely indexed.

In most RDBMSs, a unique index will automatically be created on a primary key if one does not already exist. Therefore, you can create your own index on the primary key column before declaring it as a primary key, then that index will be used (if acceptable) by the database engine when you apply the primary key declaration. Often, you can create the primary key and allow its default unique index to be created, then create your own alternate index on that column, then drop the default index.

Now for the fun part--when do you NOT want a unique primary key index? You don't want one, and can't tolerate one, when your table acquires enough data (rows) to make the maintenance of the index too expensive. This varies based on the hardware, the RDBMS engine, characteristics of the table and the database, and the system load. However, it typically begins to manifest once a table reaches a few million rows.

The essential issue is that each insert of a row or update of the primary key column results in an index scan to ensure uniqueness. That unique index scan (or its equivalent in whichever RDBMS) becomes much more expensive as the table grows, until it dominates the performance of the table.

I have dealt with this issue many times with tables as large as two billion rows, 8 TBs of storage, and forty million row inserts per day. I was tasked to redesign the system involved, which included dropping the unique primary key index practically as step one. Indeed, dropping that index was necessary in production simply to recover from an outage, before we even got close to a redesign. That redesign included finding other ways to ensure the uniqueness of the primary key and to provide quick access to the data.

Android: ListView elements with multiple clickable buttons

I am not sure about be the best way, but works fine and all code stays in your ArrayAdapter.

package br.com.fontolan.pessoas.arrayadapter;

import java.util.List;

import android.content.Context;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import br.com.fontolan.pessoas.R;
import br.com.fontolan.pessoas.model.Telefone;

public class TelefoneArrayAdapter extends ArrayAdapter<Telefone> {

private TelefoneArrayAdapter telefoneArrayAdapter = null;
private Context context;
private EditText tipoEditText = null;
private EditText telefoneEditText = null;
private ImageView deleteImageView = null;

public TelefoneArrayAdapter(Context context, List<Telefone> values) {
    super(context, R.layout.telefone_form, values);
    this.telefoneArrayAdapter = this;
    this.context = context;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = inflater.inflate(R.layout.telefone_form, parent, false);

    tipoEditText = (EditText) view.findViewById(R.id.telefone_form_tipo);
    telefoneEditText = (EditText) view.findViewById(R.id.telefone_form_telefone);
    deleteImageView = (ImageView) view.findViewById(R.id.telefone_form_delete_image);

    final int i = position;
    final Telefone telefone = this.getItem(position);
    tipoEditText.setText(telefone.getTipo());
    telefoneEditText.setText(telefone.getTelefone());

    TextWatcher tipoTextWatcher = new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void afterTextChanged(Editable s) {
            telefoneArrayAdapter.getItem(i).setTipo(s.toString());
            telefoneArrayAdapter.getItem(i).setIsDirty(true);
        }
    };

    TextWatcher telefoneTextWatcher = new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void afterTextChanged(Editable s) {
            telefoneArrayAdapter.getItem(i).setTelefone(s.toString());
            telefoneArrayAdapter.getItem(i).setIsDirty(true);
        }
    };

    tipoEditText.addTextChangedListener(tipoTextWatcher);
    telefoneEditText.addTextChangedListener(telefoneTextWatcher);

    deleteImageView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            telefoneArrayAdapter.remove(telefone);
        }
    });

    return view;
}

}

IDEA: javac: source release 1.7 requires target release 1.7

I ran into this and the fix was to go to Project Settings > Modules > click on the particular module > Dependencies tab. I noticed the Module SDK was still set on 1.6, I changed it to 1.7 and it worked.

How can I quantify difference between two images?

