SyntaxFix

Programs & Examples On #Jflow

Wampserver icon not going green fully, mysql services not starting up?

I was running Wamp Server for more than a year,
Now I faced a problem that I couldn't start Wamp server (The icon just stay red and the error message appear)

I managed to uninstall Wamp and reinstall it again, and so I did, but before that I copied the folder from mysql/data to my desktop then when I reinstall it I copied that files to the original location.

Then mysql just got confused... And phpmyadmin is not working so I fixed that by restoring the fresh install folder contents..
But I couldn't start mysql (the wamp servers icon still on yellow)

So after I googled a lot, I deleted every thing in the mysql/data except for:- 

mysql
test
performance_schema

And my problem solved :)

Error: Could not create the Java Virtual Machine Mac OSX Mavericks

So try uninstalling all other versions other than the one you need, then set the JAVA_HOMEpath variable for that JDK remaining, and you're done.

That's worked for me, I have two JDK (version 8 & 11) installed on my local mac, that causes the issue, for uninstalling, I followed these two steps:

  • cd /Library/Java/JavaVirtualMachines
  • rm -rf openjdk-11.0.1.jdk

How to set cache: false in jQuery.get call

I think you have to use the AJAX method instead which allows you to turn caching off:

$.ajax({
  url: "test.html",
  data: 'foo',
  success: function(){
    alert('bar');
  },
  cache: false
});

CSS: Hover one element, effect for multiple elements?

This worked for me in Firefox and Chrome and IE8...

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 
<html>
    <head>
        <style type="text/css">
        div.section:hover div.image, div.section:hover div.layer {
            border: solid 1px red;
        }
        </style>
    </head>
    <body>
        <div class="section">
            <div class="image"><img src="myImage.jpg" /></div>
            <div class="layer">Lorem Ipsum</div>
        </div>
    </body>
</html>

... you may want to test this with IE6 as well (I'm not sure if it'll work there).

Need a good hex editor for Linux

I am a VIMer. I can do some rare Hex edits with:

  • :%!xxd to switch into hex mode

  • :%!xxd -r to exit from hex mode

But I strongly recommend ht

apt-cache show ht

Package: ht
Version: 2.0.18-1
Installed-Size: 1780
Maintainer: Alexander Reichle-Schmehl <[email protected]>

Homepage: http://hte.sourceforge.net/

Note: The package is called ht, whereas the executable is named hte after the package was installed.

  1. Supported file formats
    • common object file format (COFF/XCOFF32)
    • executable and linkable format (ELF)
    • linear executables (LE)
    • standard DO$ executables (MZ)
    • new executables (NE)
    • portable executables (PE32/PE64)
    • java class files (CLASS)
    • Mach exe/link format (MachO)
    • X-Box executable (XBE)
    • Flat (FLT)
    • PowerPC executable format (PEF)
  2. Code & Data Analyser
    • finds branch sources and destinations recursively
    • finds procedure entries
    • creates labels based on this information
    • creates xref information
    • allows to interactively analyse unexplored code
    • allows to create/rename/delete labels
    • allows to create/edit comments
    • supports x86, ia64, alpha, ppc and java code
  3. Target systems
    • DJGPP
    • GNU/Linux
    • FreeBSD
    • OpenBSD
    • Win32

MySql Error: 1364 Field 'display_name' doesn't have default value

Also, I had this issue using Laravel, but fixed by changing my database schema to allow "null" inputs on a table where I plan to collect the information from separate forms: 

public function up()
{

    Schema::create('trip_table', function (Blueprint $table) {
        $table->increments('trip_id')->unsigned();
        $table->time('est_start');
        $table->time('est_end');
        $table->time('act_start')->nullable();
        $table->time('act_end')->nullable();
        $table->date('Trip_Date');
        $table->integer('Starting_Miles')->nullable();
        $table->integer('Ending_Miles')->nullable();
        $table->string('Bus_id')->nullable();
        $table->string('Event');
        $table->string('Desc')->nullable();
        $table->string('Destination');
        $table->string('Departure_location');
        $table->text('Drivers_Comment')->nullable();
        $table->string('Requester')->nullable();
        $table->integer('driver_id')->nullable();
        $table->timestamps();
    });

}

The ->nullable(); Added to the end. This is using Laravel. Hope this helps someone, thanks!

Access restriction on class due to restriction on required library rt.jar?

Just change the order of build path libraries of your project. Right click on project>Build Path> Configure Build Path>Select Order and Export(Tab)>Change the order of the entries. I hope moving the "JRE System library" to the bottom will work. It worked so for me. Easy and simple....!!!

adding to window.onload event?

This might not be a popular option, but sometimes the scripts end up being distributed in various chunks, in that case I've found this to be a quick fix

if(window.onload != null){var f1 = window.onload;}
window.onload=function(){
    //do something

    if(f1!=null){f1();}
}

then somewhere else...

if(window.onload != null){var f2 = window.onload;}
window.onload=function(){
    //do something else

    if(f2!=null){f2();}
}

this will update the onload function and chain as needed

How to sort a Collection<T>?

You can't if T is all you get. It must be injected by the provider:

Collection<T extends Comparable>

or pass in the Comparator

Collections.sort(...)

Getting value from JQUERY datepicker

If you want to get the date when the user selects it, you can do this:

$("#datepicker").datepicker({
    onSelect: function() { 
        var dateObject = $(this).datepicker('getDate'); 
    }
});

I am not sure about the second part of your question. But, have you tried using style sheets and relative positioning?

TSQL: How to convert local time to UTC? (SQL Server 2008)

This works for dates that currently have the same UTC offset as SQL Server's host; it doesn't account for daylight savings changes. Replace YOUR_DATE with the local date to convert.

SELECT DATEADD(second, DATEDIFF(second, GETDATE(), GETUTCDATE()), YOUR_DATE);

How do you get a directory listing sorted by creation date in python?

Here's my answer using glob without filter if you want to read files with a certain extension in date order (Python 3). 

dataset_path='/mydir/'   
files = glob.glob(dataset_path+"/morepath/*.extension")   
files.sort(key=os.path.getmtime)

Python division

I'm somewhat surprised that no one has mentioned that the original poster might have liked rational numbers to result. Should you be interested in this, the Python-based program Sage has your back. (Currently still based on Python 2.x, though 3.x is under way.)

sage: (20-10) / (100-10)
1/9

This isn't a solution for everyone, because it does do some preparsing so these numbers aren't ints, but Sage Integer class elements. Still, worth mentioning as a part of the Python ecosystem.

What does $ mean before a string?

Note that you can also combine the two, which is pretty cool (although it looks a bit odd):

// simple interpolated verbatim string
WriteLine($@"Path ""C:\Windows\{file}"" not found.");

Default SQL Server Port

The default port of SQL server is 1433.

What is a MIME type?

MIME stands for Multipurpose Internet Mail Extensions. It's a way of identifying files on the Internet according to their nature and format.

For example, using the Content-type header value defined in a HTTP response, the browser can open the file with the proper extension/plugin.

Internet Media Type (also Content-type) is the same as a MIME type. MIME types were originally created for emails sent using the SMTP protocol. Nowadays, this standard is used in a lot of other protocols, hence the new naming convention "Internet Media Type".

A MIME type is a string identifier composed of two parts: a type and a subtype.

  • The "type" refers to a logical grouping of many MIME types that are closely related to each other; it's no more than a high level category.
  • "subtypes" are specific to one file type within the "type".

The x- prefix of a MIME subtype simply means that it's non-standard.
The vnd prefix means that the MIME value is vendor specific.

Source

How do you get the length of a string?

The easiest way: 

$('#selector').val().length

Java switch statement: Constant expression required, but it IS constant

In my case, I was getting this exception because

switch (tipoWebServ) {
                            case VariablesKmDialog.OBTENER_KM:
                                resultObtenerKm(result);
                                break;
                            case var.MODIFICAR_KM:
                                resultModificarKm(result);
                                break;
                        }

in the second case I was calling the constant from the instance var.MODIFICAR_KM: but I should use VariablesKmDialog.OBTENER_KM directly from the class.

Converting Decimal to Binary Java

 
    int n = 13;
    String binary = "";

    //decimal to binary
    while (n > 0) {
        int d = n & 1;
        binary = d + binary;
        n = n >> 1;
    }
    System.out.println(binary);

    //binary to decimal
    int power = 1;
    n = 0;
    for (int i = binary.length() - 1; i >= 0; i--) {
        n = n + Character.getNumericValue(binary.charAt(i)) * power;
        power = power * 2;
    }

    System.out.println(n);

ssh script returns 255 error

As @wes-floyd and @zpon wrote, add these parameters to SSH to bypass "Are you sure you want to continue connecting (yes/no)?"

-o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no

Using "-Filter" with a variable

Try this:

$NameRegex = "chalmw-dm"  
$NameR = "$($NameRegex)*"
Get-ADComputer -Filter {name -like $NameR -and Enabled -eq $True}

How do I address unchecked cast warnings?

This stuff is hard, but here are my current thoughts:

If your API returns Object, then there's nothing you can do -- no matter what, you will be blindly casting the object. You let Java throw ClassCastExceptions, or you can check each element yourself and throw Assertions or IllegalArgumentExceptions or some such, but these runtime checks are all equivalent. You have to suppress the compile time unchecked cast no matter what you do at runtime.

I'd just prefer to blind cast and let the JVM perform its runtime check for me since we "know" what the API should return, and are usually willing to assume that the API works. Use generics everywhere above the cast, if you need them. You aren't really buying anything there since you still have the single blind cast, but at least you can use generics from there on up so the JVM can help you avoid blind casts in other pieces of your code.

In this particular case, presumably you can see the call to SetAttribute and see the type is going in, so just blind-casting the type to same on the way out is not immoral. Add a comment referencing the SetAttribute and be done with it.

How to display errors on laravel 4?

Inside config folder open app.php

Change

'debug' => false,

to 

'debug' => true,

How to change the color of winform DataGridview header?

If you want to change a color to single column try this:

 dataGridView1.EnableHeadersVisualStyles = false;
 dataGridView1.Columns[0].HeaderCell.Style.BackColor = Color.Magenta;
 dataGridView1.Columns[1].HeaderCell.Style.BackColor = Color.Yellow;

'too many values to unpack', iterating over a dict. key=>string, value=>list

You want to use iteritems. This returns an iterator over the dictionary, which gives you a tuple(key, value)

>>> for field, values in fields.iteritems():
...     print field, values
... 
first_names ['foo', 'bar']
last_name ['gravy', 'snowman']

Your problem was that you were looping over fields, which returns the keys of the dictionary.

>>> for field in fields:
...     print field
... 
first_names
last_name

"Call to undefined function mysql_connect()" after upgrade to php-7

From the PHP Manual:

Warning This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide. Alternatives to this function include:

mysqli_connect()

PDO::__construct()

use MySQLi or PDO

<?php
$con = mysqli_connect('localhost', 'username', 'password', 'database');

ClassNotFoundException: org.slf4j.LoggerFactory

i know this is an old Question , but i faced this problem recently and i looked for it in google , and i came across this documentation here from slf4j website .

as it describes the following :

This error is reported when the org.slf4j.impl.StaticLoggerBinder class could not be loaded into memory. This happens when no appropriate SLF4J binding could be found on the class path.

Placing one (and only one) of slf4j-nop.jar, slf4j-simple.jar, slf4j-log4j12.jar, slf4j-jdk14.jar or logback-classic.jar on the class path should solve the problem.

SINCE 1.6.0 As of SLF4J version 1.6, in the absence of a binding, SLF4J will default to a no-operation (NOP) logger implementation.

Hope that will help someone .

How do I remove blank pages coming between two chapters in Appendix?

One thing I discovered is that using the \include command will often insert and extra blank page. Riffing on the previous trick with the \let command, I inserted \let\include\input near the beginning of the document, and that got rid of most of the excessive blank pages.

Move textfield when keyboard appears swift

There are a couple of improvements to be made on the existing answers.

Firstly the UIKeyboardWillChangeFrameNotification is probably the best notification as it handles changes that aren't just show/hide but changes due to keyboard changes (language, using 3rd party keyboards etc.) and rotations too (but note comment below indicating the keyboard will hide should also be handled to support hardware keyboard connection).

Secondly the animation parameters can be pulled from the notification to ensure that animations are properly together.