Another nice, simple way to measure the similarity between two images:

import sys
from skimage.measure import compare_ssim
from skimage.transform import resize
from scipy.ndimage import imread

# get two images - resize both to 1024 x 1024
img_a = resize(imread(sys.argv[1]), (2**10, 2**10))
img_b = resize(imread(sys.argv[2]), (2**10, 2**10))

# score: {-1:1} measure of the structural similarity between the images
score, diff = compare_ssim(img_a, img_b, full=True)
print(score)

If others are interested in a more powerful way to compare image similarity, I put together a tutorial and web app for measuring and visualizing similar images using Tensorflow.

Python - difference between two strings

The answer to my comment above on the Original Question makes me think this is all he wants:

loopnum = 0
word = 'afrykanerskojezyczny'
wordlist = ['afrykanerskojezycznym','afrykanerskojezyczni','nieafrykanerskojezyczni']
for i in wordlist:
    wordlist[loopnum] = word
    loopnum += 1

This will do the following:

For every value in wordlist, set that value of the wordlist to the origional code.

All you have to do is put this piece of code where you need to change wordlist, making sure you store the words you need to change in wordlist, and that the original word is correct.

Hope this helps!

How to invoke a Linux shell command from Java

Building on @Tim's example to make a self-contained method:

import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class Shell {

    /** Returns null if it failed for some reason.
     */
    public static ArrayList<String> command(final String cmdline,
    final String directory) {
        try {
            Process process = 
                new ProcessBuilder(new String[] {"bash", "-c", cmdline})
                    .redirectErrorStream(true)
                    .directory(new File(directory))
                    .start();

            ArrayList<String> output = new ArrayList<String>();
            BufferedReader br = new BufferedReader(
                new InputStreamReader(process.getInputStream()));
            String line = null;
            while ( (line = br.readLine()) != null )
                output.add(line);

            //There should really be a timeout here.
            if (0 != process.waitFor())
                return null;

            return output;

        } catch (Exception e) {
            //Warning: doing this is no good in high quality applications.
            //Instead, present appropriate error messages to the user.
            //But it's perfectly fine for prototyping.

            return null;
        }
    }

    public static void main(String[] args) {
        test("which bash");

        test("find . -type f -printf '%T@\\\\t%p\\\\n' "
            + "| sort -n | cut -f 2- | "
            + "sed -e 's/ /\\\\\\\\ /g' | xargs ls -halt");

    }

    static void test(String cmdline) {
        ArrayList<String> output = command(cmdline, ".");
        if (null == output)
            System.out.println("\n\n\t\tCOMMAND FAILED: " + cmdline);
        else
            for (String line : output)
                System.out.println(line);

    }
}

(The test example is a command that lists all files in a directory and its subdirectories, recursively, in chronological order.)

By the way, if somebody can tell me why I need four and eight backslashes there, instead of two and four, I can learn something. There is one more level of unescaping happening than what I am counting.

Edit: Just tried this same code on Linux, and there it turns out that I need half as many backslashes in the test command! (That is: the expected number of two and four.) Now it's no longer just weird, it's a portability problem.

How to increase Bootstrap Modal Width?

I know this is old, but to anyone looking, you now need to set the max-width property.

.modal-1000 {
    max-width: 1000px;
    margin: 30px auto;
}

Performing user authentication in Java EE / JSF using j_security_check

It should be mentioned that it is an option to completely leave authentication issues to the front controller, e.g. an Apache Webserver and evaluate the HttpServletRequest.getRemoteUser() instead, which is the JAVA representation for the REMOTE_USER environment variable. This allows also sophisticated log in designs such as Shibboleth authentication. Filtering Requests to a servlet container through a web server is a good design for production environments, often mod_jk is used to do so.

res.sendFile absolute path

process.cwd() returns the absolute path of your project.

Then :

res.sendFile( `${process.cwd()}/public/index1.html` );

Best lightweight web server (only static content) for Windows

Have a look at mongoose:

single executable
very small memory footprint
allows multiple worker threads
easy to install as service
configurable with a configuration file if required

get Context in non-Activity class

If your class is non-activity class, and creating an instance of it from the activiy, you can pass an instance of context via constructor of the later as follows:

class YourNonActivityClass{

// variable to hold context
private Context context;

//save the context recievied via constructor in a local variable

public YourNonActivityClass(Context context){
    this.context=context;
}

}

You can create instance of this class from the activity as follows:

new YourNonActivityClass(this);

How to get a function name as a string?

my_function.__name__

Using __name__ is the preferred method as it applies uniformly. Unlike func_name, it works on built-in functions as well:

>>> import time
>>> time.time.func_name
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
AttributeError: 'builtin_function_or_method' object has no attribute 'func_name'
>>> time.time.__name__ 
'time'

Also the double underscores indicate to the reader this is a special attribute. As a bonus, classes and modules have a __name__ attribute too, so you only have remember one special name.

Is there any sed like utility for cmd.exe?

You could try powershell. There are get-content and set-content commandlets build in that you could use.

is it possible to get the MAC address for machine using nmap

Just the standard scan will return the MAC.

nmap -sS target

How to make Firefox headless programmatically in Selenium with Python?

Used below code to set driver type based on need of Headless / Head for both Firefox and chrome:

// Can pass browser type 

if brower.lower() == 'chrome':
    driver = webdriver.Chrome('..\drivers\chromedriver')
elif brower.lower() == 'headless chrome':
    ch_Options = Options()
    ch_Options.add_argument('--headless')
    ch_Options.add_argument("--disable-gpu")
    driver = webdriver.Chrome('..\drivers\chromedriver',options=ch_Options)
elif brower.lower() == 'firefox':
    driver = webdriver.Firefox(executable_path=r'..\drivers\geckodriver.exe')
elif brower.lower() == 'headless firefox':
    ff_option = FFOption()
    ff_option.add_argument('--headless')
    ff_option.add_argument("--disable-gpu")
    driver = webdriver.Firefox(executable_path=r'..\drivers\geckodriver.exe', options=ff_option)
elif brower.lower() == 'ie':
    driver = webdriver.Ie('..\drivers\IEDriverServer')
else:
    raise Exception('Invalid Browser Type')

How to change lowercase chars to uppercase using the 'keyup' event?

Plain ol' javascript:

var input = document.getElementById('inputID');

input.onkeyup = function(){
    this.value = this.value.toUpperCase();
}

Javascript with jQuery:

$('#inputID').keyup(function(){
    this.value = this.value.toUpperCase();
});

What is the simplest jQuery way to have a 'position:fixed' (always at top) div?

Beautiful! Your solution was 99%... instead of "this.scrollY", I used "$(window).scrollTop()". What's even better is that this solution only requires the jQuery1.2.6 library (no additional libraries needed).

The reason I wanted that version in particular is because that's what ships with MVC currently.

Here's the code:

$(document).ready(function() {
    $("#topBar").css("position", "absolute");
});

$(window).scroll(function() {
    $("#topBar").css("top", $(window).scrollTop() + "px");
});

WCF Error - Could not find default endpoint element that references contract 'UserService.UserService'

Just in case anyone hits the same problem whilst using WPF (rather than WCF or Silverlight):

I had this error, when connecting to a Web Service. When my code was in the "main" WPF Application solution, no problem, it worked perfectly. But when I moved the code to the more sensible DAL-layer solution, it would throw the exception.

Could not find default endpoint element that references contract 'MyWebService.MyServiceSoap' in the ServiceModel client configuration section. This might be because no configuration file was found for your application, or because no endpoint element matching this contract could be found in the client element.

As has been stated by "Sprite" in this thread, you need to manually copy the tag.

For WPF apps, this means copying the tag from the app.config in my DAL solution to the app.config in the main WPF Application solution.