There are probably options to clean up this code a bit more especially if you are comfortable with force unwrapping the dictionary code.

 class MyViewController: UIViewController {

   // This constraint ties an element at zero points from the bottom layout guide
   @IBOutlet var keyboardHeightLayoutConstraint: NSLayoutConstraint?
 
   override func viewDidLoad() {
     super.viewDidLoad()
     NotificationCenter.default.addObserver(self,
       selector: #selector(self.keyboardNotification(notification:)),
       name: UIResponder.keyboardWillChangeFrameNotification,
       object: nil)
   }
 
   deinit {
     NotificationCenter.default.removeObserver(self)
   }
 
   @objc func keyboardNotification(notification: NSNotification) {
     guard let userInfo = notification.userInfo else { return }

     let endFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
     let endFrameY = endFrame?.origin.y ?? 0
     let duration:TimeInterval = (userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
     let animationCurveRawNSN = userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as? NSNumber
     let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIView.AnimationOptions.curveEaseInOut.rawValue
     let animationCurve:UIView.AnimationOptions = UIView.AnimationOptions(rawValue: animationCurveRaw)

     if endFrameY >= UIScreen.main.bounds.size.height {
       self.keyboardHeightLayoutConstraint?.constant = 0.0
     } else {
       self.keyboardHeightLayoutConstraint?.constant = endFrame?.size.height ?? 0.0
     }

     UIView.animate(
       withDuration: duration,
       delay: TimeInterval(0),
       options: animationCurve,
       animations: { self.view.layoutIfNeeded() },
       completion: nil)
   }
}

How to fix '.' is not an internal or external command error

I got exactly the same error in Windows 8 while trying to export decision tree digraph using tree.export_graphviz! Then I installed GraphViz from this link. And then I followed the below steps which resolved my issue:

  • Right click on My PC >> click on "Change Settings" under "Computer name, domain, and workgroup settings"
  • It will open the System Properties window; Goto 'Advanced' tab >> click on 'Environment Variables' >> Under "System Variables" >> select 'Path' and click on 'Edit' >> In 'Variable Value' field, put a semicolon (;) at the end of existing value and then include the path of its installation folder (e.g. ;C:\Program Files (x86)\Graphviz2.38\bin) >> Click on 'Ok' >> 'Ok' >> 'Ok'
  • Restart your PC as environment variables are changed

webpack is not recognized as a internal or external command,operable program or batch file

I got the same error, none of the solutions worked for me, I reinstalled node and that repaired my environment, everything works again.

nginx error:"location" directive is not allowed here in /etc/nginx/nginx.conf:76

"location" directive should be inside a 'server' directive, e.g.

server {
    listen       8765;

    location / {
        resolver 8.8.8.8;
        proxy_pass http://$http_host$uri$is_args$args;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   html;
    }
}

Lombok is not generating getter and setter

Download Lombok Jar, let’s maven do the download on our behalf :

 <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.16.18</version>
    </dependency>

Now... mvn clean install command on the newly created project to get this jar downloaded in local repository. Goto the jar location, execute the command prompt, run the command : java -jar lombok-1.16.18.jar

enter image description here

click on the “Specify Location” button and locate the eclipse.exe path LIKE : enter image description here

finally install this by clicking the “Install/Update”

How to open a new tab using Selenium WebDriver

 
// To open a new tab in an existing window
driver.findElement(By.cssSelector("body")).sendKeys(Keys.CONTROL +  "t");

Why is the console window closing immediately once displayed my output?

Instead of using

Console.Readline()
Console.Read()
Console.ReadKey()

you can run your program using Ctrl+F5 (if you are in Visual Studio). Then Visual Studio will keep the console window open, until you press a key.

Note: You cannot debug your code in this approach.

How to add constraints programmatically using Swift

 
    var xCenterConstraint : NSLayoutConstraint!
    var yCenterConstraint: NSLayoutConstraint!

 xCenterConstraint = NSLayoutConstraint(item: self.view, attribute: .CenterX, relatedBy: .Equal, toItem: (Your view NAme), attribute: .CenterX, multiplier: 1, constant: 0)
            self.view.addConstraint(xCenterConstraint)

 yCenterConstraint = NSLayoutConstraint(item: self.view, attribute: .CenterY, relatedBy: .Equal, toItem: (Your view Name), attribute: .CenterY, multiplier: 1, constant: 0)
            self.view.addConstraint(yCenterConstraint)

Docker error : no space left on device

Its may be due to the default storage space set to 40GB ( default path , /var/lib/docker)

you can change the storage volume to point to different path

  • edit file -> /etc/sysconfig/docker-storage
  • update below line (add if not exists)

DOCKER_STORAGE_OPTIONS='--storage-driver=overlay --graph=CUSTOM_PATH'

  • Restart docker systemctl stop docker systemctl daemon-reload systemctl start docker

if you run command docker info ( it should show storage driver as overlay)

Remove empty lines in a text file via grep

grep '^..' my_file

example

THIS

IS

THE

FILE

EOF_MYFILE

it gives as output only lines with at least 2 characters.

THIS
IS
THE
FILE
EOF_MYFILE

See also the results with grep '^' my_file outputs

THIS

IS

THE

FILE

EOF_MYFILE

and also with grep '^.' my_file outputs

THIS
IS
THE
FILE
EOF_MYFILE

How can I color dots in a xy scatterplot according to column value?

If you code your x axis text categories, list them in a single column, then in adjacent columns list plot points for respective variables against relevant text category code and just leave blank cells against non-relevant text category code, you can scatter plot and get the displayed result. Any questions let me know. enter image description here

How to fix Error: listen EADDRINUSE while using nodejs?

The error EADDRINUSE (Address already in use) reports that there is already another process on the local system occupying that address / port.

There is a npm package called find-process which helps finding (and closing) the occupying process.

Here is a little demo code:

const find = require('find-process')

const PORT = 80

find('port', PORT)
.then((list) => {
  console.log(`Port "${PORT}" is blocked. Killing blocking applications...`)
  const processIds = list.map((item) => item.pid)
  processIds.forEach((pid) => process.kill(pid, 10))
})

I prepared a small sample which can reproduce the EADDRINUSE error. If you launch the following program in two separate terminals, you will see that the first terminal will start a server (on port "3000") and the second terminal will close the already running server (because it blocks the execution of the second terminal, EADDRINUSE):

Minimal Working Example:

const find = require('find-process')
const http = require('http')

const PORT = 3000

// Handling exceptions
process.on('uncaughtException', (error) => {
  if (error.code === 'EADDRINUSE') {
    find('port', PORT)
      .then((list) => {
        const blockingApplication = list[0]
        if (blockingApplication) {
          console.log(`Port "${PORT}" is blocked by "${blockingApplication.name}".`)
          console.log('Shutting down blocking application...')
          process.kill(blockingApplication.pid)
          // TODO: Restart server
        }
      })
  }
})

// Starting server
const server = http.createServer((request, response) => {
  response.writeHead(200, {'Content-Type': 'text/plain'})
  response.write('Hello World!')
  response.end()
})

server.listen(PORT, () => console.log(`Server running on port "${PORT}"...`))

How to change Elasticsearch max memory size

Instructions for ubuntu 14.04:

sudo vim /etc/init.d/elasticsearch

Set

ES_HEAP_SIZE=512m

then in:

sudo vim /etc/elasticsearch/elasticsearch.yml

Set:

bootstrap.memory_lock: true

There are comments in the files for more info

MySQL CREATE FUNCTION Syntax

MySQL create function syntax:

DELIMITER //

CREATE FUNCTION GETFULLNAME(fname CHAR(250),lname CHAR(250))
    RETURNS CHAR(250)
    BEGIN
        DECLARE fullname CHAR(250);
        SET fullname=CONCAT(fname,' ',lname);
        RETURN fullname;
    END //

DELIMITER ;

Use This Function In Your Query

SELECT a.*,GETFULLNAME(a.fname,a.lname) FROM namedbtbl as a


SELECT GETFULLNAME("Biswarup","Adhikari") as myname;

Watch this Video how to create mysql function and how to use in your query

Create Mysql Function Video Tutorial

Trying to load local JSON file to show data in a html page using JQuery

I would try to save my object as .txt file and then fetch it like this: 

 $.get('yourJsonFileAsString.txt', function(data) {
   console.log( $.parseJSON( data ) );
 });

Share Text on Facebook from Android App via ACTION_SEND

06/2013 :

  • This is a bug from Facebook, not your code
  • Facebook will NOT fix this bug, they say it is "by design" that they broke the Android share system : https://developers.facebook.com/bugs/332619626816423
  • use the SDK or share only URL.
  • Tips: you could cheat a little using the web page title as text for the post.

Do we need type="text/css" for <link> in HTML5

Don’t need to specify a type value of “text/css”

Every time you link to a CSS file:

<link rel="stylesheet" type="text/css" href="file.css">

You can simply write:

<link rel="stylesheet" href="file.css">

Authentication versus Authorization

Adding to @Kerrek's answer;

Authentication is Generalized form (All employees can login in to the machine )

Authorization is Specialized form (But admin only can install/uninstall the application in Machine)

Easiest way to convert a Blob into a byte array

The easiest way is this.

byte[] bytes = rs.getBytes("my_field");

Create listview in fragment android

Instead:

public class PhotosFragment extends Fragment

You can use:

public class PhotosFragment extends ListFragment

It change the methods

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        ArrayList<ListviewContactItem> listContact = GetlistContact();
        setAdapter(new ListviewContactAdapter(getActivity(), listContact));
    }

onActivityCreated is void and you didn't need to return a view like in onCreateView

You can see an example here

Gradle: Execution failed for task ':processDebugManifest'

Maybe you have some duplicated Activities

Like this: 

<activity android:name=".register.RegisterStepsActivity" />

....

<activity android:name=".register.RegisterStepsActivity" />

just comment one of them

how to update the multiple rows at a time using linq to sql?

Do not use the ToList() method as in the accepted answer !

Running SQL profiler, I verified and found that ToList() function gets all the records from the database. It is really bad performance !!

I would have run this query by pure sql command as follows:

string query = "Update YourTable Set ... Where ...";    
context.Database.ExecuteSqlCommandAsync(query, new SqlParameter("@ColumnY", value1), new SqlParameter("@ColumnZ", value2));

This would operate the update in one-shot without selecting even one row.

How to check type of variable in Java?

Actually quite easy to roll your own tester, by abusing Java's method overload ability. Though I'm still curious if there is an official method in the sdk.

Example:

class Typetester {
    void printType(byte x) {
        System.out.println(x + " is an byte");
    }
    void printType(int x) {
        System.out.println(x + " is an int");
    }
    void printType(float x) {
        System.out.println(x + " is an float");
    }
    void printType(double x) {
        System.out.println(x + " is an double");
    }
    void printType(char x) {
        System.out.println(x + " is an char");
    }
}

then:

Typetester t = new Typetester();
t.printType( yourVariable );

How to print multiple lines of text with Python

As far as I know, there are three different ways.

Use \n in your print:

print("first line\nSecond line")

Use sep="\n" in print:

print("first line", "second line", sep="\n")

Use triple quotes and a multiline string:

print("""
Line1
Line2
""")

Creating an instance of class

Lines 1,2,3,4 will call the default constructor. They are different in the essence as 1,2 are dynamically created object and 3,4 are statically created objects.

In Line 7, you create an object inside the argument call. So its an error.

And Lines 5 and 6 are invitation for memory leak.

403 Forbidden You don't have permission to access /folder-name/ on this server

under etc/apache2/apache2.conf, you can find one or more blocks that describe the server directories and permissions

As an example, this is the default configuration

<Directory /var/www/>
   Options Indexes FollowSymLinks
   AllowOverride None
   Require all granted
</Directory>

you can replicate this but change the directory path /var/www/ with the new directory.

Finally, you need to restart the apache server, you can do that from a terminal with the command: sudo service apache2 restart

Truncating Text in PHP?

 
$text="abc1234567890";

// truncate to 4 chars

echo substr(str_pad($text,4),0,4);

This avoids the problem of truncating a 4 char string to 10 chars .. (i.e. source is smaller than the required)

paint() and repaint() in Java

The paint() method supports painting via a Graphics object.

The repaint() method is used to cause paint() to be invoked by the AWT painting thread.

Android Studio - Device is connected but 'offline'

You maybe having an older version of the ADB, Update the tools package and that should bring down the latest ADB.

jQuery vs document.querySelectorAll

I think the true answer is that jQuery was developed long before querySelector/querySelectorAll became available in all major browsers.

Initial release of jQuery was in 2006. In fact, even jQuery was not the first which implemented CSS selectors.

IE was the last browser to implement querySelector/querySelectorAll. Its 8th version was released in 2009.

So now, DOM elements selectors is not the strongest point of jQuery anymore. However, it still has a lot of goodies up its sleeve, like shortcuts to change element's css and html content, animations, events binding, ajax.

JPA Query.getResultList() - use in a generic way

The above query returns the list of Object[]. So if you want to get the u.name and s.something from the list then you need to iterate and cast that values for the corresponding classes.