Excel error HRESULT: 0x800A03EC while trying to get range with cell's name

Using Dominic's answer I found the answer to my problem specifically was an invalid DateTiime in the source data before it was applied to the range. Somewhere between the database, .NET and Excel the conversion of the date defaulted down to "1/1/1899 12:00:00 AM". I had to check it and convert it to an empty string and it fixed it for me.

if (objectArray[row, col].ToString() == "1/1/1899 12:00:00 AM")
{
    objectArray[row, col] = string.Empty;
}

This is probably a pretty specific example but hopefully it will save somebody else some time if they are trying to track down a piece of invalid data.

How to locate the php.ini file (xampp)

as KingCrunch pointed out, using phpinfo you can see what config file is in action in the "Loaded Configuration File" row. in my case in was in C:\xampp\apache\bin note that there is a php.ini also in C:\xampp\php which seems to be redundant and irrelevant

RuntimeError on windows trying python multiprocessing

hello here is my structure for multi process

from multiprocessing import Process
import time


start = time.perf_counter()


def do_something(time_for_sleep):
    print(f'Sleeping {time_for_sleep} second...')
    time.sleep(time_for_sleep)
    print('Done Sleeping...')



p1 = Process(target=do_something, args=[1])
p2 = Process(target=do_something, args=[2])


if 

__name__ == '__main__':
    p1.start()
    p2.start()

    p1.join()
    p2.join()

    finish = time.perf_counter()
    print(f'Finished in {round(finish-start,2 )} second(s)')

you don't have to put imports in the name == 'main', just running the program you wish to running inside

How to set top-left alignment for UILabel for iOS application?

I have this problem to but my label was in UITableViewCell, and in fund that the easiest way to solve the problem was to create an empty UIView and set the label inside it with constraints to the top and to the left side only, on off curse set the number of lines to 0

Convert varchar to float IF ISNUMERIC

-- TRY THIS --

select name= case when isnumeric(empname)= 1 then 'numeric' else 'notmumeric' end from [Employees]

But conversion is quit impossible

select empname=
case
when isnumeric(empname)= 1 then empname
else 'notmumeric'
end
from [Employees]

Dropping connected users in Oracle database

go to services in administrative tools and select oracleserviceSID and restart it

Warning comparison between pointer and integer

In this line ...

if (*message == "\0") {

... as you can see in the warning ...

warning: comparison between pointer and integer
      ('int' and 'char *')

... you are actually comparing an int with a char *, or more specifically, an int with an address to a char.

To fix this, use one of the following:

if(*message == '\0') ...
if(message[0] == '\0') ...
if(!*message) ...

On a side note, if you'd like to compare strings you should use strcmp or strncmp, found in string.h.

How to extend available properties of User.Identity

Whenever you want to extend the properties of User.Identity with any additional properties like the question above, add these properties to the ApplicationUser class first like so:

public class ApplicationUser : IdentityUser
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        // Add custom user claims here
        return userIdentity;
    }

    // Your Extended Properties
    public long? OrganizationId { get; set; }
}

Then what you need is to create an extension method like so (I create mine in an new Extensions folder):

namespace App.Extensions
{
    public static class IdentityExtensions
    {
        public static string GetOrganizationId(this IIdentity identity)
        {
            var claim = ((ClaimsIdentity)identity).FindFirst("OrganizationId");
            // Test for null to avoid issues during local testing
            return (claim != null) ? claim.Value : string.Empty;
        }
    }
}

When you create the Identity in the ApplicationUser class, just add the Claim -> OrganizationId like so:

    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        // Add custom user claims here => this.OrganizationId is a value stored in database against the user
        userIdentity.AddClaim(new Claim("OrganizationId", this.OrganizationId.ToString()));

        return userIdentity;
    }

Once you added the claim and have your extension method in place, to make it available as a property on your User.Identity, add a using statement on the page/file you want to access it:

in my case: using App.Extensions; within a Controller and @using. App.Extensions withing a .cshtml View file.

EDIT:

What you can also do to avoid adding a using statement in every View is to go to the Views folder, and locate the Web.config file in there. Now look for the <namespaces> tag and add your extension namespace there like so:

<add namespace="App.Extensions" />

Save your file and you're done. Now every View will know of your extensions.

You can access the Extension Method:

var orgId = User.Identity.GetOrganizationId();

How do you do dynamic / dependent drop downs in Google Sheets?

Here you have another solution based on the one provided by @tarheel

function onEdit() {
    var sheetWithNestedSelectsName = "Sitemap";
    var columnWithNestedSelectsRoot = 1;
    var sheetWithOptionPossibleValuesSuffix = "TabSections";

    var activeSpreadsheet = SpreadsheetApp.getActiveSpreadsheet();
    var activeSheet = SpreadsheetApp.getActiveSheet();

    // If we're not in the sheet with nested selects, exit!
    if ( activeSheet.getName() != sheetWithNestedSelectsName ) {
        return;
    }

    var activeCell = SpreadsheetApp.getActiveRange();

    // If we're not in the root column or a content row, exit!
    if ( activeCell.getColumn() != columnWithNestedSelectsRoot || activeCell.getRow() < 2 ) {
        return;
    }

    var sheetWithActiveOptionPossibleValues = activeSpreadsheet.getSheetByName( activeCell.getValue() + sheetWithOptionPossibleValuesSuffix );

    // Get all possible values
    var activeOptionPossibleValues = sheetWithActiveOptionPossibleValues.getSheetValues( 1, 1, -1, 1 );

    var possibleValuesValidation = SpreadsheetApp.newDataValidation();
    possibleValuesValidation.setAllowInvalid( false );
    possibleValuesValidation.requireValueInList( activeOptionPossibleValues, true );

    activeSheet.getRange( activeCell.getRow(), activeCell.getColumn() + 1 ).setDataValidation( possibleValuesValidation.build() );
}

It has some benefits over the other approach:

You don't need to edit the script every time you add a "root option". You only have to create a new sheet with the nested options of this root option.
I've refactored the script providing more semantic names for the variables and so on. Furthermore, I've extracted some parameters to variables in order to make it easier to adapt to your specific case. You only have to set the first 3 values.
There's no limit of nested option values (I've used the getSheetValues method with the -1 value).

So, how to use it:

Create the sheet where you'll have the nested selectors
Go to the "Tools" > "Script Editor…" and select the "Blank project" option
Paste the code attached to this answer
Modify the first 3 variables of the script setting up your values and save it
Create one sheet within this same document for each possible value of the "root selector". They must be named as the value + the specified suffix.

Enjoy!

Get HTML inside iframe using jQuery

This line will retrieve the whole HTML code of the frame. By using other methods instead of innerHTML you can traverse DOM of the inner document.

document.getElementById('iframe').contentWindow.document.body.innerHTML

Thing to remember is that this will work only if the frame source is on the same domain. If it is from a different domain, cross-site-scripting (XSS) protection will kick in.

How to uninstall a package installed with pip install --user

Having tested this using Python 3.5 and pip 7.1.2 on Linux, the situation appears to be this:

pip install --user somepackage installs to $HOME/.local, and uninstalling it does work using pip uninstall somepackage.
This is true whether or not somepackage is also installed system-wide at the same time.
If the package is installed at both places, only the local one will be uninstalled. To uninstall the package system-wide using pip, first uninstall it locally, then run the same uninstall command again, with root privileges.
In addition to the predefined user install directory, pip install --target somedir somepackage will install the package into somedir. There is no way to uninstall a package from such a place using pip. (But there is a somewhat old unmerged pull request on Github that implements pip uninstall --target.)
Since the only places pip will ever uninstall from are system-wide and predefined user-local, you need to run pip uninstall as the respective user to uninstall from a given user's local install directory.