How to prevent custom views from losing state across screen orientation changes

Easy with kotlin

@Parcelize
class MyState(val superSavedState: Parcelable?, val loading: Boolean) : View.BaseSavedState(superSavedState), Parcelable


class MyView : View {

    var loading: Boolean = false

    override fun onSaveInstanceState(): Parcelable? {
        val superState = super.onSaveInstanceState()
        return MyState(superState, loading)
    }

    override fun onRestoreInstanceState(state: Parcelable?) {
        val myState = state as? MyState
        super.onRestoreInstanceState(myState?.superSaveState ?: state)

        loading = myState?.loading ?: false
        //redraw
    }
}

Loop Through All Subfolders Using VBA

Just a simple folder drill down. 

sub sample()
    Dim FileSystem As Object
    Dim HostFolder As String

    HostFolder = "C:\"

    Set FileSystem = CreateObject("Scripting.FileSystemObject")
    DoFolder FileSystem.GetFolder(HostFolder)
end  sub

Sub DoFolder(Folder)
    Dim SubFolder
    For Each SubFolder In Folder.SubFolders
        DoFolder SubFolder
    Next
    Dim File
    For Each File In Folder.Files
        ' Operate on each file
    Next
End Sub

Git vs Team Foundation Server

The whole Distributed thing of Git is really really great. it gives a few features Shelvesets don't have (in the current product) such as local rollback and commit options (such as Eclipse's localhistory feature). You could alleviate this using developer branches, but lets be honest, many developers don't like branching and merging one bit. I've been asked to turn on the old style "exclusive checkout" feature in TFS a few times too often (and denied it each and every time).

I think many large enterprises are quite scared to allow a dev to just bring the whole history into a local workspace and take it with them (to a new employer for example)... Stealing a snapshot is bad, but taking away a whole history is even more troublesome. (Not that you couldn't get a full history from TFS of you wanted it)...

It's mentioned that it's a great way to backup, which is great for open source again where the original maintainer might stop to care and removes his version, but for a enterprise plan this again falls short for many enterprises as there is no clear assignment of responsibility to keep backups. And it would be hard to figure out which version to use if the main 'project' vanishes somehow. Which would tend to appoint one repository as leading/central.

What I like most about Git is the Push/Pull option, where you can easily contribute code to a project without the need to have commit rights. I guess you could use very limited users and shelvesets in TFS to mimic this, but it isn't as powerful as the Git option. Branching across team projects might work as well, but from an administrative perspective it's not really feasible for many organisations as adding team projects adds a lot of administartive overhead.

I'd also like to add to the things mentioned in the non source control area. Features such as Work Item Tracking, Reporting and Build Automation (including lab management) greatly benefit from a central leading repository. These become a lot harder when you use a pure distributed model, unless you make one of the nodes leading (and thus go back to a less distributed model).

With TFS Basic coming with TFS 11, it might not be far off to expect a distributed TFS which allows you to sync your local TFS basic to a central TFS in the TFS 12+ era. I'll put my vote for that down in the uservoice!

How do I retrieve the number of columns in a Pandas data frame?

Surprised I haven't seen this yet, so without further ado, here is:

df.columns.size

what's the correct way to send a file from REST web service to client?

I don't recommend encoding binary data in base64 and wrapping it in JSON. It will just needlessly increase the size of the response and slow things down.

Simply serve your file data using GET and application/octect-streamusing one of the factory methods of javax.ws.rs.core.Response (part of the JAX-RS API, so you're not locked into Jersey):

@GET
@Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response getFile() {
  File file = ... // Initialize this to the File path you want to serve.
  return Response.ok(file, MediaType.APPLICATION_OCTET_STREAM)
      .header("Content-Disposition", "attachment; filename=\"" + file.getName() + "\"" ) //optional
      .build();
}

If you don't have an actual File object, but an InputStream, Response.ok(entity, mediaType) should be able to handle that as well.

Loading scripts after page load?

http://jsfiddle.net/c725wcn9/2/embedded

You will need to inspect the DOM to check this works. Jquery is needed.

$(document).ready(function(){
   var el = document.createElement('script');
   el.type = 'application/ld+json';
   el.text = JSON.stringify({ "@context": "http://schema.org",  "@type": "Recipe", "name": "My recipe name" });

   document.querySelector('head').appendChild(el);
});

"Could not find a part of the path" error message

 
File.Copy(file_name, destination_dir + file_name.Substring(source_dir.Length), true);

This line has the error because what the code expected is the directory name + file name, not the file name.

This is the correct one

File.Copy(source_dir + file_name, destination_dir + file_name.Substring(source_dir.Length), true);

Swift Open Link in Safari

since iOS 10 you should use:

guard let url = URL(string: linkUrlString) else {
    return
}
    
if #available(iOS 10.0, *) {
    UIApplication.shared.open(url, options: [:], completionHandler: nil)
} else {
    UIApplication.shared.openURL(url)
}

how to query LIST using linq

Since you haven't given any indication to what you want, here is a link to 101 LINQ samples that use all the different LINQ methods: 101 LINQ Samples

Also, you should really really really change your List into a strongly typed list (List<T>), properly define T, and add instances of T to your list. It will really make the queries much easier since you won't have to cast everything all the time.

Invert "if" statement to reduce nesting

There are a lot of insightful answers there already, but still, I would to direct to a slightly different situation: Instead of precondition, that should be put on top of a function indeed, think of a step-by-step initialization, where you have to check for each step to succeed and then continue with the next. In this case, you cannot check everything at the top.

I found my code really unreadable when writing an ASIO host application with Steinberg's ASIOSDK, as I followed the nesting paradigm. It went like eight levels deep, and I cannot see a design flaw there, as mentioned by Andrew Bullock above. Of course, I could have packed some inner code to another function, and then nested the remaining levels there to make it more readable, but this seems rather random to me.

By replacing nesting with guard clauses, I even discovered a misconception of mine regarding a portion of cleanup-code that should have occurred much earlier within the function instead of at the end. With nested branches, I would never have seen that, you could even say they led to my misconception.

So this might be another situation where inverted ifs can contribute to a clearer code.

Convert time span value to format "hh:mm Am/Pm" using C#

You will need to get a DateTime object from your TimeSpan and then you can format it easily.

One possible solution is adding the timespan to any date with zero time value.

var timespan = new TimeSpan(3, 0, 0);
var output = new DateTime().Add(timespan).ToString("hh:mm tt");

The output value will be "03:00 AM" (for english locale).

Is there a limit on how much JSON can hold?

The maximum length of JSON strings. The default is 2097152 characters, which is equivalent to 4 MB of Unicode string data.

Refer below URL

https://docs.microsoft.com/en-us/dotnet/api/system.web.script.serialization.javascriptserializer.maxjsonlength?view=netframework-4.7.2

Key existence check in HashMap

You won't gain anything by checking that the key exists. This is the code of HashMap:

@Override
public boolean containsKey(Object key) {
    Entry<K, V> m = getEntry(key);
    return m != null;
}

@Override
public V get(Object key) {
    Entry<K, V> m = getEntry(key);
    if (m != null) {
        return m.value;
    }
    return null;
}

Just check if the return value for get() is different from null.

This is the HashMap source code.

Resources :

How to change the name of an iOS app?

Target>Build Setting>Product name

Override devise registrations controller

Very simple methods Just go to the terminal and the type following

rails g devise:controllers users //This will create devise controllers in controllers/users folder

Next to use custom views 

rails g devise:views users //This will create devise views in views/users folder

now in your route.rb file

devise_for :users, controllers: {
           :sessions => "users/sessions",
           :registrations => "users/registrations" }

You can add other controllers too. This will make devise to use controllers in users folder and views in users folder.

Now you can customize your views as your desire and add your logic to controllers in controllers/users folder. Enjoy !

moving committed (but not pushed) changes to a new branch after pull

A simpler approach, which I have been using (assuming you want to move 4 commits):

git format-patch HEAD~4

(Look in the directory from which you executed the last command for the 4 .patch files)

git reset HEAD~4 --hard

git checkout -b tmp/my-new-branch

Then:

git apply /path/to/patch.patch

In whatever order you wanted.

Where is the .NET Framework 4.5 directory?

.NET 4.5 is not a side-by-side version, it replaces the assemblies for 4.0. Much like .NET 3.0, 3.5 and 3.5SP1 replaced the assemblies for 2.0. And added some new ones. The CLR version is still 4.0.30319. You only care about the reference assemblies, they are in c:\program files\reference assemblies.

Round up to Second Decimal Place in Python

The round funtion stated does not works for definate integers like :

a=8
round(a,3)
8.0
a=8.00
round(a,3)
8.0
a=8.000000000000000000000000
round(a,3)
8.0

but , works for :

r=400/3.0
r
133.33333333333334
round(r,3)
133.333

Morever the decimals like 2.675 are rounded as 2.67 not 2.68.
Better use the other method provided above.

Fill username and password using selenium in python

 
driver = webdriver.Firefox(...)  # Or Chrome(), or Ie(), or Opera()

username = driver.find_element_by_id("username")
password = driver.find_element_by_id("password")

username.send_keys("YourUsername")
password.send_keys("Pa55worD")

driver.find_element_by_name("submit").click()

Notes to your code:

PDO's query vs execute

Gilean's answer is great, but I just wanted to add that sometimes there are rare exceptions to best practices, and you might want to test your environment both ways to see what will work best.

In one case, I found that query worked faster for my purposes because I was bulk transferring trusted data from an Ubuntu Linux box running PHP7 with the poorly supported Microsoft ODBC driver for MS SQL Server.

I arrived at this question because I had a long running script for an ETL that I was trying to squeeze for speed. It seemed intuitive to me that query could be faster than prepare & execute because it was calling only one function instead of two. The parameter binding operation provides excellent protection, but it might be expensive and possibly avoided if unnecessary.

Given a couple rare conditions:

  1. If you can't reuse a prepared statement because it's not supported by the Microsoft ODBC driver.

  2. If you're not worried about sanitizing input and simple escaping is acceptable. This may be the case because binding certain datatypes isn't supported by the Microsoft ODBC driver.

  3. PDO::lastInsertId is not supported by the Microsoft ODBC driver.

Here's a method I used to test my environment, and hopefully you can replicate it or something better in yours:

To start, I've created a basic table in Microsoft SQL Server

CREATE TABLE performancetest (
    sid INT IDENTITY PRIMARY KEY,
    id INT,
    val VARCHAR(100)
);

And now a basic timed test for performance metrics.

$logs = [];

$test = function (String $type, Int $count = 3000) use ($pdo, &$logs) {
    $start = microtime(true);
    $i = 0;
    while ($i < $count) {
        $sql = "INSERT INTO performancetest (id, val) OUTPUT INSERTED.sid VALUES ($i,'value $i')";
        if ($type === 'query') {
            $smt = $pdo->query($sql);
        } else {
            $smt = $pdo->prepare($sql);
            $smt ->execute();
        }
        $sid = $smt->fetch(PDO::FETCH_ASSOC)['sid'];
        $i++;
    }
    $total = (microtime(true) - $start);
    $logs[$type] []= $total;
    echo "$total $type\n";
};

$trials = 15;
$i = 0;
while ($i < $trials) {
    if (random_int(0,1) === 0) {
        $test('query');
    } else {
        $test('prepare');
    }
    $i++;
}

foreach ($logs as $type => $log) {
    $total = 0;
    foreach ($log as $record) {
        $total += $record;
    }
    $count = count($log);
    echo "($count) $type Average: ".$total/$count.PHP_EOL;
}

I've played with multiple different trial and counts in my specific environment, and consistently get between 20-30% faster results with query than prepare/execute

5.8128969669342 prepare
5.8688418865204 prepare
4.2948560714722 query
4.9533629417419 query
5.9051351547241 prepare
4.332102060318 query
5.9672858715057 prepare
5.0667371749878 query
3.8260300159454 query
4.0791549682617 query
4.3775160312653 query
3.6910600662231 query
5.2708210945129 prepare
6.2671611309052 prepare
7.3791449069977 prepare
(7) prepare Average: 6.0673267160143
(8) query Average: 4.3276024162769

I'm curious to see how this test compares in other environments, like MySQL.

CSS Div width percentage and padding without breaking layout

You can also use the CSS calc() function to subtract the width of your padding from the percentage of your container's width.

An example:

width: calc((100%) - (32px))

Just be sure to make the subtracted width equal to the total padding, not just one half. If you pad both sides of the inner div with 16px, then you should subtract 32px from the final width, assuming that the example below is what you want to achieve.

_x000D_
_x000D_ 
.outer {_x000D_
  width: 200px;_x000D_
  height: 120px;_x000D_
  background-color: black;_x000D_
}_x000D_
_x000D_
.inner {_x000D_
  height: 40px;_x000D_
  top: 30px;_x000D_
  position: relative;_x000D_
  padding: 16px;_x000D_
  background-color: teal;_x000D_
}_x000D_
_x000D_
#inner-1 {_x000D_
  width: 100%;_x000D_
}_x000D_
_x000D_
#inner-2 {_x000D_
  width: calc((100%) - (32px));_x000D_
}
_x000D_ 
<div class="outer" id="outer-1">_x000D_
  <div class="inner" id="inner-1"> width of 100% </div>_x000D_
</div>_x000D_
_x000D_
<br>_x000D_
<br>_x000D_
_x000D_
<div class="outer" id="outer-2">_x000D_
  <div class="inner" id="inner-2"> width of 100% - 16px </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

Android - drawable with rounded corners at the top only

You may need read this https://developer.android.com/guide/topics/resources/drawable-resource.html#Shape

and below there is a Note.

Note Every corner must (initially) be provided a corner radius greater than 1, or else no corners are rounded. If you want specific corners to not be rounded, a work-around is to use android:radius to set a default corner radius greater than 1, but then override each and every corner with the values you really want, providing zero ("0dp") where you don't want rounded corners.

How do malloc() and free() work?

One implementation of malloc/free does the following:

  1. Get a block of memory from the OS through sbrk() (Unix call).
  2. Create a header and a footer around that block of memory with some information such as size, permissions, and where the next and previous block are.
  3. When a call to malloc comes in, a list is referenced which points to blocks of the appropriate size.
  4. This block is then returned and headers and footers are updated accordingly.

AVD Manager - No system image installed for this target

you should android sdk manager install 4.2 api 17 -> ARM EABI v7a System Image

if not installed ARM EABI v7a System Image, you should install all.

How to easily duplicate a Windows Form in Visual Studio?

If you're working in VS 2019, take a few minutes to create an item template -- it's a perfect solution. How to: Create item templates

Not sure if it applies to earlier versions of VS.

Does WGET timeout?

Since in your question you said it's a PHP script, maybe the best solution could be to simply add in your script:

ignore_user_abort(TRUE);

In this way even if wget terminates, the PHP script goes on being processed at least until it does not exceeds max_execution_time limit (ini directive: 30 seconds by default).

As per wget anyay you should not change its timeout, according to the UNIX manual the default wget timeout is 900 seconds (15 minutes), whis is much larger that the 5-6 minutes you need.

Matplotlib 2 Subplots, 1 Colorbar

Just place the colorbar in its own axis and use subplots_adjust to make room for it.

As a quick example:

import numpy as np
import matplotlib.pyplot as plt

fig, axes = plt.subplots(nrows=2, ncols=2)
for ax in axes.flat:
    im = ax.imshow(np.random.random((10,10)), vmin=0, vmax=1)

fig.subplots_adjust(right=0.8)
cbar_ax = fig.add_axes([0.85, 0.15, 0.05, 0.7])
fig.colorbar(im, cax=cbar_ax)

plt.show()

enter image description here

Note that the color range will be set by the last image plotted (that gave rise to im) even if the range of values is set by vmin and vmax. If another plot has, for example, a higher max value, points with higher values than the max of im will show in uniform color.

Regex to match only uppercase "words" with some exceptions

Why do you need to do this in one monster-regex? You can use actual code to implement some of these rules, and doing so would be much easier to modify if those requirements change later.

For example:

if(/^[A-Z0-9\s]*$/)
    # sentence is all uppercase, so just fail out
    return 0;

# Carry on with matching uppercase terms

Abstract Class:-Real Time Example

You should be able to cite at least one from the JDK itself. Look in the java.util.collections package. There are several abstract classes. You should fully understand interface, abstract, and concrete for Map and why Joshua Bloch wrote it that way.

Resolving a Git conflict with binary files

From the git checkout docs

git checkout [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] [--] <paths>...

--ours
--theirs
When checking out paths from the index, check out stage #2 (ours) or #3 (theirs) for unmerged paths.

The index may contain unmerged entries because of a previous failed merge. By default, if you try to check out such an entry from the index, the checkout operation will fail and nothing will be checked out. Using -f will ignore these unmerged entries. The contents from a specific side of the merge can be checked out of the index by using --ours or --theirs. With -m, changes made to the working tree file can be discarded to re-create the original conflicted merge result.

How to display a list inline using Twitter's Bootstrap

While TheBrent's answer is true in general, it does not answer the question of how to do it in the official bootstrap way. The markup for bootstrap is simple:

<ul class="inline">
  <li>1</li>
  <li>2</li>
  <li>3</li>
</ul>

Source

http://jsfiddle.net/MgcDU/4602/

Datanode process not running in Hadoop

Try this

  1. stop-all.sh
  2. vi hdfs-site.xml
  3. change the value given for property dfs.data.dir
  4. format namenode
  5. start-all.sh

How to flush output of print function?

On Python 3, print can take an optional flush argument

print("Hello world!", flush=True)

On Python 2 you'll have to do

import sys
sys.stdout.flush()

after calling print. By default, print prints to sys.stdout (see the documentation for more about file objects).

Command-line svn for Windows?

The subversion client itself is available on Windows. See here for certified binaries from CollabNet.

CollabNet Subversion Command-Line Client v1.6.9 (for Windows)

This installer only includes the command-line client and an auto-update component.

Even though I can't understand it's possible not to love Tortoise! :)

Note:
The above link is for newer products - you can find version 1.11.1 through 1.7.19 at Older Subversion Releases

Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays

Remove this.requests from

ngOnInit(){
  this.requests=this._http.getRequest().subscribe(res=>this.requests=res);
}

to

ngOnInit(){
  this._http.getRequest().subscribe(res=>this.requests=res);
}

this._http.getRequest() returns a subscription, not the response value. The response value is assigned by the callback passed to subscribe(...)

Splitting a C++ std::string using tokens, e.g. ";"

You could use a string stream and read the elements into the vector.

Here are many different examples...

A copy of one of the examples:

std::vector<std::string> split(const std::string& s, char seperator)
{
   std::vector<std::string> output;

    std::string::size_type prev_pos = 0, pos = 0;

    while((pos = s.find(seperator, pos)) != std::string::npos)
    {
        std::string substring( s.substr(prev_pos, pos-prev_pos) );

        output.push_back(substring);

        prev_pos = ++pos;
    }

    output.push_back(s.substr(prev_pos, pos-prev_pos)); // Last word

    return output;
}

/bin/sh: apt-get: not found

If you are looking inside dockerfile while creating image, add this line:

RUN apk add --update yourPackageName

What does "Content-type: application/json; charset=utf-8" really mean?

I exactly agree with @deceze but I want to develop this "I get an error from the service" part of the question,

We getting this kind of errors as http 415

Http 415 Unsupported Media type error

The HTTP 415 Unsupported Media Type client error response code indicates that the server refuses to accept the request because the payload format is in an unsupported format.

The format problem might be due to the request's indicated Content-Type or Content-Encoding, or as a result of inspecting the data directly.

In other words, such is seen in this example.

  • We have to set the correct content type and we have to accept the right content type as seen Add Content-Type: application/json and Accept: application/json. Otherwise, it will assume the default

How do I get the max ID with Linq to Entity?

NisaPrieto 

Users user = bd.Users.Where(u=> u.UserAge > 21).Max(u => u.UserID);

will not work because MAX returns the same type of variable that the field is so in this case is an INT not an User object.

Add two textbox values and display the sum in a third textbox automatically

i didn't find who made elegant answer , that's why let me say : 

Array.from(
   document.querySelectorAll('#txt1,#txt2')
).map(e => parseInt(e.value) || 0) // to avoid NaN
.reduce((a, b) => a+b, 0)

_x000D_
_x000D_ 
window.sum= () => _x000D_
 document.getElementById('result').innerHTML=    _x000D_
   Array.from(_x000D_
     document.querySelectorAll('#txt1,#txt2')_x000D_
   ).map(e=>parseInt(e.value)||0)_x000D_
   .reduce((a,b)=>a+b,0)
_x000D_ 
<input type="text" id="txt1" onkeyup="sum()"/>_x000D_
<input type="text" id="txt2" onkeyup="sum()"  style="margin-right:10px;"/><span id="result"></span>
_x000D_
_x000D_
_x000D_

How to convert Map keys to array?

I need something similiar with angular reactive form:

let myMap = new Map().set(0, {status: 'VALID'}).set(1, {status: 'INVALID'});
let mapToArray = Array.from(myMap.values());
let isValid = mapToArray.every(x => x.status === 'VALID');

Changing the text on a label

I made a small tkinter application which is sets the label after button clicked

#!/usr/bin/env python
from Tkinter import *
from tkFileDialog import askopenfilename
from tkFileDialog import askdirectory


class Application:
    def __init__(self, master):
        frame = Frame(master,width=200,height=200)
        frame.pack()

        self.log_file_btn = Button(frame, text="Select Log File", command=self.selectLogFile,width=25).grid(row=0)
        self.image_folder_btn = Button(frame, text="Select Image Folder", command=self.selectImageFile,width=25).grid(row=1)
        self.quite_button = Button(frame, text="QUIT", fg="red", command=frame.quit,width=25).grid(row=5)

        self.logFilePath =StringVar()
        self.imageFilePath = StringVar()
        self.labelFolder = Label(frame,textvariable=self.logFilePath).grid(row=0,column=1)
        self.labelImageFile = Label(frame,textvariable = self.imageFilePath).grid(row = 1,column=1)

        def selectLogFile(self):
            filename = askopenfilename()
            self.logFilePath.set(filename)

        def selectImageFile(self):
            imageFolder = askdirectory()
            self.imageFilePath.set(imageFolder)

root = Tk()
root.title("Geo Tagging")
root.geometry("600x100")
app = Application(root)
root.mainloop()

How can I wait for 10 second without locking application UI in android

You can use this:

Handler handler = new Handler();
handler.postDelayed(new Runnable() {
    public void run() {
     // Actions to do after 10 seconds
    }
}, 10000);

For Stop the Handler, You can try this: handler.removeCallbacksAndMessages(null);

Add or change a value of JSON key with jquery or javascript

Once you have decoded the JSON, the result is a JavaScript object. Just manipulate it as you would any other object. For example:

data.busNum = 12345;
...

What causes and what are the differences between NoClassDefFoundError and ClassNotFoundException?

I remind myself the following again and again when I need to refresh

ClassNotFoundException

Class Hierarchy

ClassNotFoundException extends ReflectiveOperationException extends Exception extends Throwable

While debugging

  1. Required jar, class is missing from the classpath.
  2. Verify all the required jars are in classpath of jvm.

NoClassDefFoundError

Class Hierarchy

NoClassDefFoundError extends LinkageError  extends Error extends Throwable

While debugging

  1. Problem with loading a class dynamically, which was compiled properly
  2. Problem with static blocks, constructors, init() methods of dependent class and the actual error is wrapped by multiple layers [especially when you use spring, hibernate the actual exception is wrapped and you will get NoClassDefError]
  3. When you face "ClassNotFoundException" under a static block of dependent class
  4. Problem with versions of class. This happens when you have two versions v1, v2 of same class under different jar/packages, which was compiled successfully using v1 and v2 is loaded at the runtime which doesn't has the relevant methods/vars& you will see this exception. [I once resolved this issue by removing the duplicate of log4j related class under multiple jars that appeared in the classpath]

a page can have only one server-side form tag

I think you did like this:

<asp:Content ID="Content2" ContentPlaceHolderID="MasterContent" runat="server">
  <form id="form1" runat="server">

 </form>
</asp:Content>

The form tag isn't needed. because you already have the same tag in the master page.

So you just remove that and it should be working.

What is the use of GO in SQL Server Management Studio & Transact SQL?

Just to add to the existing answers, when you are creating views you must separate these commands into batches using go, otherwise you will get the error 'CREATE VIEW' must be the only statement in the batch. So, for example, you won't be able to execute the following sql script without go

create view MyView1 as
select Id,Name from table1
go
create view MyView2 as
select Id,Name from table1
go

select * from MyView1
select * from MyView2

Copy a file list as text from Windows Explorer

If you paste the listing into your word processor instead of Notepad, (since each file name is in quotation marks with the full path name), you can highlight all the stuff you don't want on the first file, then use Find and Replace to replace every occurrence of that with nothing. Same with the ending quote (").

It makes a nice clean list of file names.

Convert a string to int using sql query

Try this one, it worked for me in Athena:

cast(MyVarcharCol as integer)

Format Date as "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"

Call the toISOString() method:

var dt = new Date("30 July 2010 15:05 UTC");
document.write(dt.toISOString());

// Output:
//  2010-07-30T15:05:00.000Z

How to find if div with specific id exists in jQuery?

 
if($("#id").length) /*exists*/

if(!$("#id").length) /*doesn't exist*/

Pick images of root folder from sub-folder

../images/logo.png will move you back one folder.