Combine two ActiveRecord::Relation objects

This is how I've "handled" it if you use pluck to get an identifier for each of the records, join the arrays together and then finally do a query for those joined ids:

  transaction_ids = @club.type_a_trans.pluck(:id) + @club.type_b_transactions.pluck(:id) + @club.type_c_transactions.pluck(:id)
  @transactions = Transaction.where(id: transaction_ids).limit(100)

Find object in list that has attribute equal to some value (that meets any condition)

You could also implement rich comparison via __eq__ method for your Test class and use in operator. Not sure if this is the best stand-alone way, but in case if you need to compare Test instances based on value somewhere else, this could be useful.

class Test:
    def __init__(self, value):
        self.value = value

    def __eq__(self, other):
        """To implement 'in' operator"""
        # Comparing with int (assuming "value" is int)
        if isinstance(other, int):
            return self.value == other
        # Comparing with another Test object
        elif isinstance(other, Test):
            return self.value == other.value

import random

value = 5

test_list = [Test(random.randint(0,100)) for x in range(1000)]

if value in test_list:
    print "i found it"

How to check a boolean condition in EL?

You can have a look at the EL (expression language) description here.

Both your code are correct, but I prefer the second one, as comparing a boolean to true or false is redundant.

For better readibility, you can also use the not operator:

<c:if test="${not theBooleanVariable}">It's false!</c:if>

Javascript require() function giving ReferenceError: require is not defined

require is part of the Asynchronous Module Definition (AMD) API.

A browser implementation can be found via require.js and native support can be found in node.js.

The documentation for the library you are using should tell you what you need to use it, I suspect that it is intended to run under Node.js and not in browsers.

Can't access Tomcat using IP address

Check your windows-firewall feature in control panel. Outbound and inbound port should allow port 8089. (or write a new rule for this- Right hand side, actions - new rules.) it worked for me!

How does HTTP file upload work?

Let's take a look at what happens when you select a file and submit your form (I've truncated the headers for brevity):

POST /upload?upload_progress_id=12344 HTTP/1.1
Host: localhost:3000
Content-Length: 1325
Origin: http://localhost:3000
... other headers ...
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryePkpFF7tjBAqx29L

------WebKitFormBoundaryePkpFF7tjBAqx29L
Content-Disposition: form-data; name="MAX_FILE_SIZE"

100000
------WebKitFormBoundaryePkpFF7tjBAqx29L
Content-Disposition: form-data; name="uploadedfile"; filename="hello.o"
Content-Type: application/x-object

... contents of file goes here ...
------WebKitFormBoundaryePkpFF7tjBAqx29L--

NOTE: each boundary string must be prefixed with an extra --, just like in the end of the last boundary string. The example above already includes this, but it can be easy to miss. See comment by @Andreas below.

Instead of URL encoding the form parameters, the form parameters (including the file data) are sent as sections in a multipart document in the body of the request.

In the example above, you can see the input MAX_FILE_SIZE with the value set in the form, as well as a section containing the file data. The file name is part of the Content-Disposition header.

The full details are here.

How to allow all Network connection types HTTP and HTTPS in Android (9) Pie?

The FULLY WORKING SOLUTION for both Android or React-native users facing this issue just add this android:usesCleartextTraffic="true" in AndroidManifest.xml file like this:

android:usesCleartextTraffic="true"
tools:ignore="GoogleAppIndexingWarning">
<uses-library
    android:name="org.apache.http.legacy"
    android:required="false" />

in between <application>.. </application> tag like this:

<application
      android:name=".MainApplication"
      android:label="@string/app_name"
      android:icon="@mipmap/ic_launcher"
      android:allowBackup="false"
      android:theme="@style/AppTheme"
        android:usesCleartextTraffic="true"
        tools:ignore="GoogleAppIndexingWarning">
        <uses-library
            android:name="org.apache.http.legacy"
            android:required="false" />
      <activity
        android:name=".MainActivity"
        android:label="@string/app_name"/>
 </application>

Entity Framework throws exception - Invalid object name 'dbo.BaseCs'

EF is looking for a table named dbo.BaseCs. Might be an entity name pluralizing issue. Check out this link.

EDIT: Updated link.

IndexError: list index out of range and python

If you have a list with 53 items, the last one is thelist[52] because indexing starts at 0.

`IndexError`

Attribution to Real Python: Understanding the Python Traceback - IndexError

The IndexError is raised when attempting to retrieve an index from a sequence (e.g. list, tuple), and the index isn’t found in the sequence. The Python documentation defines when this exception is raised:

Raised when a sequence subscript is out of range. (Source)

Here’s an example that raises the IndexError:

test = list(range(53))
test[53]

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
<ipython-input-6-7879607f7f36> in <module>
      1 test = list(range(53))
----> 2 test[53]

IndexError: list index out of range

The error message line for an IndexError doesn’t provide great information. See that there is a sequence reference that is out of range and what the type of the sequence is, a list in this case. That information, combined with the rest of the traceback, is usually enough to help quickly identify how to fix the issue.

How do I write a backslash (\) in a string?

To escape the backslash, simply use 2 of them, like this: \\

If you need to escape other things, this may be helpful..

I need an unordered list without any bullets

You can hide them using ::marker pseudo-element.

Transparent ::marker

ul li::marker {
  color: transparent;
}

_x000D_

ul li::marker {
  color: transparent;
}

ul {
  padding-inline-start: 10px; /* Just to reset the browser initial padding */
}

_x000D_

<ul>
  <li> Bullets are bothersome </li>
  <li> I want to remove them. </li>
  <li> Hey! ::marker to the rescue </li>
</ul>

_x000D_

::marker empty content

ul li::marker {
  content: "";
}

_x000D_

ul li::marker {
   content: "";
}

_x000D_

<ul>
  <li> Bullets are bothersome </li>
  <li> I want to remove them </li>
  <li> Hey! ::marker to the rescue </li>
</ul>

_x000D_

It is better when you need to remove bullets from a specific list item.

ul li:nth-child(n)::marker { /* Replace n with the list item's position*/
   content: "";
}

_x000D_

ul li:not(:nth-child(2))::marker {
   content: "";
}

_x000D_

<ul>
  <li> Bullets are bothersome </li>
  <li> But I can live with it using ::marker </li>
  <li> Not again though </li>
</ul>

_x000D_

Laravel Advanced Wheres how to pass variable into function?

You can pass variables using this...

$status =1;
 $info = JOBS::where(function($query) use ($status){        
         $query->where('status',$status);
         })->get();
print_r($info);

Javascript change date into format of (dd/mm/yyyy)

This will ensure you get a two-digit day and month.

function formattedDate(d = new Date) {
  let month = String(d.getMonth() + 1);
  let day = String(d.getDate());
  const year = String(d.getFullYear());

  if (month.length < 2) month = '0' + month;
  if (day.length < 2) day = '0' + day;

  return `${day}/${month}/${year}`;
}

Or terser:

function formattedDate(d = new Date) {
  return [d.getDate(), d.getMonth()+1, d.getFullYear()]
      .map(n => n < 10 ? `0${n}` : `${n}`).join('/');
}

How to set image to fit width of the page using jsPDF?

        var width = doc.internal.pageSize.width;    
        var height = doc.internal.pageSize.height;

JavaScript operator similar to SQL "like"

No, there isn't any.

The list of comparison operators are listed here.

Comparison Operators

For your requirement the best option would be regular expressions.

DISTINCT for only one column

The reason DISTINCT and GROUP BY work on entire rows is that your query returns entire rows.

To help you understand: Try to write out by hand what the query should return and you will see that it is ambiguous what to put in the non-duplicated columns.

If you literally don't care what is in the other columns, don't return them. Returning a random row for each e-mail address seems a little useless to me.

How do I declare class-level properties in Objective-C?

If you're looking for the class-level equivalent of @property, then the answer is "there's no such thing". But remember, @property is only syntactic sugar, anyway; it just creates appropriately-named object methods.

You want to create class methods that access static variables which, as others have said, have only a slightly different syntax.