../../images/logo.png will move you back two folders.

/images/logo.png will take you back to the root folder no matter where you are/.

How to determine if a number is positive or negative?

Well, taking advantage of casting (since we don't care what the actual value is) perhaps the following would work. Bear in mind that the actual implementations do not violate the API rules. I've edited this to make the method names a bit more obvious and in light of @chris' comment about the {-1,+1} problem domain. Essentially, this problem does not appear to solvable without recourse to API methods within Float or Double that reference the native bit structure of the float and double primitives.

As everybody else has said: Stupid interview question. Grr.

public class SignDemo {

  public static boolean isNegative(byte x) {
    return (( x >> 7 ) & 1) == 1;
  }

  public static boolean isNegative(short x) {
    return (( x >> 15 ) & 1) == 1;
  }

  public static boolean isNegative(int x) {
    return (( x >> 31 ) & 1) == 1;
  }

  public static boolean isNegative(long x) {
    return (( x >> 63 ) & 1) == 1;
  }

  public static boolean isNegative(float x) {
    return isNegative((int)x);
  }

  public static boolean isNegative(double x) {
    return isNegative((long)x);
  }

  public static void main(String[] args) {


    // byte
    System.out.printf("Byte %b%n",isNegative((byte)1));
    System.out.printf("Byte %b%n",isNegative((byte)-1));

    // short
    System.out.printf("Short %b%n",isNegative((short)1));
    System.out.printf("Short %b%n",isNegative((short)-1));

    // int
    System.out.printf("Int %b%n",isNegative(1));
    System.out.printf("Int %b%n",isNegative(-1));

    // long
    System.out.printf("Long %b%n",isNegative(1L));
    System.out.printf("Long %b%n",isNegative(-1L));

    // float
    System.out.printf("Float %b%n",isNegative(Float.MAX_VALUE));
    System.out.printf("Float %b%n",isNegative(Float.NEGATIVE_INFINITY));

    // double
    System.out.printf("Double %b%n",isNegative(Double.MAX_VALUE));
    System.out.printf("Double %b%n",isNegative(Double.NEGATIVE_INFINITY));

    // interesting cases
    // This will fail because we can't get to the float bits without an API and
    // casting will round to zero
    System.out.printf("{-1,1} (fail) %b%n",isNegative(-0.5f));

  }

}

Wi-Fi Direct and iOS Support

It took me a while to find out what is going on, but here is the summary. I hope this save people a lot of time.

Apple are not playing nice with Wi-Fi Direct, not in the same way that Android is. The Multipeer Connectivity Framework that Apple provides combines both BLE and WiFi Direct together and will only work with Apple devices and not any device that is using Wi-Fi Direct.

https://developer.apple.com/library/ios/documentation/MultipeerConnectivity/Reference/MultipeerConnectivityFramework/index.html

It states the following in this documentation - "The Multipeer Connectivity framework provides support for discovering services provided by nearby iOS devices using infrastructure Wi-Fi networks, peer-to-peer Wi-Fi, and Bluetooth personal area networks and subsequently communicating with those services by sending message-based data, streaming data, and resources (such as files)."

Additionally, Wi-Fi direct in this mode between i-Devices will need iPhone 5 and above.

There are apps that use a form of Wi-Fi Direct on the App Store, but these are using their own libraries.

Resolve Javascript Promise outside function scope

Bit late to the party here, but another way to do it would be to use a Deferred object. You essentially have the same amount of boilerplate, but it's handy if you want to pass them around and possibly resolve outside of their definition.

Naive Implementation:

class Deferred {
  constructor() {
    this.promise = new Promise((resolve, reject)=> {
      this.reject = reject
      this.resolve = resolve
    })
  }
}

function asyncAction() {
  var dfd = new Deferred()

  setTimeout(()=> {
    dfd.resolve(42)
  }, 500)

  return dfd.promise
}

asyncAction().then(result => {
  console.log(result) // 42
})

ES5 Version:

function Deferred() {
  var self = this;
  this.promise = new Promise(function(resolve, reject) {
    self.reject = reject
    self.resolve = resolve
  })
}

function asyncAction() {
  var dfd = new Deferred()

  setTimeout(function() {
    dfd.resolve(42)
  }, 500)

  return dfd.promise
}

asyncAction().then(function(result) {
  console.log(result) // 42
})

How to animate the change of image in an UIImageView?

In the words of Michael Scott, keep it simple stupid. Here is a simple way to do this in Swift 3 and Swift 4: 

UIView.transition(with: imageView,
                  duration: 0.75,
                  options: .transitionCrossDissolve,
                  animations: { self.imageView.image = toImage },
                  completion: nil)

Alter column in SQL Server

To set a default value to a column, try this:

ALTER TABLE tb_TableName
ALTER COLUMN Record_Status SET DEFAULT 'default value'

Insert Unicode character into JavaScript

Although @ruakh gave a good answer, I will add some alternatives for completeness:

You could in fact use even var Omega = '&#937;' in JavaScript, but only if your JavaScript code is:

  • inside an event attribute, as in onclick="var Omega = '&#937'; alert(Omega)" or
  • in a script element inside an XHTML (or XHTML + XML) document served with an XML content type.

In these cases, the code will be first (before getting passed to the JavaScript interpreter) be parsed by an HTML parser so that character references like &#937; are recognized. The restrictions make this an impractical approach in most cases.

You can also enter the O character as such, as in var Omega = 'O', but then the character encoding must allow that, the encoding must be properly declared, and you need software that let you enter such characters. This is a clean solution and quite feasible if you use UTF-8 encoding for everything and are prepared to deal with the issues created by it. Source code will be readable, and reading it, you immediately see the character itself, instead of code notations. On the other hand, it may cause surprises if other people start working with your code.

Using the \u notation, as in var Omega = '\u03A9', works independently of character encoding, and it is in practice almost universal. It can however be as such used only up to U+FFFF, i.e. up to \uffff, but most characters that most people ever heard of fall into that area. (If you need “higher” characters, you need to use either surrogate pairs or one of the two approaches above.)

You can also construct a character using the String.fromCharCode() method, passing as a parameter the Unicode number, in decimal as in var Omega = String.fromCharCode(937) or in hexadecimal as in var Omega = String.fromCharCode(0x3A9). This works up to U+FFFF. This approach can be used even when you have the Unicode number in a variable.

Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused

is very simple, only delete a file /var/lib/mongodb/mongodb.lock. after only execute: mongo. finished

Rounding Bigdecimal values with 2 Decimal Places

You may try this:

public static void main(String[] args) {
    BigDecimal a = new BigDecimal("10.12345");
    System.out.println(toPrecision(a, 2));
}

private static BigDecimal toPrecision(BigDecimal dec, int precision) {
    String plain = dec.movePointRight(precision).toPlainString();
    return new BigDecimal(plain.substring(0, plain.indexOf("."))).movePointLeft(precision);
}

OUTPUT:

10.12

How to check if a Ruby object is a Boolean

I find this to be concise and self-documenting:

[true, false].include? foo

If using Rails or ActiveSupport, you can even do a direct query using in?

foo.in? [true, false]

Checking against all possible values isn't something I'd recommend for floats, but feasible when there are only two possible values!

DateTime format to SQL format using C#

Your problem is in the "Date" property that truncates DateTime to date only. You could put the conversion like this:

DateTime myDateTime = DateTime.Now;
string sqlFormattedDate = myDateTime.ToString("yyyy-MM-dd HH:mm:ss"); // <- No Date.ToString()!

Using Regular Expressions to Extract a Value in Java

In Java 1.4 and up:

String input = "...";
Matcher matcher = Pattern.compile("[^0-9]+([0-9]+)[^0-9]+").matcher(input);
if (matcher.find()) {
    String someNumberStr = matcher.group(1);
    // if you need this to be an int:
    int someNumberInt = Integer.parseInt(someNumberStr);
}

Error: Selection does not contain a main type

When you save your file, make sure it has the extension .java. If it does not, Eclipse won't know to read it as a java file.

List all kafka topics

Kafka is a distributed system and needs Zookeeper. you have to start zookeeper too. Follow "Quick Start" here : https://kafka.apache.org/0100/documentation.html#quickstart

Understanding typedefs for function pointers in C

 
int add(int a, int b)
{
  return (a+b);
}
int minus(int a, int b)
{
  return (a-b);
}

typedef int (*math_func)(int, int); //declaration of function pointer

int main()
{
  math_func addition = add;  //typedef assigns a new variable i.e. "addition" to original function "add"
  math_func substract = minus; //typedef assigns a new variable i.e. "substract" to original function "minus"

  int c = addition(11, 11);   //calling function via new variable
  printf("%d\n",c);
  c = substract(11, 5);   //calling function via new variable
  printf("%d",c);
  return 0;
}

Output of this is :

22

6

Note that, same math_func definer has been used for the declaring both the function.

Same approach of typedef may be used for extern struct.(using sturuct in other file.)

Align labels in form next to input

You can also try using flex-box

<head><style>
body {
    color:white;
    font-family:arial;
    font-size:1.2em;
}
form {
    margin:0 auto;
    padding:20px;
    background:#444;
}
.input-group {
    margin-top:10px;
    width:60%;
    display:flex;
    justify-content:space-between;
    flex-wrap:wrap;
}
label, input {
    flex-basis:100px;
}
</style></head>
<body>

<form>
    <div class="wrapper">
        <div class="input-group">
            <label for="user_name">name:</label>
            <input type="text" id="user_name">
        </div>
        <div class="input-group">
            <label for="user_pass">Password:</label>
            <input type="password" id="user_pass">
        </div>
    </div>
</form>

</body>
</html>

How to Select Min and Max date values in Linq Query

 
dim mydate = from cv in mydata.t1s
  select cv.date1 asc

datetime mindata = mydate[0];

How can I undo a mysql statement that I just executed?

If you define table type as InnoDB, you can use transactions. You will need set AUTOCOMMIT=0, and after you can issue COMMIT or ROLLBACK at the end of query or session to submit or cancel a transaction. 

ROLLBACK -- will undo the changes that you have made

How to solve "The specified service has been marked for deletion" error

In my case it worked after closing the Services. Check if the Services.msc is open, if yes close it and check any process of service is found in Task Manager.

Get current URL from IFRAME

If your iframe is from another domain, (cross domain), the other answers are not going to help you... you will simply need to use this:

var currentUrl = document.referrer;

and - here you've got the main url!

Android Service needs to run always (Never pause or stop)

You can implement startForeground for the service and even if it dies you can restart it by using START_STICKY on startCommand(). Not sure though this is the right implementation.

How to get file path in iPhone app

If your tiles are not in your bundle, either copied from the bundle or downloaded from the internet you can get the directory like this

NSString *documentdir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *tileDirectory = [documentdir stringByAppendingPathComponent:@"xxxx/Tiles"];
NSLog(@"Tile Directory: %@", tileDirectory);

how to use a like with a join in sql?

In MySQL you could try:

SELECT * FROM A INNER JOIN B ON B.MYCOL LIKE CONCAT('%', A.MYCOL, '%');

Of course this would be a massively inefficient query because it would do a full table scan.

Update: Here's a proof


create table A (MYCOL varchar(255));
create table B (MYCOL varchar(255));
insert into A (MYCOL) values ('foo'), ('bar'), ('baz');
insert into B (MYCOL) values ('fooblah'), ('somethingfooblah'), ('foo');
insert into B (MYCOL) values ('barblah'), ('somethingbarblah'), ('bar');
SELECT * FROM A INNER JOIN B ON B.MYCOL LIKE CONCAT('%', A.MYCOL, '%');
+-------+------------------+
| MYCOL | MYCOL            |
+-------+------------------+
| foo   | fooblah          |
| foo   | somethingfooblah |
| foo   | foo              |
| bar   | barblah          |
| bar   | somethingbarblah |
| bar   | bar              |
+-------+------------------+
6 rows in set (0.38 sec)

Make a directory and copy a file

Use the FileSystemObject object, namely, its CreateFolder and CopyFile methods. Basically, this is what your script will look like:

Dim oFSO
Set oFSO = CreateObject("Scripting.FileSystemObject")

' Create a new folder
oFSO.CreateFolder "C:\MyFolder"

' Copy a file into the new folder
' Note that the destination folder path must end with a path separator (\)
oFSO.CopyFile "\\server\folder\file.ext", "C:\MyFolder\"

You may also want to add additional logic, like checking whether the folder you want to create already exists (because CreateFolder raises an error in this case) or specifying whether or not to overwrite the file being copied. So, you can end up with this:

Const strFolder = "C:\MyFolder\", strFile = "\\server\folder\file.ext"
Const Overwrite = True
Dim oFSO

Set oFSO = CreateObject("Scripting.FileSystemObject")

If Not oFSO.FolderExists(strFolder) Then
  oFSO.CreateFolder strFolder
End If

oFSO.CopyFile strFile, strFolder, Overwrite

Given an array of numbers, return array of products of all other numbers (no division)

Here is the ptyhon version

  # This solution use O(n) time and O(n) space
  def productExceptSelf(self, nums):
    """
    :type nums: List[int]
    :rtype: List[int]
    """
    N = len(nums)
    if N == 0: return

    # Initialzie list of 1, size N
    l_prods, r_prods = [1]*N, [1]*N

    for i in range(1, N):
      l_prods[i] = l_prods[i-1] * nums[i-1]

    for i in reversed(range(N-1)):
      r_prods[i] = r_prods[i+1] * nums[i+1]

    result = [x*y for x,y in zip(l_prods,r_prods)]
    return result

  # This solution use O(n) time and O(1) space
  def productExceptSelfSpaceOptimized(self, nums):
    """
    :type nums: List[int]
    :rtype: List[int]
    """
    N = len(nums)
    if N == 0: return

    # Initialzie list of 1, size N
    result = [1]*N

    for i in range(1, N):
      result[i] = result[i-1] * nums[i-1]

    r_prod = 1
    for i in reversed(range(N)):
      result[i] *= r_prod
      r_prod *= nums[i]

    return result

How to connect PHP with Microsoft Access database

If you are struggling with the connection in the XAMPP environment I suggest uncommenting the following entry in the php.ini file.

extension = odbc

I received an error without it: Uncaught pdoexception: could not find driver

Today`s date in an excel macro

Here's an example that puts the Now() value in column A. 

Sub move()
    Dim i As Integer
    Dim sh1 As Worksheet
    Dim sh2 As Worksheet
    Dim nextRow As Long
    Dim copyRange As Range
    Dim destRange As Range

    Application.ScreenUpdating = False

        Set sh1 = ActiveWorkbook.Worksheets("Sheet1")
        Set sh2 = ActiveWorkbook.Worksheets("Sheet2")
        Set copyRange = sh1.Range("A1:A5")

        i = Application.WorksheetFunction.CountA(sh2.Range("B:B")) + 4

        Set destRange = sh2.Range("B" & i)

        destRange.Resize(1, copyRange.Rows.Count).Value = Application.Transpose(copyRange.Value)
        destRange.Offset(0, -1).Value = Format(Now(), "MMM-DD-YYYY")

        copyRange.Clear

    Application.ScreenUpdating = True

End Sub

There are better ways of getting the last row in column B than using a While loop, plenty of examples around here. Some are better than others but depend on what you're doing and what your worksheet structure looks like. I used one here which assumes that column B is ALL empty except the rows/records you're moving. If that's not the case, or if B1:B3 have some values in them, you'd need to modify or use another method. Or you could just use your loop, but I'd search for alternatives :)

align textbox and text/labels in html?

you can do a multi div layout like this

<div class="fieldcontainer">
    <div class="label"></div>
    <div class="field"></div>
</div>

where .fieldcontainer { clear: both; } .label { float: left; width: ___ } .field { float: left; }

Or, I actually prefer tables for forms like this. This is very much tabular data and it comes out very clean. Both will work though.

How to write/update data into cells of existing XLSX workbook using xlsxwriter in python

If you have issue with writing into an existing xls file because it is already created you need to put checking part like below:

PATH='filename.xlsx'
if os.path.isfile(PATH):
    print "File exists and will be overwrite NOW"
else:
    print "The file is missing, new one is created"

... and here part with the data you want to add

How can I create an array with key value pairs?

You can create the single value array key-value as 

$new_row = array($row["datasource_id"]=>$row["title"]);

inside while loop, and then use array_merge function in loop to combine the each new $new_row array.

GitHub - failed to connect to github 443 windows/ Failed to connect to gitHub - No Error

On Windows 7 setting the proxy to global config will resolve this issue

git config --global http.proxy http://user:password@proxy_addr:port

but the problem here is your password will not be encrypted.. Hopefully that should not be much problem as most of time you will be sole owner of your PC.

Pushing value of Var into an Array

Off the top of my head I think it should be done like this:

var veggies = "carrot";
var fruitvegbasket = [];
fruitvegbasket.push(veggies);

calculating the difference in months between two dates

If you're dealing with months and years you need something that knows how many days each month has and which years are leap years.

Enter the Gregorian Calendar (and other culture-specific Calendar implementations).

While Calendar doesn't provide methods to directly calculate the difference between two points in time, it does have methods such as 

DateTime AddWeeks(DateTime time, int weeks)
DateTime AddMonths(DateTime time, int months)
DateTime AddYears(DateTime time, int years)

What are all the possible values for HTTP "Content-Type" header?

If you are using jaxrs or any other, then there will be a class called mediatype.User interceptor before sending the request and compare it against this.

Spring - No EntityManager with actual transaction available for current thread - cannot reliably process 'persist' call

I had the same error because I switched from XML- to java-configuration.

The point was, I didn't migrate <tx:annotation-driven/> tag, as Stone Feng suggested.

So I just added @EnableTransactionManagement as suggested here Setting Up Annotation Driven Transactions in Spring in @Configuration Class, and it works now

Saving any file to in the database, just convert it to a byte array?

Confirming I was able to use the answer posted by MadBoy and edited by Otiel on both MS SQL Server 2012 and 2014 in addition to the versions previously listed using varbinary(MAX) columns.

If you are wondering why you cannot "Filestream" (noted in a separate answer) as a datatype in the SQL Server table designer or why you cannot set a column's datatype to "Filestream" using T-SQL, it is because FILESTREAM is a storage attribute of the varbinary(MAX) datatype. It is not a datatype on its own.

See these articles on setting up and enabling FILESTREAM on a database: https://msdn.microsoft.com/en-us/library/cc645923(v=sql.120).aspx

http://www.kodyaz.com/t-sql/default-filestream-filegroup-is-not-available-in-database.aspx

Once configured, a filestream enabled varbinary(max) column can be added as so:

ALTER TABLE TableName

ADD ColumnName varbinary(max) FILESTREAM NULL

GO

Python in Xcode 4+?

You should try PyDev plug in for Eclipse. I tried alot of editors/IDE's to use with python, but the only one i liked the most is the PyDev plugin for Eclipse. It has code completion, debugger and many other nice features. Plus both are free.

Calculating frames per second in a game

Increment a counter every time you render a screen and clear that counter for some time interval over which you want to measure the frame-rate.

Ie. Every 3 seconds, get counter/3 and then clear the counter.

Matching a Forward Slash with a regex

You can escape it like this.

/\//ig; //  Matches /

or just use indexOf

if(str.indexOf("/") > -1)

How do you convert Html to plain text?

I had the same question, just my html had a simple pre-known layout, like:

<DIV><P>abc</P><P>def</P></DIV>

So I ended up using such simple code:

string.Join (Environment.NewLine, XDocument.Parse (html).Root.Elements ().Select (el => el.Value))

Which outputs:

abc
def

When should I use the Visitor Design Pattern?

One way to look at it is that the visitor pattern is a way of letting your clients add additional methods to all of your classes in a particular class hierarchy.

It is useful when you have a fairly stable class hierarchy, but you have changing requirements of what needs to be done with that hierarchy.

The classic example is for compilers and the like. An Abstract Syntax Tree (AST) can accurately define the structure of the programming language, but the operations you might want to do on the AST will change as your project advances: code-generators, pretty-printers, debuggers, complexity metrics analysis.

Without the Visitor Pattern, every time a developer wanted to add a new feature, they would need to add that method to every feature in the base class. This is particularly hard when the base classes appear in a separate library, or are produced by a separate team.

(I have heard it argued that the Visitor pattern is in conflict with good OO practices, because it moves the operations of the data away from the data. The Visitor pattern is useful in precisely the situation that the normal OO practices fail.)

laravel select where and where condition

The error is coming from $userRecord->email. You need to use the ->get() or ->first() methods when calling from the database otherwise you're only getting the Eloquent\Builder object rather than an Eloquent\Collection

The ->first() method is pretty self-explanatory, it will return the first row found. ->get() returns all the rows found

$userRecord = Model::where('email', '=', $email)->where('password', '=', $password)->get();
echo "First name: " . $userRecord->email;

how to set the background color of the whole page in css

I already wrote up the answer to this but it seems to have been deleted. The issue was that YUI added background-color:white to the HTML element. I overwrote that and everything was easy to handle from there.

Bootstrap: How do I identify the Bootstrap version?

To check what version you currently have, you can use -v for the command line/console terminal.

bootstrap -v

https://www.npmjs.com/package/bootstrap-cli

Python: print a generator expression?

Quick answer:

Doing list() around a generator expression is (almost) exactly equivalent to having [] brackets around it. So yeah, you can do

>>> list((x for x in string.letters if x in (y for y in "BigMan on campus")))

But you can just as well do

>>> [x for x in string.letters if x in (y for y in "BigMan on campus")]

Yes, that will turn the generator expression into a list comprehension. It's the same thing and calling list() on it. So the way to make a generator expression into a list is to put brackets around it.

Detailed explanation:

A generator expression is a "naked" for expression. Like so:

x*x for x in range(10)

Now, you can't stick that on a line by itself, you'll get a syntax error. But you can put parenthesis around it.

>>> (x*x for x in range(10))
<generator object <genexpr> at 0xb7485464>

This is sometimes called a generator comprehension, although I think the official name still is generator expression, there isn't really any difference, the parenthesis are only there to make the syntax valid. You do not need them if you are passing it in as the only parameter to a function for example:

>>> sorted(x*x for x in range(10))
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

Basically all the other comprehensions available in Python 3 and Python 2.7 is just syntactic sugar around a generator expression. Set comprehensions:

>>> {x*x for x in range(10)}
{0, 1, 4, 81, 64, 9, 16, 49, 25, 36}

>>> set(x*x for x in range(10))
{0, 1, 4, 81, 64, 9, 16, 49, 25, 36}

Dict comprehensions:

>>> dict((x, x*x) for x in range(10))
{0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81}

>>> {x: x*x for x in range(10)}
{0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81}

And list comprehensions under Python 3:

>>> list(x*x for x in range(10))
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

>>> [x*x for x in range(10)]
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

Under Python 2, list comprehensions is not just syntactic sugar. But the only difference is that x will under Python 2 leak into the namespace.

>>> x
9

While under Python 3 you'll get 

>>> x
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'x' is not defined

This means that the best way to get a nice printout of the content of your generator expression in Python is to make a list comprehension out of it! However, this will obviously not work if you already have a generator object. Doing that will just make a list of one generator:

>>> foo = (x*x for x in range(10))
>>> [foo]
[<generator object <genexpr> at 0xb7559504>]

In that case you will need to call list():

>>> list(foo)
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

Although this works, but is kinda stupid:

>>> [x for x in foo]
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

How to create an Excel File with Nodejs?

You should check ExcelJS

Works with CSV and XLSX formats.

Great for reading/writing XLSX streams. I've used it to stream an XLSX download to an Express response object, basically like this:

app.get('/some/route', function(req, res) {
  res.writeHead(200, {
    'Content-Disposition': 'attachment; filename="file.xlsx"',
    'Transfer-Encoding': 'chunked',
    'Content-Type': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
  })
  var workbook = new Excel.stream.xlsx.WorkbookWriter({ stream: res })
  var worksheet = workbook.addWorksheet('some-worksheet')
  worksheet.addRow(['foo', 'bar']).commit()
  worksheet.commit()
  workbook.commit()
}

Works great for large files, performs much better than excel4node (got huge memory usage & Node process "out of memory" crash after nearly 5 minutes for a file containing 4 million cells in 20 sheets) since its streaming capabilities are much more limited (does not allows to "commit()" data to retrieve chunks as soon as they can be generated)

See also this SO answer.

Multiple cases in switch statement

There is no syntax in C++ nor C# for the second method you mentioned.

There's nothing wrong with your first method. If however you have very big ranges, just use a series of if statements.

Markdown `native` text alignment

To center align, surround the text you wish to center align with arrows (-> <-) like so: 

-> This is center aligned <-

MVC Razor Radio Button

I wanted to share one way to do the radio button (and entire HTML form) without using the @Html.RadioButtonFor helper, although I think @Html.RadioButtonFor is probably the better and newer way (for one thing, it's strongly typed, so is closely linked to theModelProperty). Nevertheless, here's an old-fashioned, different way you can do it:

    <form asp-action="myActionMethod" method="post">
        <h3>Do you like pizza?</h3>
        <div class="checkbox">
            <label>
                <input asp-for="likesPizza"/> Yes
            </label>
        </div>
    </form>

This code can go in a myView.cshtml file, and also uses classes to get the radio-button (checkbox) formatting.

How to add two strings as if they were numbers?

MDN docs for parseInt
MDN docs for parseFloat

In parseInt radix is specified as ten so that we are in base 10. In nonstrict javascript a number prepended with 0 is treated as octal. This would obviously cause problems!

parseInt(num1, 10) + parseInt(num2, 10) //base10
parseFloat(num1) + parseFloat(num2)

Also see ChaosPandion's answer for a useful shortcut using a unary operator. I have set up a fiddle to show the different behaviors.

http://jsfiddle.net/EtX6G/

var ten = '10';
var zero_ten = '010';
var one = '1';
var body = document.getElementsByTagName('body')[0];

Append(parseInt(ten) + parseInt(one));
Append(parseInt(zero_ten) + parseInt(one));
Append(+ten + +one);
Append(+zero_ten + +one);

function Append(text) {
    body.appendChild(document.createTextNode(text));
    body.appendChild(document.createElement('br'));
}

How to use a global array in C#?

Your class shoud look something like this:

class Something {     int[] array; //global array, replace type of course     void function1() {        array = new int[10]; //let say you declare it here that will be 10 integers in size     }     void function2() {        array[0] = 12; //assing value at index 0 to 12.     } }

That way you array will be accessible in both functions. However, you must be careful with global stuff, as you can quickly overwrite something.

ORA-30926: unable to get a stable set of rows in the source tables

How to Troubleshoot ORA-30926 Errors? (Doc ID 471956.1)

1) Identify the failing statement

alter session set events ‘30926 trace name errorstack level 3’;

or

alter system set events ‘30926 trace name errorstack off’;

and watch for .trc files in UDUMP when it occurs.

2) Having found the SQL statement, check if it is correct (perhaps using explain plan or tkprof to check the query execution plan) and analyze or compute statistics on the tables concerned if this has not recently been done. Rebuilding (or dropping/recreating) indexes may help too.

3.1) Is the SQL statement a MERGE? evaluate the data returned by the USING clause to ensure that there are no duplicate values in the join. Modify the merge statement to include a deterministic where clause

3.2) Is this an UPDATE statement via a view? If so, try populating the view result into a table and try updating the table directly.

3.3) Is there a trigger on the table? Try disabling it to see if it still fails.

3.4) Does the statement contain a non-mergeable view in an 'IN-Subquery'? This can result in duplicate rows being returned if the query has a "FOR UPDATE" clause. See Bug 2681037

3.5) Does the table have unused columns? Dropping these may prevent the error.

4) If modifying the SQL does not cure the error, the issue may be with the table, especially if there are chained rows. 4.1) Run the ‘ANALYZE TABLE VALIDATE STRUCTURE CASCADE’ statement on all tables used in the SQL to see if there are any corruptions in the table or its indexes. 4.2) Check for, and eliminate, any CHAINED or migrated ROWS on the table. There are ways to minimize this, such as the correct setting of PCTFREE. Use Note 122020.1 - Row Chaining and Migration 4.3) If the table is additionally Index Organized, see: Note 102932.1 - Monitoring Chained Rows on IOTs

How to convert strings into integers in Python?

Try this.

x = "1"

x is a string because it has quotes around it, but it has a number in it.

x = int(x)

Since x has the number 1 in it, I can turn it in to a integer.

To see if a string is a number, you can do this.

def is_number(var):
    try:
        if var == int(var):
            return True
    except Exception:
        return False

x = "1"

y = "test"

x_test = is_number(x)

print(x_test)

It should print to IDLE True because x is a number.

y_test = is_number(y)

print(y_test)

It should print to IDLE False because y in not a number.

Change text from "Submit" on input tag

The value attribute is used to determine the rendered label of a submit input.

<input type="submit" class="like" value="Like" />

Note that if the control is successful (this one won't be as it has no name) this will also be the submitted value for it.

To have a different submitted value and label you need to use a button element, in which the textNode inside the element determines the label. You can include other elements (including <img> here).

<button type="submit" class="like" name="foo" value="bar">Like</button>

Note that support for <button> is dodgy in older versions of Internet Explorer.

Table overflowing outside of div

 
overflow-x: auto;
overflow-y : hidden;

Apply the styling above to the parent div.

ERROR 1452: Cannot add or update a child row: a foreign key constraint fails

The Problem is with FOREIGN KEY Constraint. By Default (SET FOREIGN_KEY_CHECKS = 1). FOREIGN_KEY_CHECKS option specifies whether or not to check foreign key constraints for InnoDB tables. MySQL - SET FOREIGN_KEY_CHECKS

We can set foreign key check as disable before running Query. Disable Foreign key.

Execute one of these lines before running your query, then you can run your query successfully. :)

1) For Session (recommended)

SET FOREIGN_KEY_CHECKS=0;

2) Globally

SET GLOBAL FOREIGN_KEY_CHECKS=0;

How to break out of jQuery each Loop

I know its quite an old question but I didn't see any answer, which clarify that why and when its possible to break with return.

I would like to explain it with 2 simple examples:

1. Example: In this case, we have a simple iteration and we want to break with return true, if we can find the three.

function canFindThree() {
    for(var i = 0; i < 5; i++) {
        if(i === 3) {
           return true;
        }
    }
}

if we call this function, it will simply return the true.

2. Example In this case, we want to iterate with jquery's each function, which takes anonymous function as parameter.

function canFindThree() {

    var result = false;

    $.each([1, 2, 3, 4, 5], function(key, value) { 
        if(value === 3) {
            result = true;
            return false; //This will only exit the anonymous function and stop the iteration immediatelly.
        }
    });

    return result; //This will exit the function with return true;
}

Removing viewcontrollers from navigation stack

Swift 5:

navigationController?.viewControllers.removeAll(where: { (vc) -> Bool in
    if vc.isKind(of: MyViewController.self) || vc.isKind(of: MyViewController2.self) {
        return false
    } else {
        return true
    }
})

Why specify @charset "UTF-8"; in your CSS file?

It tells the browser to read the css file as UTF-8. This is handy if your CSS contains unicode characters and not only ASCII.

Using it in the meta tag is fine, but only for pages that include that meta tag.

Read about the rules for character set resolution of CSS files at the w3c spec for CSS 2.

What does "@" mean in Windows batch scripts

Another useful time to include @ is when you use FOR in the command line. For example:

FOR %F IN (*.*) DO ECHO %F

Previous line show for every file: the command prompt, the ECHO command, and the result of ECHO command. This way:

FOR %F IN (*.*) DO @ECHO %F

Just the result of ECHO command is shown.

What is the meaning of "operator bool() const"

I'd like to give more codes to make it clear.

struct A
{
    operator bool() const { return true; }
};

struct B
{
    explicit operator bool() const { return true; }
};

int main()
{
    A a1;
    if (a1) cout << "true" << endl; // OK: A::operator bool()
    bool na1 = a1; // OK: copy-initialization selects A::operator bool()
    bool na2 = static_cast<bool>(a1); // OK: static_cast performs direct-initialization

    B b1;     
    if (b1) cout << "true" << endl; // OK: B::operator bool()
    // bool nb1 = b1; // error: copy-initialization does not consider B::operator bool()
    bool nb2 = static_cast<bool>(b1); // OK: static_cast performs direct-initialization
}

java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to com.testing.models.Account

When you use jackson to map from string to your concrete class, especially if you work with generic type. then this issue may happen because of different class loader. i met it one time with below scenarior:

Project B depend on Library A

in Library A:

public class DocSearchResponse<T> {
 private T data;
}

it has service to query data from external source, and use jackson to convert to concrete class

public class ServiceA<T>{
  @Autowired
  private ObjectMapper mapper;
  @Autowired
  private ClientDocSearch searchClient;

  public DocSearchResponse<T> query(Criteria criteria){
      String resultInString = searchClient.search(criteria);
      return convertJson(resultInString)
  }
}

public DocSearchResponse<T> convertJson(String result){
     return mapper.readValue(result, new TypeReference<DocSearchResponse<T>>() {});
  }
}

in Project B:

public class Account{
 private String name;
 //come with other attributes
}

and i use ServiceA from library to make query and as well convert data

public class ServiceAImpl extends ServiceA<Account> {
    
}

and make use of that

public class MakingAccountService {
    @Autowired
    private ServiceA service;
    public void execute(Criteria criteria){
      
        DocSearchResponse<Account> result = service.query(criteria);
        Account acc = result.getData(); //  java.util.LinkedHashMap cannot be cast to com.testing.models.Account
    }
}

it happen because from classloader of LibraryA, jackson can not load Account class, then just override method convertJson in Project B to let jackson do its job

public class ServiceAImpl extends ServiceA<Account> {
        @Override
        public DocSearchResponse<T> convertJson(String result){
         return mapper.readValue(result, new TypeReference<DocSearchResponse<T>>() {});
      }
    }
 }

How to find index position of an element in a list when contains returns true

 
benefit.indexOf(map4)

It either returns an index or -1 if the items is not found.

I strongly recommend wrapping the map in some object and use generics if possible.

How to exclude 0 from MIN formula Excel

All you have to do is to delete the "0" in the cells that contain just that and try again. That should work.

Adding two numbers concatenates them instead of calculating the sum

You are missing the type conversion during the addition step...
var x = y + z; should be var x = parseInt(y) + parseInt(z);

 <!DOCTYPE html>

 <html>
 <body>
  <p>Click the button to calculate x.</p>
  <button onclick="myFunction()">Try it</button>
  <br/>
  <br/>Enter first number:
  <input type="text" id="txt1" name="text1">Enter second number:
  <input type="text" id="txt2" name="text2">
  <p id="demo"></p>
 <script>
    function myFunction() 
    {
      var y = document.getElementById("txt1").value;
      var z = document.getElementById("txt2").value;
      var x = parseInt(y) + parseInt(z);
      document.getElementById("demo").innerHTML = x;
    }
 </script>
 </body>
 </html>

Explain the concept of a stack frame in a nutshell

A quick wrap up. Maybe someone has a better explanation.

A call stack is composed of 1 or many several stack frames. Each stack frame corresponds to a call to a function or procedure which has not yet terminated with a return.

To use a stack frame, a thread keeps two pointers, one is called the Stack Pointer (SP), and the other is called the Frame Pointer (FP). SP always points to the "top" of the stack, and FP always points to the "top" of the frame. Additionally, the thread also maintains a program counter (PC) which points to the next instruction to be executed.

The following are stored on the stack: local variables and temporaries, actual parameters of the current instruction (procedure, function, etc.)

There are different calling conventions regarding the cleaning of the stack.

What is the difference between a field and a property?

Properties expose fields. Fields should (almost always) be kept private to a class and accessed via get and set properties. Properties provide a level of abstraction allowing you to change the fields while not affecting the external way they are accessed by the things that use your class.

public class MyClass
{
    // this is a field.  It is private to your class and stores the actual data.
    private string _myField;

    // this is a property. When accessed it uses the underlying field,
    // but only exposes the contract, which will not be affected by the underlying field
    public string MyProperty
    {
        get
        {
            return _myField;
        }
        set
        {
            _myField = value;
        }
    }

    // This is an AutoProperty (C# 3.0 and higher) - which is a shorthand syntax
    // used to generate a private field for you
    public int AnotherProperty { get; set; } 
}

@Kent points out that Properties are not required to encapsulate fields, they could do a calculation on other fields, or serve other purposes.

@GSS points out that you can also do other logic, such as validation, when a property is accessed, another useful feature.

Equivalent of Oracle's RowID in SQL Server

Check out the new ROW_NUMBER function. It works like this:

SELECT ROW_NUMBER() OVER (ORDER BY EMPID ASC) AS ROWID, * FROM EMPLOYEE

functional way to iterate over range (ES6/7)

One can create an empty array, fill it (otherwise map will skip it) and then map indexes to values:

Array(8).fill().map((_, i) => i * i);

How to output oracle sql result into a file in windows?

just to make the Answer 2 much easier, you can also define the folder where you can put your saved file

    spool /home/admin/myoutputfile.txt
    select * from table_name;
    spool off;

after that only with nano or vi myoutputfile.txt, you will see all the sql track.

hope is that help :)

Handling of non breaking space: <p>&nbsp;</p> vs. <p> </p>

If I understand your issue this should work

&emsp—the em space; this should be a very wide space, typically as much as four real spaces. &ensp—the en space; this should be a somewhat wide space, roughly two regular spaces. &thinsp—this will be a narrow space, even more narrow than a regular space.

Sources: http://hea-www.harvard.edu/~fine/Tech/html-sentences.html

How to Call a JS function using OnClick event

Using the onclick attribute or applying a function to your JS onclick properties will erase your onclick initialization in <head>.

What you need to do is add click events on your button. To do that you’ll need the addEventListener or attachEvent (IE) method.

<!DOCTYPE html>
<html>
<head>
    <script>
        function addEvent(obj, event, func) {
            if (obj.addEventListener) {
                obj.addEventListener(event, func, false);
                return true;
            } else if (obj.attachEvent) {
                obj.attachEvent('on' + event, func);
            } else {
                var f = obj['on' + event];
                obj['on' + event] = typeof f === 'function' ? function() {
                    f();
                    func();
                } : func
            }
        }

        function f1()
        {
            alert("f1 called");
            //form validation that recalls the page showing with supplied inputs.    
        }
    </script>
</head>
<body>
    <form name="form1" id="form1" method="post">
        State: <select id="state ID">
        <option></option>
        <option value="ap">ap</option>
        <option value="bp">bp</option>
        </select>
    </form>

    <table><tr><td id="Save" onclick="f1()">click</td></tr></table>

    <script>
        addEvent(document.getElementById('Save'), 'click', function() {
            alert('hello');
        });
    </script>
</body>
</html>

Read/Write 'Extended' file properties (C#)

There's a CodeProject article for an ID3 reader. And a thread at kixtart.org that has more information for other properties. Basically, you need to call the GetDetailsOf() method on the folder shell object for shell32.dll.

Best way to save a trained model in PyTorch?

The pickle Python library implements binary protocols for serializing and de-serializing a Python object.

When you import torch (or when you use PyTorch) it will import pickle for you and you don't need to call pickle.dump() and pickle.load() directly, which are the methods to save and to load the object.

In fact, torch.save() and torch.load() will wrap pickle.dump() and pickle.load() for you.

A state_dict the other answer mentioned deserves just few more notes.

What state_dict do we have inside PyTorch? There are actually two state_dicts.

The PyTorch model is torch.nn.Module has model.parameters() call to get learnable parameters (w and b). These learnable parameters, once randomly set, will update over time as we learn. Learnable parameters are the first state_dict.

The second state_dict is the optimizer state dict. You recall that the optimizer is used to improve our learnable parameters. But the optimizer state_dict is fixed. Nothing to learn in there.

Because state_dict objects are Python dictionaries, they can be easily saved, updated, altered, and restored, adding a great deal of modularity to PyTorch models and optimizers.

Let's create a super simple model to explain this:

import torch
import torch.optim as optim

model = torch.nn.Linear(5, 2)

# Initialize optimizer
optimizer = optim.SGD(model.parameters(), lr=0.001, momentum=0.9)

print("Model's state_dict:")
for param_tensor in model.state_dict():
    print(param_tensor, "\t", model.state_dict()[param_tensor].size())

print("Model weight:")    
print(model.weight)

print("Model bias:")    
print(model.bias)

print("---")
print("Optimizer's state_dict:")
for var_name in optimizer.state_dict():
    print(var_name, "\t", optimizer.state_dict()[var_name])

This code will output the following:

Model's state_dict:
weight   torch.Size([2, 5])
bias     torch.Size([2])
Model weight:
Parameter containing:
tensor([[ 0.1328,  0.1360,  0.1553, -0.1838, -0.0316],
        [ 0.0479,  0.1760,  0.1712,  0.2244,  0.1408]], requires_grad=True)
Model bias:
Parameter containing:
tensor([ 0.4112, -0.0733], requires_grad=True)
---
Optimizer's state_dict:
state    {}
param_groups     [{'lr': 0.001, 'momentum': 0.9, 'dampening': 0, 'weight_decay': 0, 'nesterov': False, 'params': [140695321443856, 140695321443928]}]

Note this is a minimal model. You may try to add stack of sequential 

model = torch.nn.Sequential(
          torch.nn.Linear(D_in, H),
          torch.nn.Conv2d(A, B, C)
          torch.nn.Linear(H, D_out),
        )

Note that only layers with learnable parameters (convolutional layers, linear layers, etc.) and registered buffers (batchnorm layers) have entries in the model's state_dict.

Non learnable things, belong to the optimizer object state_dict, which contains information about the optimizer's state, as well as the hyperparameters used.

The rest of the story is the same; in the inference phase (this is a phase when we use the model after training) for predicting; we do predict based on the parameters we learned. So for the inference, we just need to save the parameters model.state_dict().

torch.save(model.state_dict(), filepath)

And to use later model.load_state_dict(torch.load(filepath)) model.eval()

Note: Don't forget the last line model.eval() this is crucial after loading the model.

Also don't try to save torch.save(model.parameters(), filepath). The model.parameters() is just the generator object.

On the other side, torch.save(model, filepath) saves the model object itself, but keep in mind the model doesn't have the optimizer's state_dict. Check the other excellent answer by @Jadiel de Armas to save the optimizer's state dict.

How can I create a keystore?

I'd like to suggest automatic way with gradle only

** Define also at least one additional param for keystore in last command e.g. country '-dname', 'c=RU' **

apply plugin: 'com.android.application'

// define here sign properties
def sPassword = 'storePassword_here'
def kAlias = 'keyAlias_here'
def kPassword = 'keyPassword_here'

android {
    ...
    signingConfigs {
        release {
            storeFile file("keystore/release.jks")
            storePassword sPassword
            keyAlias kAlias
            keyPassword kPassword
        }
    }
    buildTypes {
        debug {
            signingConfig signingConfigs.release
        }
        release {
            shrinkResources true
            minifyEnabled true
            useProguard true
            signingConfig signingConfigs.release
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    ...
}

...

task generateKeystore() {
    exec {
        workingDir projectDir
        commandLine 'mkdir', '-p', 'keystore'
    }
    exec {
        workingDir projectDir
        commandLine 'rm', '-f', 'keystore/release.jks'
    }
    exec {
        workingDir projectDir
        commandLine 'keytool', '-genkey', '-noprompt', '-keystore', 'keystore/release.jks',
            '-alias', kAlias, '-storepass', sPassword, '-keypass', kPassword, '-dname', 'c=RU',
            '-keyalg', 'RSA', '-keysize', '2048', '-validity', '10000'
    }
}

project.afterEvaluate {
    preBuild.dependsOn generateKeystore
}

This will generate keystore on project sync and build

> Task :app:generateKeystore UP-TO-DATE
> Task :app:preBuild UP-TO-DATE

Regex for remove everything after | (with | )

If you want to get everything after | excluding set character use this code.

[^|]*$

Others solutions \|.*$

Results : | mypcworld

This one [^|]*$

Results : mypcworld

http://regexr.com/3elkd

CSS width of a <span> tag

Like in other answers, start your span attributes with this:

display:inline-block;

Now you can use padding more than width:

padding-left:6%;
padding-right:6%;

When you use padding, your color expands to both side (right and left), not just right (like in widht).

Align image in center and middle within div

Just set parent div css property "text-align:center;" 

 <div style="text-align:center; width:100%">
        <img src="img.png"> 
 </div>

How I can check if an object is null in ruby on rails 2?

In your example, you can simply replace null with `nil and it will work fine.

require 'erb'

template = <<EOS
<% if (@objectname != nil) then %>
  @objectname is not nil
<% else %>
  @objectname is nil
<% end %>
EOS

@objectname = nil
ERB.new(template, nil, '>').result # => "  @objectname is nil\n"

@objectname = 'some name'
ERB.new(template, nil, '>').result # => "  @objectname is not nil\n"

Contrary to what the other poster said, you can see above that then works fine in Ruby. It's not common, but it is fine.

#blank? and #present? have other implications. Specifically, if the object responds to #empty?, they will check whether it is empty. If you go to http://api.rubyonrails.org/ and search for "blank?", you will see what objects it is defined on and how it works. Looking at the definition on Object, we see "An object is blank if it’s false, empty, or a whitespace string. For example, “”, “ ”, nil, [], and {} are all blank." You should make sure that this is what you want.

Also, nil is considered false, and anything other than false and nil is considered true. This means you can directly place the object in the if statement, so a more canonical way of writing the above would be

require 'erb'

template = <<EOS
<% if @objectname %>
  @objectname is not nil
<% else %>
  @objectname is nil
<% end %>
EOS

@objectname = nil
ERB.new(template, nil, '>').result # => "  @objectname is nil\n"

@objectname = 'some name'
ERB.new(template, nil, '>').result # => "  @objectname is not nil\n"

If you explicitly need to check nil and not false, you can use the #nil? method, for which nil is the only object that will cause this to return true.

nil.nil?          # => true
false.nil?        # => false
Object.new.nil?   # => false

Usage of MySQL's "IF EXISTS"

 
SELECT IF((
     SELECT count(*) FROM gdata_calendars 
     WHERE `group` =  ? AND id = ?)
,1,0);

For Detail explanation you can visit here

Can I run a 64-bit VMware image on a 32-bit machine?

VMware? No. However, QEMU has an x86_64 system target that you can use. You likely won't be able to use a VMware image directly (IIRC, there's no conversion tool), but you can install the OS and such yourself and work inside it. QEMU can be a bit of a PITA to get up and running, but it tends to work quite nicely.

Javascript: How to remove the last character from a div or a string?

Are u sure u want to remove only last character. What if the user press backspace from the middle of the word.. Its better to get the value from the field and replace the divs html. On keyup

$("#div").html($("#input").val());

What are advantages of Artificial Neural Networks over Support Vector Machines?

One thing to note is that the two are actually very related. Linear SVMs are equivalent to single-layer NN's (i.e., perceptrons), and multi-layer NNs can be expressed in terms of SVMs. See here for some details.

How to push objects in AngularJS between ngRepeat arrays

You'd be much better off using the same array with both lists, and creating angular filters to achieve your goal.

http://docs.angularjs.org/guide/dev_guide.templates.filters.creating_filters

Rough, untested code follows:

appModule.filter('checked', function() {
    return function(input, checked) {
        if(!input)return input;
        var output = []
        for (i in input){
            var item = input[i];
            if(item.checked == checked)output.push(item);
        }
        return output
    }
});

and the view (i added an "uncheck" button too)

<div id="AddItem">
     <h3>Add Item</h3>

    <input value="1" type="number" placeholder="1" ng-model="itemAmount">
    <input value="" type="text" placeholder="Name of Item" ng-model="itemName">
    <br/>
    <button ng-click="addItem()">Add to list</button>
</div>
<!-- begin: LIST OF CHECKED ITEMS -->
<div id="CheckedList">
     <h3>Checked Items: {{getTotalCheckedItems()}}</h3>

     <h4>Checked:</h4>

    <table>
        <tr ng-repeat="item in items | checked:true" class="item-checked">
            <td><b>amount:</b> {{item.amount}} -</td>
            <td><b>name:</b> {{item.name}} -</td>
            <td> 
               <i>this item is checked!</i>
               <button ng-click="item.checked = false">uncheck item</button>

            </td>
        </tr>
    </table>
</div>
<!-- end: LIST OF CHECKED ITEMS -->
<!-- begin: LIST OF UNCHECKED ITEMS -->
<div id="UncheckedList">
     <h3>Unchecked Items: {{getTotalItems()}}</h3>

     <h4>Unchecked:</h4>

    <table>
        <tr ng-repeat="item in items | checked:false" class="item-unchecked">
            <td><b>amount:</b> {{item.amount}} -</td>
            <td><b>name:</b> {{item.name}} -</td>
            <td>
                <button ng-click="item.checked = true">check item</button>
            </td>
        </tr>
    </table>
</div>
<!-- end: LIST OF ITEMS -->

Then you dont need the toggle methods etc in your controller

PHP JSON String, escape Double Quotes for JS output

I succefully just did this : 

$json = str_replace("\u0022","\\\\\"",json_encode( $phpArray,JSON_HEX_QUOT));

json_encode() by default will escape " to \" . But it's still wrong JSON for json.PARSE(). So by adding option JSON_HEX_QUOT, json_encode() will replace " with \u0022. json.PARSE() still will not like \u0022. So then we need to replace \u0022 with \\". The \\\\\" is escaped \\".

NOTE : you can add option JSON_HEX_APOS to replace single quote with unicode HEX value if you have javascript single quote issue.

ex: json_encode( $phpArray, JSON_HEX_APOS|JSON_HEX_QUOT ));

select data up to a space?

 
select left(col, charindex(' ', col) - 1)

`node-pre-gyp install --fallback-to-build` failed during MeanJS installation on OSX

russfrisch commented 4 days ago:

I was experiencing this same issue. Changing in the version for grunt-node-inspector to prepend a ">=" instead of a "~" got this to work for me.

Link to github page where I found this solution.

Link to my post on StackoverFlow