Does Python have a toString() equivalent, and can I convert a db.Model element to String?

str() is the equivalent.

However you should be filtering your query. At the moment your query is all() Todo's.

todos = Todo.all().filter('author = ', users.get_current_user().nickname())

todos = Todo.all().filter('author = ', users.get_current_user())

depending on what you are defining author as in the Todo model. A StringProperty or UserProperty.

Note nickname is a method. You are passing the method and not the result in template values.

Programs & Examples On #Generic programming

Generics/templates in python?

multiple packages in context:component-scan, spring config

Git for beginners: The definitive practical guide

How to set the part of the text view is clickable

display Java.util.Date in a specific format

Encode String to UTF-8

d3 add text to circle

syntax error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING

How to set aliases in the Git Bash for Windows?

Convert array to string in NodeJS

rails 3 validation on uniqueness on multiple attributes

Maven Error: Could not find or load main class

Error:Conflict with dependency 'com.google.code.findbugs:jsr305'

How to break out of a loop from inside a switch?

How to set a:link height/width with css?

Get only specific attributes with from Laravel Collection

How do I discover memory usage of my application in Android?

How do I get the dialer to open with phone number displayed?

Android: How to add R.raw to project?

How can I sort a std::map first by value, then by key?

Print an integer in binary format in Java

Can Keras with Tensorflow backend be forced to use CPU or GPU at will?

MySql: Tinyint (2) vs tinyint(1) - what is the difference?

Hash Table/Associative Array in VBA

null terminating a string

Get error message if ModelState.IsValid fails?

How to automatically insert a blank row after a group of data

JAX-RS — How to return JSON and HTTP status code together?

When to use an interface instead of an abstract class and vice versa?

How to do HTTP authentication in android?

Python Pandas: How to read only first n rows of CSV files in?

What is the difference between attribute and property?

Enter key in textarea

Difference between RUN and CMD in a Dockerfile

Replacing few values in a pandas dataframe column with another value

How to extract multiple JSON objects from one file?

How to use ADB in Android Studio to view an SQLite DB

How can I tell when HttpClient has timed out?

Multiple files upload (Array) with CodeIgniter 2.0

How to set focus on input field?

UIView frame, bounds and center

How to find the array index with a value?

Saving numpy array to txt file row wise

How can I change Eclipse theme?

git rebase fatal: Needed a single revision

What is the difference between Html.Hidden and Html.HiddenFor

What equivalents are there to TortoiseSVN, on Mac OSX?

how to File.listFiles in alphabetical order?

Forbidden You don't have permission to access / on this server

favicon.png vs favicon.ico - why should I use PNG instead of ICO?

NoSQL Use Case Scenarios or WHEN to use NoSQL

Uri not Absolute exception getting while calling Restful Webservice

No Multiline Lambda in Python: Why not?

is inaccessible due to its protection level

How to add multiple files to Git at the same time

fstream won't create a file

A better way to check if a path exists or not in PowerShell

Android Shared preferences for creating one time activity (example)

Combining multiple condition in single case statement in Sql Server

How to find all occurrences of a substring?

How to parse XML and count instances of a particular node attribute?

Best way to check if an PowerShell Object exist?

How to append a newline to StringBuilder

Is there an XSL "contains" directive?

ASP.NET MVC Ajax Error handling

Resizing image in Java

sending email via php mail function goes to spam

Try changing your headers to this:

EDIT:

PowerShell: Comparing dates

Convert character to ASCII numeric value in java

calling a function from class in python - different way

Best way to track onchange as-you-type in input type="text"?

jQuery counter to count up to a target number

Get first day of week in SQL Server

Add single element to array in numpy

How to Detect Browser Window /Tab Close Event?

I don't have "Dynamic Web Project" option in Eclipse new Project wizard

jQuery - Appending a div to body, the body is the object?

`{` will start an `object`:

`[` will start an `array`:

And `value` is an `object`, `array`, `string`, `number`, `bool` or `null`: