error TS1086: An accessor cannot be declared in an ambient context in Angular 9

I had this problem but didn't have a version conflict in my package.json.

My package-lock.json was somehow out of sync with package json though. Deleting and regenerating it worked for me.

What is the default username and password in Tomcat?

Open tomcat-users.xml which should be in C:\Tomcat 7.0\conf

Add following lines in above file :

<tomcat-users>
     <role rolename="manager-gui"/>
     <user username="admin" password="" roles="manager-gui"/>

     <role rolename="admin-gui"/>
     <user username="tomcat" password="s3cret" roles="admin-gui"/>        
 </tomcat-users>

Note :

admin-gui -> Username & Password - Do not Change.
manager-gui -> you can change user name & password for this only. [Here password is not given]

Redirect to a page/URL after alert button is pressed

<head>
<script>
    function myFunction() {
        var x;
        var r = confirm("Do you want to clear data?");
        if (r == true) {
            x = "Your Data is Cleared";
            window.location.href = "firstpage.php";
        }
        else {
            x = "You pressed Cancel!";
        }
        document.getElementById("demo").innerHTML = x;
    }
</script>
</head>
<body>
<button onclick="myFunction()">Retest</button>

<p id="demo"></p>
</body>
</html>

This will redirect to new php page.

How to get the Android Emulator's IP address?

public String getLocalIpAddress() {

    try {
        for (Enumeration < NetworkInterface > en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
            NetworkInterface intf = en.nextElement();
            for (Enumeration < InetAddress > enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
                InetAddress inetAddress = enumIpAddr.nextElement();
                if (!inetAddress.isLoopbackAddress()) {
                    return inetAddress.getHostAddress().toString();
                }
            }
        }
    } catch (SocketException ex) {
        Log.e(LOG_TAG, ex.toString());
    }
    return null;
}

How do I check my gcc C++ compiler version for my Eclipse?

The answer is:

gcc --version

Rather than searching on forums, for any possible option you can always type:

gcc --help

haha! :)

How to add "on delete cascade" constraints?

Based off of @Mike Sherrill Cat Recall's answer, this is what worked for me:

ALTER TABLE "Children"
DROP CONSTRAINT "Children_parentId_fkey",
ADD CONSTRAINT "Children_parentId_fkey"
  FOREIGN KEY ("parentId")
  REFERENCES "Parent"(id)
  ON DELETE CASCADE;

How can I group data with an Angular filter?

In addition to the accepted answer you can use this if you want to group by multiple columns:

<ul ng-repeat="(key, value) in players | groupBy: '[team,name]'">

Convert pandas DataFrame into list of lists

EDIT: as_matrix is deprecated since version 0.23.0

You can use the built in values or to_numpy (recommended option) method on the dataframe:

In [8]:
df.to_numpy()

Out[8]:
array([[  0.9,   7. ,   5.2, ...,  13.3,  13.5,   8.9],
   [  0.9,   7. ,   5.2, ...,  13.3,  13.5,   8.9],
   [  0.8,   6.1,   5.4, ...,  15.9,  14.4,   8.6],
   ..., 
   [  0.2,   1.3,   2.3, ...,  16.1,  16.1,  10.8],
   [  0.2,   1.3,   2.4, ...,  16.5,  15.9,  11.4],
   [  0.2,   1.3,   2.4, ...,  16.5,  15.9,  11.4]])

If you explicitly want lists and not a numpy array add .tolist():

df.to_numpy().tolist()

Generating a SHA-256 hash from the Linux command line

echo produces a trailing newline character which is hashed too. Try:

/bin/echo -n foobar | sha256sum

Bulk load data conversion error (type mismatch or invalid character for the specified codepage) for row 1, column 4 (Year)

Try using a format file since your data file only has 4 columns. Otherwise, try OPENROWSET or use a staging table.

myTestFormatFiles.Fmt may look like:

9.0
4
1       SQLINT        0       3       ","      1     StudentNo      ""
2       SQLCHAR       0       100     ","      2     FirstName      SQL_Latin1_General_CP1_CI_AS
3       SQLCHAR       0       100     ","      3     LastName       SQL_Latin1_General_CP1_CI_AS
4       SQLINT        0       4       "\r\n"   4     Year           "

_{(source: microsoft.com)}

This tutorial on skipping a column with BULK INSERT may also help.

Your statement then would look like:

USE xta9354
GO
BULK INSERT xta9354.dbo.Students
    FROM 'd:\userdata\xta9_Students.txt' 
    WITH (FORMATFILE = 'C:\myTestFormatFiles.Fmt')

How to convert an array to a string in PHP?

I would turn it into CSV form, like so:

$string_version = implode(',', $original_array)

You can turn it back by doing:

$destination_array = explode(',', $string_version)

How do I check whether input string contains any spaces?

You can use this code to check whether the input string contains any spaces?

public static void main(String[]args)
{
    Scanner sc=new Scanner(System.in);
    System.out.println("enter the string...");
    String s1=sc.nextLine();
    int l=s1.length();
    int count=0;
    for(int i=0;i<l;i++)
    {
        char c=s1.charAt(i);
        if(c==' ')
        {
        System.out.println("spaces are in the position of "+i);
        System.out.println(count++);
        }
        else
        {
        System.out.println("no spaces are there");
    }
}

Javascript: How to detect if browser window is scrolled to bottom?

How to get the URL of the current page in C#

if you just want the part between http:// and the first slash

string url = Request.Url.Host;

would return stackoverflow.com if called from this page

Here's the complete breakdown

Angular2 Error: There is no directive with "exportAs" set to "ngForm"

Also realized this problem comes up when trying to combine reactive form and template form approaches. I had #name="ngModel" and [formControl]="name" on the same element. Removing either one fixed the issue. Also not that if you use #name=ngModel you should also have a property such as this [(ngModel)]="name" , otherwise, You will still get the errors. This applies to angular 6, 7 and 8 too.

Select all text inside EditText when it gets focus

Just add this to your editText in the .xml file

android:selectAllOnFocus="true"

Kill a postgresql session/connection

MacOS, if postgresql was installed with brew:

brew services restart postgresql

Source: Kill a postgresql session/connection

How to set alignment center in TextBox in ASP.NET?

Add the css styling text-align: center to the control.

Ideally you would do this through a css class assigned to the control, but if you must do it directly, here is an example:

<asp:TextBox ID="myTextBox" runat="server" style="text-align: center"></asp:TextBox>

How to check if another instance of the application is running

Want some serious code? Here it is.

var exists = System.Diagnostics.Process.GetProcessesByName(System.IO.Path.GetFileNameWithoutExtension(System.Reflection.Assembly.GetEntryAssembly().Location)).Count() > 1;

This works for any application (any name) and will become true if there is another instance running of the same application.

Edit: To fix your needs you can use either of these:

if (System.Diagnostics.Process.GetProcessesByName(System.IO.Path.GetFileNameWithoutExtension(System.Reflection.Assembly.GetEntryAssembly().Location)).Count() > 1) return;

from your Main method to quit the method... OR

if (System.Diagnostics.Process.GetProcessesByName(System.IO.Path.GetFileNameWithoutExtension(System.Reflection.Assembly.GetEntryAssembly().Location)).Count() > 1) System.Diagnostics.Process.GetCurrentProcess().Kill();

which will kill the currently loading process instantly.

You need to add a reference to System.Core.dll for the .Count() extension method. Alternatively, you can use the .Length property.

ASP.NET: Session.SessionID changes between requests

In my case this was happening a lot in my development and test environments. After trying all of the above solutions without any success I found that I was able to fix this problem by deleting all session cookies. The web developer extension makes this very easy to do. I mostly use Firefox for testing and development, but this also happened while testing in Chrome. The fix also worked in Chrome.

I haven't had to do this yet in the production environment and have not received any reports of people not being able to log in. This also only seemed to happen after making the session cookies to be secure. It never happened in the past when they were not secure.

How to grab substring before a specified character jQuery or JavaScript

var streetaddress= addy.substr(0, addy.indexOf(','));

While it's not the best place for definitive information on what each method does (mozilla developer network is better for that) w3schools.com is good for introducing you to syntax.

Trigger a Travis-CI rebuild without pushing a commit?

If you have write access to the repo: On the build's detail screen, there is a button ? Restart Build. Also under "More Options" there is a trigger build menu item.

Note: Browser extensions like Ghostery may prevent the restart button from being displayed. Try disabling the extension or white-listing Travis CI.

Note2: If .travis.yml configuration has changed in the upstream, clicking rebuild button will run travis with old configuration. To apply upstream changes for travis configuration one has to add commit to PR or to close / reopen it.
If you've sent a pull request: You can close the PR then open it again. This will trigger a new build.

Restart Build:

Trigger Build:

Jquery and HTML FormData returns "Uncaught TypeError: Illegal invocation"

jQuery processes the data attribute and converts the values into strings.

Adding processData: false to your options object fixes the error, but I'm not sure if it fixes the problem.

Demo: http://jsfiddle.net/eHmSr/1/

How to enable scrolling of content inside a modal?

.modal-body {
    max-height: 80vh;
    overflow-y: scroll;
}

it's works for me

How to block until an event is fired in c#

If you're happy to use the Microsoft Reactive Extensions, then this can work nicely:

public class Foo
{
    public delegate void MyEventHandler(object source, MessageEventArgs args);
    public event MyEventHandler _event;
    public string ReadLine()
    {
        return Observable
            .FromEventPattern<MyEventHandler, MessageEventArgs>(
                h => this._event += h,
                h => this._event -= h)
            .Select(ep => ep.EventArgs.Message)
            .First();
    }
    public void SendLine(string message)
    {
        _event(this, new MessageEventArgs() { Message = message });
    }
}

public class MessageEventArgs : EventArgs
{
    public string Message;
}

I can use it like this:

var foo = new Foo();

ThreadPoolScheduler.Instance
    .Schedule(
        TimeSpan.FromSeconds(5.0),
        () => foo.SendLine("Bar!"));

var resp = foo.ReadLine();

Console.WriteLine(resp);

I needed to call the SendLine message on a different thread to avoid locking, but this code shows that it works as expected.

WPF: simple TextBox data binding

Name2 is a field. WPF binds only to properties. Change it to:

public string Name2 { get; set; }

Be warned that with this minimal implementation, your TextBox won't respond to programmatic changes to Name2. So for your timer update scenario, you'll need to implement INotifyPropertyChanged:

partial class Window1 : Window, INotifyPropertyChanged
{
  public event PropertyChangedEventHandler PropertyChanged;

  protected void OnPropertyChanged(string propertyName)
  {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
  }

  private string _name2;

  public string Name2
  {
    get { return _name2; }
    set
    {
      if (value != _name2)
      {
         _name2 = value;
         OnPropertyChanged("Name2");
      }
    }
  }
}

You should consider moving this to a separate data object rather than on your Window class.

Search an Oracle database for tables with specific column names?

The data you want is in the "cols" meta-data table:

SELECT * FROM COLS WHERE COLUMN_NAME = 'id'

This one will give you a list of tables that have all of the columns you want:

select distinct
  C1.TABLE_NAME
from
  cols c1
  inner join
  cols c2
  on C1.TABLE_NAME = C2.TABLE_NAME
  inner join
  cols c3
  on C2.TABLE_NAME = C3.TABLE_NAME
  inner join
  cols c4
  on C3.TABLE_NAME = C4.TABLE_NAME  
  inner join
  tab t
  on T.TNAME = C1.TABLE_NAME
where T.TABTYPE = 'TABLE' --could be 'VIEW' if you wanted
  and upper(C1.COLUMN_NAME) like upper('%id%')
  and upper(C2.COLUMN_NAME) like upper('%fname%')
  and upper(C3.COLUMN_NAME) like upper('%lname%')
  and upper(C4.COLUMN_NAME) like upper('%address%')

To do this in a different schema, just specify the schema in front of the table, as in

SELECT * FROM SCHEMA1.COLS WHERE COLUMN_NAME LIKE '%ID%';

If you want to combine the searches of many schemas into one output result, then you could do this:

SELECT DISTINCT
  'SCHEMA1' AS SCHEMA_NAME
 ,TABLE_NAME
FROM SCHEMA1.COLS
WHERE COLUMN_NAME LIKE '%ID%'
UNION
SELECT DISTINCT
  'SCHEMA2' AS SCHEMA_NAME
 ,TABLE_NAME
FROM SCHEMA2.COLS
WHERE COLUMN_NAME LIKE '%ID%'

Check folder size in Bash

To check the size of all of the directories within a directory, you can use:

du -h --max-depth=1

How do I remove a MySQL database?

If you are working in XAMPP and your query of drop database doesn't work then you can go to the operations tag where you find the column (drop the database(drop)), click that button and your database will be deleted.

how to refresh page in angular 2

Updated

How to implement page refresh in Angular 2+ note this is done within your component:

location.reload();

Text border using css (border around text)

Use multiple text shadows:

text-shadow: 2px 0 0 #fff, -2px 0 0 #fff, 0 2px 0 #fff, 0 -2px 0 #fff, 1px 1px #fff, -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff;

enter image description here

_x000D_

body {_x000D_
  font-family: sans-serif;_x000D_
  background: #222;_x000D_
  color: darkred;_x000D_
  }_x000D_
h1 {_x000D_
  text-shadow: 2px 0 0 #fff, -2px 0 0 #fff, 0 2px 0 #fff, 0 -2px 0 #fff, 1px 1px #fff, -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff;_x000D_
}

_x000D_

<h1>test</h1>

_x000D_

Alternatively, you could use text stroke, which only works in webkit:

-webkit-text-stroke-width: 2px;
-webkit-text-stroke-color: #fff;

enter image description here

_x000D_

body {_x000D_
  font-family: sans-serif;_x000D_
  background: #222;_x000D_
  color: darkred;_x000D_
  }_x000D_
h1 {_x000D_
  -webkit-text-stroke-width: 2px;_x000D_
-webkit-text-stroke-color: #fff;_x000D_
}

_x000D_

<h1>test</h1>

_x000D_

What are all codecs and formats supported by FFmpeg?

ffmpeg -codecs

should give you all the info about the codecs available.

You will see some letters next to the codecs:

Codecs:
 D..... = Decoding supported
 .E.... = Encoding supported
 ..V... = Video codec
 ..A... = Audio codec
 ..S... = Subtitle codec
 ...I.. = Intra frame-only codec
 ....L. = Lossy compression
 .....S = Lossless compression

How do I apply the for-each loop to every character in a String?

String s = "xyz";
for(int i = 0; i < s.length(); i++)
{
   char c = s.charAt(i);
}

Show default value in Spinner in android

Try below:

   <Spinner
    android:id="@+id/YourSpinnerId"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:prompt="Gender" />

Arrays.fill with multidimensional array in Java

Arrays.fill works with single dimensional array, so to fill two dimensional array we can do below

for (int i = 0, len = arr.length; i < len; i++)
    Arrays.fill(arr[i], 0);

How to append output to the end of a text file

To append a file use >>

echo "hello world"  >> read.txt   
cat read.txt     
echo "hello siva" >> read.txt   
cat read.txt

then the output should be

hello world   # from 1st echo command
hello world   # from 2nd echo command
hello siva

To overwrite a file use >

echo "hello tom" > read.txt
cat read.txt

then the out put is

hello tom

How do I enable --enable-soap in php on linux?

In case that you have Ubuntu in your machine, the following steps will help you:

Check first in your php testing file if you have soap (client / server)or not by using phpinfo(); and check results in the browser. In case that you have it, it will seems like the following image ( If not go to step 2 ):

Open your terminal and paste: sudo apt-get install php-soap.
Restart your apache2 server in terminal : service apache2 restart.
To check use your php test file again to be seems like mine in step 1.

Importing CSV File to Google Maps

GPS Visualizer has an interface by which you can cut and paste a CSV file and convert it to kml:

http://www.gpsvisualizer.com/map_input?form=googleearth

Then use Google Earth. If you don't have Google Earth and want to display it online I found another nifty service that will plot kml files online:

http://display-kml.appspot.com/

Conditional WHERE clause with CASE statement in Oracle

You can write the where clause as:

where (case when (:stateCode = '') then (1)
            when (:stateCode != '') and (vw.state_cd in (:stateCode)) then 1
            else 0)
       end) = 1;

Alternatively, remove the case entirely:

where (:stateCode = '') or
      ((:stateCode != '') and vw.state_cd in (:stateCode));

Or, even better:

where (:stateCode = '') or vw.state_cd in (:stateCode)

How to remove an HTML element using Javascript?

What's happening is that the form is getting submitted, and so the page is being refreshed (with its original content). You're handling the click event on a submit button.

If you want to remove the element and not submit the form, handle the submit event on the form instead, and return false from your handler:

HTML:

<form  onsubmit="return removeDummy(); ">
    <input type="submit" value="Remove DUMMY"/>
</form>

JavaScript:

function removeDummy() {
    var elem = document.getElementById('dummy');
    elem.parentNode.removeChild(elem);
    return false;
}

But you don't need (or want) a form for that at all, not if its sole purpose is to remove the dummy div. Instead:

HTML:

<input type="button" value="Remove DUMMY" onclick="removeDummy()" />

JavaScript:

function removeDummy() {
    var elem = document.getElementById('dummy');
    elem.parentNode.removeChild(elem);
    return false;
}

However, that style of setting up event handlers is old-fashioned. You seem to have good instincts in that your JavaScript code is in its own file and such. The next step is to take it further and avoid using onXYZ attributes for hooking up event handlers. Instead, in your JavaScript, you can hook them up with the newer (circa year 2000) way instead:

HTML:

<input id='btnRemoveDummy' type="button" value="Remove DUMMY"/>

JavaScript:

function removeDummy() {
    var elem = document.getElementById('dummy');
    elem.parentNode.removeChild(elem);
    return false;
}
function pageInit() {
    // Hook up the "remove dummy" button
    var btn = document.getElementById('btnRemoveDummy');
    if (btn.addEventListener) {
        // DOM2 standard
        btn.addEventListener('click', removeDummy, false);
    }
    else if (btn.attachEvent) {
        // IE (IE9 finally supports the above, though)
        btn.attachEvent('onclick', removeDummy);
    }
    else {
        // Really old or non-standard browser, try DOM0
        btn.onclick = removeDummy;
    }
}

...then call pageInit(); from a script tag at the very end of your page body (just before the closing </body> tag), or from within the window load event, though that happens very late in the page load cycle and so usually isn't good for hooking up event handlers (it happens after all images have finally loaded, for instance).

Note that I've had to put in some handling to deal with browser differences. You'll probably want a function for hooking up events so you don't have to repeat that logic every time. Or consider using a library like jQuery, Prototype, YUI, Closure, or any of several others to smooth over those browser differences for you. It's very important to understand the underlying stuff going on, both in terms of JavaScript fundamentals and DOM fundamentals, but libraries deal with a lot of inconsistencies, and also provide a lot of handy utilities — like a means of hooking up event handlers that deals with browser differences. Most of them also provide a way to set up a function (like pageInit) to run as soon as the DOM is ready to be manipulated, long before window load fires.

Finding square root without using sqrt function?

There is a better algorithm, which needs at most 6 iterations to converge to maximum precision for double numbers:

#include <math.h>

double sqrt(double x) {
    if (x <= 0)
        return 0;       // if negative number throw an exception?
    int exp = 0;
    x = frexp(x, &exp); // extract binary exponent from x
    if (exp & 1) {      // we want exponent to be even
        exp--;
        x *= 2;
    }
    double y = (1+x)/2; // first approximation
    double z = 0;
    while (y != z) {    // yes, we CAN compare doubles here!
        z = y;
        y = (y + x/y) / 2;
    }
    return ldexp(y, exp/2); // multiply answer by 2^(exp/2)
}

Algorithm starts with 1 as first approximation for square root value. Then, on each step, it improves next approximation by taking average between current value y and x/y. If y = sqrt(x), it will be the same. If y > sqrt(x), then x/y < sqrt(x) by about the same amount. In other words, it will converge very fast.

UPDATE: To speed up convergence on very large or very small numbers, changed sqrt() function to extract binary exponent and compute square root from number in [1, 4) range. It now needs frexp() from <math.h> to get binary exponent, but it is possible to get this exponent by extracting bits from IEEE-754 number format without using frexp().

Select first 10 distinct rows in mysql

Try this SELECT DISTINCT 10 * ...

How to change Angular CLI favicon

I was playing around with this for a little while. Turns out that the favicon is apparently handled by a node module called @scematics (at least in Angular5).

You can change your favicon in this folder:

[YourProjectName]\node_modules\@schematics\angular\application\files\__sourcedir__

In that folder there should be a favicon.ico, that's the one that is loaded. Im pretty shure this doesnt apply to everyone but it worked out for me.

Hope this helped. Happy coding! :D

Tkinter: "Python may not be configured for Tk"

You need to install tkinter for python3.

On Fedora pip3 install tkinter --user returns Could not find a version that satisfies the requirement... so I have to command: dnf install python3-tkinter. This have solved my problem

API pagination best practices

Option A: Keyset Pagination with a Timestamp

In order to avoid the drawbacks of offset pagination you have mentioned, you can use keyset based pagination. Usually, the entities have a timestamp that states their creation or modification time. This timestamp can be used for pagination: Just pass the timestamp of the last element as the query parameter for the next request. The server, in turn, uses the timestamp as a filter criterion (e.g. WHERE modificationDate >= receivedTimestampParameter)

{
    "elements": [
        {"data": "data", "modificationDate": 1512757070}
        {"data": "data", "modificationDate": 1512757071}
        {"data": "data", "modificationDate": 1512757072}
    ],
    "pagination": {
        "lastModificationDate": 1512757072,
        "nextPage": "https://domain.de/api/elements?modifiedSince=1512757072"
    }
}

This way, you won't miss any element. This approach should be good enough for many use cases. However, keep the following in mind:

You may run into endless loops when all elements of a single page have the same timestamp.
You may deliver many elements multiple times to the client when elements with the same timestamp are overlapping two pages.

You can make those drawbacks less likely by increasing the page size and using timestamps with millisecond precision.

Option B: Extended Keyset Pagination with a Continuation Token

To handle the mentioned drawbacks of the normal keyset pagination, you can add an offset to the timestamp and use a so-called "Continuation Token" or "Cursor". The offset is the position of the element relative to the first element with the same timestamp. Usually, the token has a format like Timestamp_Offset. It's passed to the client in the response and can be submitted back to the server in order to retrieve the next page.

{
    "elements": [
        {"data": "data", "modificationDate": 1512757070}
        {"data": "data", "modificationDate": 1512757072}
        {"data": "data", "modificationDate": 1512757072}
    ],
    "pagination": {
        "continuationToken": "1512757072_2",
        "nextPage": "https://domain.de/api/elements?continuationToken=1512757072_2"
    }
}

The token "1512757072_2" points to the last element of the page and states "the client already got the second element with the timestamp 1512757072". This way, the server knows where to continue.

Please mind that you have to handle cases where the elements got changed between two requests. This is usually done by adding a checksum to the token. This checksum is calculated over the IDs of all elements with this timestamp. So we end up with a token format like this: Timestamp_Offset_Checksum.

For more information about this approach check out the blog post "Web API Pagination with Continuation Tokens". A drawback of this approach is the tricky implementation as there are many corner cases that have to be taken into account. That's why libraries like continuation-token can be handy (if you are using Java/a JVM language). Disclaimer: I'm the author of the post and a co-author of the library.

Python can't find module in the same folder

I ran into this issue. I had three folders in the same directory so I had to specify which folder. Ex: from Folder import script

Define preprocessor macro through CMake?

To do this for a specific target, you can do the following:

target_compile_definitions(my_target PRIVATE FOO=1 BAR=1)

You should do this if you have more than one target that you're building and you don't want them all to use the same flags. Also see the official documentation on target_compile_definitions.

What are the differences between Visual Studio Code and Visual Studio?

One huge difference (for me) is that Visual Studio Code is one monitor only. With Visual Studio you can use multi-screen setups.

How do I create a comma-separated list using a SQL query?

I think we could write in the following way to retrieve(below code is just an example, please modify as needed):

Create FUNCTION dbo.ufnGetEmployeeMultiple(@DepartmentID int)
RETURNS VARCHAR(1000) AS

BEGIN

DECLARE @Employeelist varchar(1000)

SELECT @Employeelist = COALESCE(@Employeelist + ', ', '') + E.LoginID
FROM humanresources.Employee E

Left JOIN humanresources.EmployeeDepartmentHistory H ON
E.BusinessEntityID = H.BusinessEntityID

INNER JOIN HumanResources.Department D ON
H.DepartmentID = D.DepartmentID

Where H.DepartmentID = @DepartmentID

Return @Employeelist

END

SELECT D.name as Department, dbo.ufnGetEmployeeMultiple (D.DepartmentID)as Employees
FROM HumanResources.Department D

SELECT Distinct (D.name) as Department, dbo.ufnGetEmployeeMultiple (D.DepartmentID) as 
Employees
FROM HumanResources.Department D

What is RSS and VSZ in Linux memory management

RSS is Resident Set Size (physically resident memory - this is currently occupying space in the machine's physical memory), and VSZ is Virtual Memory Size (address space allocated - this has addresses allocated in the process's memory map, but there isn't necessarily any actual memory behind it all right now).

Note that in these days of commonplace virtual machines, physical memory from the machine's view point may not really be actual physical memory.

Why Anaconda does not recognize conda command?

I had a similar problem and I did something like the below mentioned steps with my Path environment variable to fix the problem

Located where my Anaconda3 was installed. I run Windows 7. Mine is located at C:\ProgramData\Anaconda3.

Open Control Panel - System - Advanced System Settings, under Advanced tab click on Environment Variables.

Under System Variables, located "Path" add the following: C:\ProgramData\Anaconda3\Scripts;C:\ProgramData\Anaconda3\;

Save and open new terminal. type in "conda". It worked for me.

Hope these steps help

Use sudo with password as parameter

echo -e "YOURPASSWORD\n" | sudo -S yourcommand

Use jQuery to get the file input's selected filename without the path

Get the first file from the control and then get the name of the file, it will ignore the file path on Chrome, and also will make correction of path for IE browsers. On saving the file, you have to use System.io.Path.GetFileName method to get the file name only for IE browsers

var fileUpload    = $("#ContentPlaceHolder1_FileUpload_mediaFile").get(0); 
var files         =  fileUpload.files; 
var mediafilename = ""; 

for (var i = 0; i < files.length; i++) { 
  mediafilename = files[i].name; 
}

Removing Conda environment

First deactivate the environment and come back to the base environment. From the base, you should be able to run the command conda env remove -n <envname>. This will give you the message

Remove all packages in environment C:\Users\<username>\AppData\Local\Continuum\anaconda3\envs\{envname}:

X close button only using css

Main point you are looking for is:

.tag-remove::before {
  content: 'x'; // here is your X(cross) sign.
  color: #fff;
  font-weight: 300;
  font-family: Arial, sans-serif;
}

FYI, you can make a close button by yourself very easily:

_x000D_

#mdiv {_x000D_
  width: 25px;_x000D_
  height: 25px;_x000D_
  background-color: red;_x000D_
  border: 1px solid black;_x000D_
}_x000D_
_x000D_
.mdiv {_x000D_
  height: 25px;_x000D_
  width: 2px;_x000D_
  margin-left: 12px;_x000D_
  background-color: black;_x000D_
  transform: rotate(45deg);_x000D_
  Z-index: 1;_x000D_
}_x000D_
_x000D_
.md {_x000D_
  height: 25px;_x000D_
  width: 2px;_x000D_
  background-color: black;_x000D_
  transform: rotate(90deg);_x000D_
  Z-index: 2;_x000D_
}

_x000D_

<div id="mdiv">_x000D_
  <div class="mdiv">_x000D_
    <div class="md"></div>_x000D_
  </div>_x000D_
</div>

_x000D_

Is there a command to refresh environment variables from the command prompt in Windows?

Use "setx" and restart cmd prompt

There is a command line tool named "setx" for this job. It's for reading and writing env variables. The variables persist after the command window has been closed.

It "Creates or modifies environment variables in the user or system environment, without requiring programming or scripting. The setx command also retrieves the values of registry keys and writes them to text files."

Note: variables created or modified by this tool will be available in future command windows but not in the current CMD.exe command window. So, you have to restart.

If setx is missing:

http://download.microsoft.com/download/win2000platform/setx/1.00.0.1/nt5/en-us/setx_setup.exe

Or modify the registry

MSDN says:

To programmatically add or modify system environment variables, add them to the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment registry key, then broadcast a WM_SETTINGCHANGE message with lParam set to the string "Environment".

This allows applications, such as the shell, to pick up your updates.

customize Android Facebook Login button

 <com.facebook.widget.LoginButton
            android:id="@+id/login_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            facebook:confirm_logout="false"
            facebook:fetch_user_info="true"
            android:text="testing 123"
            facebook:login_text=""
            facebook:logout_text=""
            />

This worked for me. To change the facebook login button text.

What does -Xmn jvm option stands for

From here:

-Xmn : the size of the heap for the young generation

Young generation represents all the objects which have a short life of time. Young generation objects are in a specific location into the heap, where the garbage collector will pass often. All new objects are created into the young generation region (called "eden"). When an object survive is still "alive" after more than 2-3 gc cleaning, then it will be swap has an "old generation" : they are "survivor".

And a more "official" source from IBM:

-Xmn

Sets the initial and maximum size of the new (nursery) heap to the specified value when using -Xgcpolicy:gencon. Equivalent to setting both -Xmns and -Xmnx. If you set either -Xmns or -Xmnx, you cannot set -Xmn. If you attempt to set -Xmn with either -Xmns or -Xmnx, the VM will not start, returning an error. By default, -Xmn is selected internally according to your system's capability. You can use the -verbose:sizes option to find out the values that the VM is currently using.

OSError - Errno 13 Permission denied

Probably you are facing problem when a download request is made by the maybe_download function call in base.py file.

There is a conflict in the permissions of the temporary files and I myself couldn't work out a way to change the permissions, but was able to work around the problem.

Do the following...

Download the four .gz files of the MNIST data set from the link ( http://yann.lecun.com/exdb/mnist/ )
Then make a folder names MNIST_data (or your choice in your working directory/ site packages folder in the tensorflow\examples folder).
Directly copy paste the files into the folder.
Copy the address of the folder (it probably will be ( C:\Python\Python35\Lib\site-packages\tensorflow\examples\tutorials\mnist\MNIST_data ))
Change the "\" to "/" as "\" is used for escape characters, to access the folder locations.
Lastly, if you are following the tutorials, your call function would be ( mnist = input_data.read_data_sets("MNIST_data/", one_hot=True) ) ; change the "MNIST_data/" parameter to your folder location. As in my case would be ( mnist = input_data.read_data_sets("C:/Python/Python35/Lib/site-packages/tensorflow/examples/tutorials/mnist/MNIST_data", one_hot=True) )

Then it's all done. Hope it works for you.

How to get Python requests to trust a self signed SSL certificate?

try:

r = requests.post(url, data=data, verify='/path/to/public_key.pem')

How can I create a progress bar in Excel VBA?

In the past, with VBA projects, I've used a label control with the background colored and adjust the size based on the progress. Some examples with similar approaches can be found in the following links:

Here is one that uses Excel's Autoshapes:

http://www.andypope.info/vba/pmeter.htm

How to use `@ts-ignore` for a block

You can't.

As a workaround you can use a // @ts-nocheck comment at the top of a file to disable type-checking for that file: https://devblogs.microsoft.com/typescript/announcing-typescript-3-7-beta/

So to disable checking for a block (function, class, etc.), you can move it into its own file, then use the comment/flag above. (This isn't as flexible as block-based disabling of course, but it's the best option available at the moment.)

Kotlin Android start new Activity

Details

Android Studio 3.1.4
Kotlin version: 1.2.60

Step 1. Application()

Get link to the context of you application

class MY_APPLICATION_NAME: Application() {

    companion object {
        private lateinit var instance: MY_APPLICATION_NAME
        fun getAppContext(): Context = instance.applicationContext
    }

    override fun onCreate() {
        instance = this
        super.onCreate()
    }

}

Step 2. Add Router object

object Router {
    inline fun <reified T: Activity> start() {
         val context =  MY_APPLICATION_NAME.getAppContext()
         val intent = Intent(context, T::class.java)
         context.startActivity(intent)
    }
}

Usage

// You can start activity from any class: form Application, from any activity, from any fragment and other  
Router.start<ANY_ACTIVITY_CLASS>()

How do you cache an image in Javascript

I have a similar answer for asynchronous preloading images via JS. Loading them dynamically is the same as loading them normally. they will cache.

as for caching, you can't control the browser but you can set it via server. if you need to load a really fresh resource on demand, you can use the cache buster technique to force load a fresh resource.

Download single files from GitHub

Or try this

const https = require('https');
const fs = require('fs');
const DOMAIN = 'raw.githubusercontent.com';

function writeFile(data, fileName) {
  fs.appendFile(fileName, data.toString(), err => {
    if (err) {
      console.log('error in writing file', err);
    }
  });
}

function EOF(data) {
  console.log('EOF');
}

function getFileName(pathToFile) {
  var result = pathToFile.split('/');
  var splitLength = result.length;
  return result[splitLength - 1];
}
function getFile(branchName, username, repoName, ...pathToFile) {
  pathToFile.forEach(item => {
    const path = `/${username}/${repoName}/${branchName}/${item}`;
    const URL = `${DOMAIN}${path}`;
    const options = {
      hostname: DOMAIN,
      path: path
    };
    var fileName = getFileName(item);

    https
      .get(options, function(res) {
        console.log(res.statusCode);
        /* if file not found */
        if (res.statusCode === 404) {
          console.log('FILE NOT FOUND');
        } else {
          /* if file found */
          res.on('data', data => writeFile(data, fileName));
          res.on('end', data => EOF(data));
        }
      })
      .on('error', function(res) {
        console.log('error in reading URL');
      });
  });
}
getFile('master', 'bansalAyush', 'InstagramClone', '.babelrc', 'README.md');

Random row selection in Pandas dataframe

With pandas version 0.16.1 and up, there is now a DataFrame.sample method built-in:

import pandas

df = pandas.DataFrame(pandas.np.random.random(100))

# Randomly sample 70% of your dataframe
df_percent = df.sample(frac=0.7)

# Randomly sample 7 elements from your dataframe
df_elements = df.sample(n=7)

For either approach above, you can get the rest of the rows by doing:

df_rest = df.loc[~df.index.isin(df_percent.index)]

Random "Element is no longer attached to the DOM" StaleElementReferenceException

I have been able to use a method like this with some success:

WebElement getStaleElemById(String id) {
    try {
        return driver.findElement(By.id(id));
    } catch (StaleElementReferenceException e) {
        System.out.println("Attempting to recover from StaleElementReferenceException ...");
        return getStaleElemById(id);
    }
}

Yes, it just keeps polling the element until it's no longer considered stale (fresh?). Doesn't really get to the root of the problem, but I've found that the WebDriver can be rather picky about throwing this exception -- sometimes I get it, and sometimes I don't. Or it could be that the DOM really is changing.

So I don't quite agree with the answer above that this necessarily indicates a poorly-written test. I've got it on fresh pages which I have not interacted with in any way. I think there is some flakiness in either how the DOM is represented, or in what WebDriver considers to be stale.

Can I use if (pointer) instead of if (pointer != NULL)?

The relevant use cases for null pointers are

Redirection to something like a deeper tree node, which may not exist or has not been linked yet. That's something you should always keep closely encapsulated in a dedicated class, so readability or conciseness isn't that much of an issue here.
Dynamic casts. Casting a base-class pointer to a particular derived-class one (something you should again try to avoid, but may at times find necessary) always succeeds, but results in a null pointer if the derived class doesn't match. One way to check this is
```
Derived* derived_ptr = dynamic_cast<Derived*>(base_ptr);
if(derived_ptr != nullptr) { ... }
```
(or, preferrably, auto derived_ptr = ...). Now, this is bad, because it leaves the (possibly invalid, i.e. null) derived pointer outside of the safety-guarding if block's scope. This isn't necessary, as C++ allows you to introduce boolean-convertable variables inside an if-condition:
```
if(auto derived_ptr = dynamic_cast<Derived*>(base_ptr)) { ... }
```
which is not only shorter and scope-safe, it's also much more clear in its intend: when you check for null in a separate if-condition, the reader wonders "ok, so derived_ptr must not be null here... well, why would it be null?" Whereas the one-line version says very plainly "if you can safely cast base_ptr to Derived*, then use it for...".

The same works just as well for any other possible-failure operation that returns a pointer, though IMO you should generally avoid this: it's better to use something like boost::optional as the "container" for results of possibly failing operations, rather than pointers.

So, if the main use case for null pointers should always be written in a variation of the implicit-cast-style, I'd say it's good for consistency reasons to always use this style, i.e. I'd advocate for if(ptr) over if(ptr!=nullptr).

I'm afraid I have to end with an advert: the if(auto bla = ...) syntax is actually just a slightly cumbersome approximation to the real solution to such problems: pattern matching. Why would you first force some action (like casting a pointer) and then consider that there might be a failure... I mean, it's ridiculous, isn't it? It's like, you have some foodstuff and want to make soup. You hand it to your assistant with the task to extract the juice, if it happens to be a soft vegetable. You don't first look it at it. When you have a potato, you still give it to your assistant but they slap it back in your face with a failure note. Ah, imperative programming!

Much better: consider right away all the cases you might encounter. Then act accordingly. Haskell:

makeSoupOf :: Foodstuff -> Liquid
makeSoupOf p@(Potato{..}) = mash (boil p) <> water
makeSoupOf vegetable
 | isSoft vegetable  = squeeze vegetable <> salt
makeSoupOf stuff  = boil (throwIn (water<>salt) stuff)

Haskell also has special tools for when there is really a serious possibility of failure (as well as for a whole bunch of other stuff): monads. But this isn't the place for explaining those.

^{⟨/advert⟩}

<button> vs. <input type="button" />. Which to use?

Here's a page describing the differences (basically you can put html into a <button></button>)
And another page describing why people avoid <button></button> (Hint: IE6)

Another IE problem when using <button />:

And while we're talking about IE, it's got a couple of bugs related to the width of buttons. It'll mysteriously add extra padding when you're trying to add styles, meaning you have to add a tiny hack to get things under control.

How to select only 1 row from oracle sql?

select name, price
  from (
    select name, price, 
    row_number() over (order by price) r
      from items
  )
where r between 1 and 5;

Is there a way to remove unused imports and declarations from Angular 2+?

If you're a heavy visual studio user, you can simply open your preference settings and add the following to your settings.json:

...
"editor.formatOnSave": true,
"editor.codeActionsOnSave": {
  "source.organizeImports": true
}
....

Hopefully this can be helpful!

Peak detection in a 2D array

Well, here's some simple and not terribly efficient code, but for this size of a data set it is fine.

import numpy as np
grid = np.array([[0,0,0,0,0,0,0,0,0,0,0,0,0,0],
              [0,0,0,0,0,0,0,0,0.4,0.4,0.4,0,0,0],
              [0,0,0,0,0.4,1.4,1.4,1.8,0.7,0,0,0,0,0],
              [0,0,0,0,0.4,1.4,4,5.4,2.2,0.4,0,0,0,0],
              [0,0,0.7,1.1,0.4,1.1,3.2,3.6,1.1,0,0,0,0,0],
              [0,0.4,2.9,3.6,1.1,0.4,0.7,0.7,0.4,0.4,0,0,0,0],
              [0,0.4,2.5,3.2,1.8,0.7,0.4,0.4,0.4,1.4,0.7,0,0,0],
              [0,0,0.7,3.6,5.8,2.9,1.4,2.2,1.4,1.8,1.1,0,0,0],
              [0,0,1.1,5,6.8,3.2,4,6.1,1.8,0.4,0.4,0,0,0],
              [0,0,0.4,1.1,1.8,1.8,4.3,3.2,0.7,0,0,0,0,0],
              [0,0,0,0,0,0.4,0.7,0.4,0,0,0,0,0,0]])

arr = []
for i in xrange(grid.shape[0] - 1):
    for j in xrange(grid.shape[1] - 1):
        tot = grid[i][j] + grid[i+1][j] + grid[i][j+1] + grid[i+1][j+1]
        arr.append([(i,j),tot])

best = []

arr.sort(key = lambda x: x[1])

for i in xrange(5):
    best.append(arr.pop())
    badpos = set([(best[-1][0][0]+x,best[-1][0][1]+y)
                  for x in [-1,0,1] for y in [-1,0,1] if x != 0 or y != 0])
    for j in xrange(len(arr)-1,-1,-1):
        if arr[j][0] in badpos:
            arr.pop(j)


for item in best:
    print grid[item[0][0]:item[0][0]+2,item[0][1]:item[0][1]+2]

I basically just make an array with the position of the upper-left and the sum of each 2x2 square and sort it by the sum. I then take the 2x2 square with the highest sum out of contention, put it in the best array, and remove all other 2x2 squares that used any part of this just removed 2x2 square.

It seems to work fine except with the last paw (the one with the smallest sum on the far right in your first picture), it turns out that there are two other eligible 2x2 squares with a larger sum (and they have an equal sum to each other). One of them is still selects one square from your 2x2 square, but the other is off to the left. Fortunately, by luck we see to be choosing more of the one that you would want, but this may require some other ideas to be used to get what you actually want all of the time.

transform object to array with lodash

If you want the key (id in this case) to be a preserved as a property of each array item you can do

const arr = _(obj) //wrap object so that you can chain lodash methods
            .mapValues((value, id)=>_.merge({}, value, {id})) //attach id to object
            .values() //get the values of the result
            .value() //unwrap array of objects

If using maven, usually you put log4j.properties under java or resources?

Just putting it in src/main/resources will bundle it inside the artifact. E.g. if your artifact is a JAR, you will have the log4j.properties file inside it, losing its initial point of making logging configurable.

I usually put it in src/main/resources, and set it to be output to target like so:

<build>
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <targetPath>${project.build.directory}</targetPath>
            <includes>
                <include>log4j.properties</include>
            </includes>
        </resource>
    </resources>
</build>

Additionally, in order for log4j to actually see it, you have to add the output directory to the class path. If your artifact is an executable JAR, you probably used the maven-assembly-plugin to create it. Inside that plugin, you can add the current folder of the JAR to the class path by adding a Class-Path manifest entry like so:

<plugin>
    <artifactId>maven-assembly-plugin</artifactId>
    <configuration>
        <archive>
            <manifest>
                <mainClass>com.your-package.Main</mainClass>
            </manifest>
            <manifestEntries>
                <Class-Path>.</Class-Path>
            </manifestEntries>
        </archive>
        <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
    </configuration>
    <executions>
        <execution>
            <id>make-assembly</id> <!-- this is used for inheritance merges -->
            <phase>package</phase> <!-- bind to the packaging phase -->
            <goals>
                <goal>single</goal>
            </goals>
        </execution>
    </executions>
</plugin>

Now the log4j.properties file will be right next to your JAR file, independently configurable.

To run your application directly from Eclipse, add the resources directory to your classpath in your run configuration: Run->Run Configurations...->Java Application->New select the Classpath tab, select Advanced and browse to your src/resources directory.

'sprintf': double precision in C

From your question it seems like you are using C99, as you have used %lf for double.

To achieve the desired output replace:

sprintf(aa, "%lf", a);

with

sprintf(aa, "%0.7f", a);

The general syntax "%A.B" means to use B digits after decimal point. The meaning of the A is more complicated, but can be read about here.

Using Notepad++ to validate XML against an XSD

In Notepad++ go to Plugins > Plugin manager > Show Plugin Manager then find Xml Tools plugin. Tick the box and click Install
Open XML document you want to validate and click Ctrl+Shift+Alt+M (Or use Menu if this is your preference Plugins > XML Tools > Validate Now).
Following dialog will open:
Click on .... Point to XSD file and I am pretty sure you'll be able to handle things from here.

Hope this saves you some time.

EDIT: Plugin manager was not included in some versions of Notepad++ because many users didn't like commercials that it used to show. If you want to keep an older version, however still want plugin manager, you can get it on github, and install it by extracting the archive and copying contents to plugins and updates folder.
In version 7.7.1 plugin manager is back under a different guise... Plugin Admin so now you can simply update notepad++ and have it back.

Error in contrasts when defining a linear model in R

It appears that at least one of your predictors ,x1, x2, or x3, has only one factor level and hence is a constant.

Have a look at

lapply(dataframe.df[c("x1", "x2", "x3")], unique)

to find the different values.

MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]

This one helped me. Try creating a new folder, if your MongoDB is installed in C:\Program Files the folder should be called db and in a folder data. C:\data\db

When you start the mongod there should be a log where the db 'isnt found'.

Converting between datetime and Pandas Timestamp objects

To answer the question of going from an existing python datetime to a pandas Timestamp do the following:

    import time, calendar, pandas as pd
    from datetime import datetime
    
    def to_posix_ts(d: datetime, utc:bool=True) -> float:
        tt=d.timetuple()
        return (calendar.timegm(tt) if utc else time.mktime(tt)) + round(d.microsecond/1000000, 0)
    
    def pd_timestamp_from_datetime(d: datetime) -> pd.Timestamp:
        return pd.to_datetime(to_posix_ts(d), unit='s')
    
    dt = pd_timestamp_from_datetime(datetime.now())
    print('({}) {}'.format(type(dt), dt))

Output:

(<class 'pandas._libs.tslibs.timestamps.Timestamp'>) 2020-09-05 23:38:55

I was hoping for a more elegant way to do this but the to_posix_ts is already in my standard tool chain so I'm moving on.

Toggle Class in React

Toggle function in react

At first you should create constructor like this

constructor(props) {
        super(props);
        this.state = {
            close: true,
        };
    }

Then create a function like this

yourFunction = () => {
        this.setState({
            close: !this.state.close,
        });
    };

then use this like

render() {
        const {close} = this.state;
        return (

            <Fragment>

                 <div onClick={() => this.yourFunction()}></div>

                 <div className={close ? "isYourDefaultClass" : "isYourOnChangeClass"}></div>

            </Fragment>
        )
    }
}

Please give better solutions

Getting path of captured image in Android using camera intent

Try this method to get path of original image captured by camera.

public String getOriginalImagePath() {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = getActivity().managedQuery(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                projection, null, null, null);
        int column_index_data = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToLast();

        return cursor.getString(column_index_data);
    }

This method will return path of the last image captured by camera. So this path would be of original image not of thumbnail bitmap.

How to find the logs on android studio?

Had a hard time finding the logs because the IDE was crashing on launch, if you are on Mac and use Android Studio 4.1 then the logs location may be found at /Users/{user}/Library/Logs/Google/AndroidStudio4.1/

And to be specific for me it is on macOS Big Sur

JSON: why are forward slashes escaped?

PHP escapes forward slashes by default which is probably why this appears so commonly. I'm not sure why, but possibly because embedding the string "</script>" inside a <script> tag is considered unsafe.

This functionality can be disabled by passing in the JSON_UNESCAPED_SLASHES flag but most developers will not use this since the original result is already valid JSON.

AngularJS ng-click to go to another page (with Ionic framework)

If you simply want to go to another page, then what you might need is a link that looks like a button with a href like so:

<a href="/#/somepage.html" class="button">Back to Listings</a>

Hope this helps.

What is the maximum possible length of a query string?

Different web stacks do support different lengths of http-requests. I know from experience that the early stacks of Safari only supported 4000 characters and thus had difficulty handling ASP.net pages because of the USER-STATE. This is even for POST, so you would have to check the browser and see what the stack limit is. I think that you may reach a limit even on newer browsers. I cannot remember but one of them (IE6, I think) had a limit of 16-bit limit, 32,768 or something.

.bashrc at ssh login

.bashrc is not sourced when you log in using SSH. You need to source it in your .bash_profile like this:

if [ -f ~/.bashrc ]; then
  . ~/.bashrc
fi

SQL Server loop - how do I loop through a set of records

Small change to sam yi's answer (for better readability):

select top 1000 TableID
into #ControlTable 
from dbo.table
where StatusID = 7

declare @TableID int

while exists (select * from #ControlTable)
begin

    select @TableID = (select top 1 TableID
                       from #ControlTable
                       order by TableID asc)

    -- Do something with your TableID

    delete #ControlTable
    where TableID = @TableID

end

drop table #ControlTable

How can I insert into a BLOB column from an insert statement in sqldeveloper?

To insert a VARCHAR2 into a BLOB column you can rely on the function utl_raw.cast_to_raw as next:

insert into mytable(id, myblob) values (1, utl_raw.cast_to_raw('some magic here'));

It will cast your input VARCHAR2 into RAW datatype without modifying its content, then it will insert the result into your BLOB column.

More details about the function utl_raw.cast_to_raw

Why should hash functions use a prime number modulus?

I would say the first answer at this link is the clearest answer I found regarding this question.

Consider the set of keys K = {0,1,...,100} and a hash table where the number of buckets is m = 12. Since 3 is a factor of 12, the keys that are multiples of 3 will be hashed to buckets that are multiples of 3:

Keys {0,12,24,36,...} will be hashed to bucket 0.
Keys {3,15,27,39,...} will be hashed to bucket 3.
Keys {6,18,30,42,...} will be hashed to bucket 6.
Keys {9,21,33,45,...} will be hashed to bucket 9.

If K is uniformly distributed (i.e., every key in K is equally likely to occur), then the choice of m is not so critical. But, what happens if K is not uniformly distributed? Imagine that the keys that are most likely to occur are the multiples of 3. In this case, all of the buckets that are not multiples of 3 will be empty with high probability (which is really bad in terms of hash table performance).

This situation is more common that it may seem. Imagine, for instance, that you are keeping track of objects based on where they are stored in memory. If your computer's word size is four bytes, then you will be hashing keys that are multiples of 4. Needless to say that choosing m to be a multiple of 4 would be a terrible choice: you would have 3m/4 buckets completely empty, and all of your keys colliding in the remaining m/4 buckets.

In general:

Every key in K that shares a common factor with the number of buckets m will be hashed to a bucket that is a multiple of this factor.

Therefore, to minimize collisions, it is important to reduce the number of common factors between m and the elements of K. How can this be achieved? By choosing m to be a number that has very few factors: a prime number.

FROM THE ANSWER BY Mario.

Understanding the basics of Git and GitHub

What is the difference between Git and GitHub?

Git is a distributed version control system. It usually runs at the command line of your local machine. It keeps track of your files and modifications to those files in a "repository" (or "repo"), but only when you tell it to do so. (In other words, you decide which files to track and when to take a "snapshot" of any modifications.)

In contrast, GitHub is a website that allows you to publish your Git repositories online, which can be useful for many reasons (see #3).
Is Git saving every repository locally (in the user's machine) and in GitHub?

Git is known as a "distributed" (rather than "centralized") version control system because you can run it locally and disconnected from the Internet, and then "push" your changes to a remote system (such as GitHub) whenever you like. Thus, repo changes only appear on GitHub when you manually tell Git to push those changes.
Can you use Git without GitHub? If yes, what would be the benefit for using GitHub?

Yes, you can use Git without GitHub. Git is the "workhorse" program that actually tracks your changes, whereas GitHub is simply hosting your repositories (and provides additional functionality not available in Git). Here are some of the benefits of using GitHub:
- It provides a backup of your files.
- It gives you a visual interface for navigating your repos.
- It gives other people a way to navigate your repos.
- It makes repo collaboration easy (e.g., multiple people contributing to the same project).
- It provides a lightweight issue tracking system.
How does Git compare to a backup system such as Time Machine?

Git does backup your files, though it gives you much more granular control than a traditional backup system over what and when you backup. Specifically, you "commit" every time you want to take a snapshot of changes, and that commit includes both a description of your changes and the line-by-line details of those changes. This is optimal for source code because you can easily see the change history for any given file at a line-by-line level.
Is this a manual process, in other words if you don't commit you won't have a new version of the changes made?

Yes, this is a manual process.
If are not collaborating and you are already using a backup system why would you use Git?
- Git employs a powerful branching system that allows you to work on multiple, independent lines of development simultaneously and then merge those branches together as needed.
- Git allows you to view the line-by-line differences between different versions of your files, which makes troubleshooting easier.
- Git forces you to describe each of your commits, which makes it significantly easier to track down a specific previous version of a given file (and potentially revert to that previous version).
- If you ever need help with your code, having it tracked by Git and hosted on GitHub makes it much easier for someone else to look at your code.

For getting started with Git, I recommend the online book Pro Git as well as GitRef as a handy reference guide. For getting started with GitHub, I like the GitHub's Bootcamp and their GitHub Guides. Finally, I created a short videos series to introduce Git and GitHub to beginners.

Escape double quotes for JSON in Python

You should be using the json module. json.dumps(string). It can also serialize other python data types.

import json

>>> s = 'my string with "double quotes" blablabla'

>>> json.dumps(s)
<<< '"my string with \\"double quotes\\" blablabla"'

Add Custom Headers using HttpWebRequest

A simple method of creating the service, adding headers and reading the JSON response,

private static void WebRequest()
{
    const string WEBSERVICE_URL = "<<Web Service URL>>";
    try
    {
        var webRequest = System.Net.WebRequest.Create(WEBSERVICE_URL);
        if (webRequest != null)
        {
            webRequest.Method = "GET";
            webRequest.Timeout = 20000;
            webRequest.ContentType = "application/json";
            webRequest.Headers.Add("Authorization", "Basic dcmGV25hZFzc3VudDM6cGzdCdvQ=");
            using (System.IO.Stream s = webRequest.GetResponse().GetResponseStream())
            {
                using (System.IO.StreamReader sr = new System.IO.StreamReader(s))
                {
                    var jsonResponse = sr.ReadToEnd();
                    Console.WriteLine(String.Format("Response: {0}", jsonResponse));
                }
            }
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.ToString());
    }
}

Convert UTC date time to local date time

You can use momentjs ,moment(date).format() will always give result in local date.

Bonus , you can format in any way you want. For eg.

moment().format('MMMM Do YYYY, h:mm:ss a'); // September 14th 2018, 12:51:03 pm
moment().format('dddd');                    // Friday
moment().format("MMM Do YY");

For more details you can refer Moment js website

C# Collection was modified; enumeration operation may not execute

The error tells you EXACTLY what the problem is (and running in the debugger or reading the stack trace will tell you exactly where the problem is):

C# Collection was modified; enumeration operation may not execute.

Your problem is the loop

foreach (KeyValuePair<int, int> kvp in rankings) {
    //
}

wherein you modify the collection rankings. In particular, the offensive line is

rankings[kvp.Key] = rankings[kvp.Key] + 4;

Before you enter the loop, add the following line:

var listOfRankingsToModify = new List<int>();

Replace the offending line with

listOfRankingsToModify.Add(kvp.Key);

and after you exit the loop

foreach(var key in listOfRankingsToModify) {
    rankings[key] = rankings[key] + 4;
}

That is, record what changes you need to make, and make them without iterating over the collection that you need to modify.

SyntaxError: cannot assign to operator

Well, as the error says, you have an expression (((t[1])/length) * t[1]) on the left side of the assignment, rather than a variable name. You have that expression, and then you tell Python to add string to it (which is always "") and assign it to... where? ((t[1])/length) * t[1] isn't a variable name, so you can't store the result into it.

Did you mean string += ((t[1])/length) * t[1]? That would make more sense. Of course, you're still trying to add a number to a string, or multiply by a string... one of those t[1]s should probably be a t[0].

Convert xlsx file to csv using batch

Needs installed excel as it uses the Excel.Application com object.Save this as .bat file:

@if (@X)==(@Y) @end /* JScript comment
    @echo off


    cscript //E:JScript //nologo "%~f0" %*

    exit /b %errorlevel%

@if (@X)==(@Y) @end JScript comment */


var ARGS = WScript.Arguments;

var xlCSV = 6;

var objExcel = WScript.CreateObject("Excel.Application");
var objWorkbook = objExcel.Workbooks.Open(ARGS.Item(0));
objExcel.DisplayAlerts = false;
objExcel.Visible = false;

var objWorksheet = objWorkbook.Worksheets(ARGS.Item(1))
objWorksheet.SaveAs( ARGS.Item(2), xlCSV);

objExcel.Quit();

It accepts three arguments - the absolute path to the xlsx file, the sheet name and the absolute path to the target csv file:

call toCsv.bat "%cd%\Book1.xlsx" Sheet1 "%cd%\csv.csv"

How to split a string in Ruby and get all items except the first one?

ex.split(',', 2).last

The 2 at the end says: split into 2 pieces, not more.

normally split will cut the value into as many pieces as it can, using a second value you can limit how many pieces you will get. Using ex.split(',', 2) will give you:

["test1", "test2, test3, test4, test5"]

as an array, instead of:

["test1", "test2", "test3", "test4", "test5"]

Celery Received unregistered task of type (run example)

I've found that one of our programmers added the following line to one of the imports:

os.chdir(<path_to_a_local_folder>)

This caused the Celery worker to change its working directory from the projects' default working directory (where it could find the tasks) to a different directory (where it couldn't find the tasks).

After removing this line of code, all tasks were found and registered.

How to display image with JavaScript?

You could make use of the Javascript DOM API. In particular, look at the createElement() method.

You could create a re-usable function that will create an image like so...

function show_image(src, width, height, alt) {
    var img = document.createElement("img");
    img.src = src;
    img.width = width;
    img.height = height;
    img.alt = alt;

    // This next line will just add it to the <body> tag
    document.body.appendChild(img);
}

Then you could use it like this...

<button onclick=
    "show_image('http://google.com/images/logo.gif', 
                 276, 
                 110, 
                 'Google Logo');">Add Google Logo</button>

See a working example on jsFiddle: http://jsfiddle.net/Bc6Et/

How do I resolve "Cannot find module" error using Node.js?

Just found an unusual scenario that may be of use to someone and is sort of a red herring.

I was also getting the Cannot Find Module error but oddly everything worked perfectly in my local (Mac hosted) Node.js environment. This problem only appeared when the code was deployed on our Linux server.

Well... it turned out to be a typo that (apparently) the Mac based Node.js installation was perfectly happy to ignore.

The include looked like this:

var S3Uploader = require('./S3Uploader.class');

But the actual file was called "s3Uploader.class.js"

Notice the casing difference in the 's' vs. 'S' between the code and the filename.

So - in the odd chance that none of the other solutions here are solving your problem, triple check that you're not mis-casing the characters in your included filename! :)

and DUH!

What is the exact meaning of Git Bash?

I think the question asker is (was) thinking that git bash is a command like git init or git checkout. Git bash is not a command, it is an interface. I will also assume the asker is not a linux user because bash is very popular the unix/linux world. The name "bash" is an acronym for "Bourne Again SHell". Bash is a text-only command interface that has features which allow automated scripts to be run. A good analogy would be to compare bash to the new PowerShell interface in Windows7/8. A poor analogy (but one likely to be more readily understood by more people) is the combination of the command prompt and .BAT (batch) command files from the days of DOS and early versions of Windows.

REFERENCES:

Remove Duplicate objects from JSON Array

_x000D_

var standardsList = [_x000D_
    {"Grade": "Math K", "Domain": "Counting & Cardinality"},_x000D_
    {"Grade": "Math K", "Domain": "Counting & Cardinality"},_x000D_
    {"Grade": "Math K", "Domain": "Counting & Cardinality"},_x000D_
    {"Grade": "Math K", "Domain": "Counting & Cardinality"},_x000D_
    {"Grade": "Math K", "Domain": "Geometry"},_x000D_
    {"Grade": "Math 1", "Domain": "Counting & Cardinality"},_x000D_
    {"Grade": "Math 1", "Domain": "Counting & Cardinality"},_x000D_
    {"Grade": "Math 1", "Domain": "Orders of Operation"},_x000D_
    {"Grade": "Math 2", "Domain": "Geometry"},_x000D_
    {"Grade": "Math 2", "Domain": "Geometry"}_x000D_
];_x000D_
_x000D_
standardsList = standardsList.filter((li, idx, self) => self.map(itm => itm.Grade+itm.Domain).indexOf(li.Grade+li.Domain) === idx)_x000D_
_x000D_
document.write(JSON.stringify(standardsList))

_x000D_

here is a functional way of doing it that is much easier

standardsList = standardsList.filter((li, idx, self) => self.map(itm => iem.Grade+itm.domain).indexOf(li.Grade+li.domain) === idx)

Merging two arrays in .NET

int [] SouceArray1 = new int[] {2,1,3};
int [] SourceArray2 = new int[] {4,5,6};
int [] targetArray = new int [SouceArray1.Length + SourceArray2.Length];
SouceArray1.CopyTo(targetArray,0);
SourceArray2.CopyTo(targetArray,SouceArray1.Length) ; 
foreach (int i in targetArray) Console.WriteLine(i + " ");

Using the above code two Arrays can be easily merged.

What dependency is missing for org.springframework.web.bind.annotation.RequestMapping?

Add this below dependency in your pom.xml

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
</dependency>

This is used for @RestController, @RequestMapping

Cause of No suitable driver found for

It might be that

hsql://localhost

can't be resolved to a file. Look at the sample program here:

Sample HSQLDB program

See if you can get that working first, and then see if you can take that configuration information and use it in the Spring bean configuration.

Good luck!

Android API 21 Toolbar Padding

A combination of

android:padding="0dp" In the xml for the Toolbar

and

mToolbar.setContentInsetsAbsolute(0, 0) In the code

This worked for me.

jQuery find events handlers registered with an object

As of jQuery 1.8, the event data is no longer available from the "public API" for data. Read this jQuery blog post. You should now use this instead:

jQuery._data( elem, "events" );

elem should be an HTML Element, not a jQuery object, or selector.

Please note, that this is an internal, 'private' structure, and shouldn't be modified. Use this for debugging purposes only.

In older versions of jQuery, you might have to use the old method which is:

jQuery( elem ).data( "events" );

Virtual network interface in Mac OS X

The loopback adapter is always up.

ifconfig lo0 alias 172.16.123.1 will add an alias IP 172.16.123.1 to the loopback adapter

ifconfig lo0 -alias 172.16.123.1 will remove it

Ignore cells on Excel line graph

In the value or values you want to separate, enter the =NA() formula. This will appear that the value is skipped but the preceding and following data points will be joined by the series line.
Enter the data you want to skip in the same location as the original (row or column) but add it as a new series. Add the new series to your chart.
Format the new data point to match the original series format (color, shape, etc.). It will appear as though the data point was just skipped in the original series but will still show on your chart if you want to label it or add a callout.

Django Forms: if not valid, show form with error message

UPDATE: Added a more detailed description of the formset errors.

Form.errors combines all field and non_field_errors. Therefore you can simplify the html to this:

template

    {% load form_tags %}

    {% if form.errors %}
    <div class="alert alert-danger alert-dismissible col-12 mx-1" role="alert">
        <div id="form_errors">
            {% for key, value in form.errors.items %}
                <span class="fieldWrapper">
                    {{ key }}:{{ value }}
                </span>
            {% endfor %}
        </div>
        <button type="button" class="close" data-dismiss="alert" aria-label="Close">
            <span aria-hidden="true">&times;</span>
        </button>
    </div>
    {% endif %}


If you want to generalise it you can create a list_errors.html which you include in every form template. It handles form and formset errors:

    {% if form.errors %}
    <div class="alert alert-danger alert-dismissible col-12 mx-1" role="alert">
        <div id="form_errors">

            {% for key, value in form.errors.items %}
                <span class="fieldWrapper">
                    {{ key }}:{{ value }}
                </span>
            {% endfor %}
        </div>
        <button type="button" class="close" data-dismiss="alert" aria-label="Close">
            <span aria-hidden="true">&times;</span>
        </button>
    </div>
    {% elif formset.total_error_count %}
    <div class="alert alert-danger alert-dismissible col-12 mx-1" role="alert">
        <div id="form_errors">
            {% if formset.non_form_errors %}
                {{ formset.non_form_errors }}
            {% endif %}
            {% for form in formset.forms %}
                {% if form.errors %}
                    Form number {{ forloop.counter }}:
                    <ul class="errorlist">
                    {% for key, error in form.errors.items %}
                        <li>{{form.fields|get_label:key}}
                            <ul class="errorlist">
                                <li>{{error}}</li>
                            </ul>
                        </li>
                    {% endfor %}
                    </ul>
                {% endif %}
            {% endfor %}

        </div>
    </div>

    {% endif %}

form_tags.py

from django import template

register = template.Library()


def get_label(a_dict, key):
    return getattr(a_dict.get(key), 'label', 'No label')


register.filter("get_label", get_label)

One caveat: In contrast to forms Formset.errors does not include non_field_errors.

SQL Update with row_number()

DECLARE @id INT 
SET @id = 0 
UPDATE DESTINATAIRE_TEMP
SET @id = CODE_DEST = @id + 1 
GO

try this

http://www.mssqltips.com/sqlservertip/1467/populate-a-sql-server-column-with-a-sequential-number-not-using-an-identity/

How can I count text lines inside an DOM element? Can I?

For those who use jQuery http://jsfiddle.net/EppA2/3/

function getRows(selector) {
    var height = $(selector).height();
    var line_height = $(selector).css('line-height');
    line_height = parseFloat(line_height)
    var rows = height / line_height;
    return Math.round(rows);
}

@import vs #import - iOS 7

It currently only works for the built in system frameworks. If you use #import like apple still do importing the UIKit framework in the app delegate it is replaced (if modules is on and its recognised as a system framework) and the compiler will remap it to be a module import and not an import of the header files anyway. So leaving the #import will be just the same as its converted to a module import where possible anyway

Efficient way to add spaces between characters in a string

s = "BINGO"
print(s.replace("", " ")[1: -1])

Timings below

$ python -m timeit -s's = "BINGO"' 's.replace(""," ")[1:-1]'
1000000 loops, best of 3: 0.584 usec per loop
$ python -m timeit -s's = "BINGO"' '" ".join(s)'
100000 loops, best of 3: 1.54 usec per loop

How to push both key and value into an Array in Jquery

There are no keys in JavaScript arrays. Use objects for that purpose.

var obj = {};

$.getJSON("displayjson.php",function (data) {
    $.each(data.news, function (i, news) {
        obj[news.title] = news.link;
    });                      
});

// later:
$.each(obj, function (index, value) {
    alert( index + ' : ' + value );
});

In JavaScript, objects fulfill the role of associative arrays. Be aware that objects do not have a defined "sort order" when iterating them (see below).

However, In your case it is not really clear to me why you transfer data from the original object (data.news) at all. Why do you not simply pass a reference to that object around?

You can combine objects and arrays to achieve predictable iteration and key/value behavior:

var arr = [];

$.getJSON("displayjson.php",function (data) {
    $.each(data.news, function (i, news) {
        arr.push({
            title: news.title, 
            link:  news.link
        });
    });                      
});

// later:
$.each(arr, function (index, value) {
    alert( value.title + ' : ' + value.link );
});

Javascript: Extend a Function

This is very simple and straight forward. Look at the code. Try to grasp the basic concept behind javascript extension.

First let us extend javascript function.

function Base(props) {
    const _props = props
    this.getProps = () => _props

    // We can make method private by not binding it to this object. 
    // Hence it is not exposed when we return this.
    const privateMethod = () => "do internal stuff" 

    return this
}

You can extend this function by creating child function in following way

function Child(props) {
    const parent = Base(props)
    this.getMessage = () => `Message is ${parent.getProps()}`;

    // You can remove the line below to extend as in private inheritance, 
    // not exposing parent function properties and method.
    this.prototype = parent
    return this
}

Now you can use Child function as follows,

let childObject = Child("Secret Message")
console.log(childObject.getMessage())     // logs "Message is Secret Message"
console.log(childObject.getProps())       // logs "Secret Message"

We can also create Javascript Function by extending Javascript classes, like this.

class BaseClass {
    constructor(props) {
        this.props = props
        // You can remove the line below to make getProps method private. 
        // As it will not be binded to this, but let it be
        this.getProps = this.getProps.bind(this)
    }

    getProps() {
        return this.props
    }
}

Let us extend this class with Child function like this,

function Child(props) {
    let parent = new BaseClass(props)
    const getMessage = () => `Message is ${parent.getProps()}`;
    return { ...parent, getMessage} // I have used spread operator. 
}

Again you can use Child function as follows to get similar result,

let childObject = Child("Secret Message")
console.log(childObject.getMessage())     // logs "Message is Secret Message"
console.log(childObject.getProps())       // logs "Secret Message"

Javascript is very easy language. We can do almost anything. Happy JavaScripting... Hope I was able to give you an idea to use in your case.

How can I change image source on click with jQuery?

 $('div#imageContainer').click(function () {
      $('div#imageContainerimg').attr('src', 'YOUR NEW IMAGE URL HERE'); 
});

NoClassDefFoundError - Eclipse and Android

I had this problem after updating ADT.

I was storing all of my JAR files in a folder called "lib" and adding the jars to the build path the normal Eclipse way. This worked fine until my update.

After my update, I was getting the NoClassDefFoundError for a class that I could clearly see was included in the jar (checking out the ReferencedLibraries classes).

The solution was to remove my jars from the build path and rename my "lib" folder to "libs". This is an ant convention, and seems to be the way the new ADT finds and includes libraries in an .apk file. Once I did this, everything worked fine.

What is HTTP "Host" header?

I would always recommend going to the authoritative source when trying to understand the meaning and purpose of HTTP headers.

The "Host" header field in a request provides the host and port
information from the target URI, enabling the origin server to
distinguish among resources while servicing requests for multiple
host names on a single IP address.

https://tools.ietf.org/html/rfc7230#section-5.4

How to filter WooCommerce products by custom attribute

On one of my sites I had to make a custom search by a lot of data some of it from custom fields here is how my $args look like for one of the options:

$args = array(
    'meta_query' => $meta_query,
    'tax_query' => array(
        $query_tax
    ),
    'posts_per_page' => 10,
    'post_type' => 'ad_listing',
    'orderby' => $orderby,
    'order' => $order,
    'paged' => $paged
);

where "$meta_query" is:

$key = "your_custom_key"; //custom_color for example
$value = "blue";//or red or any color
$query_color = array('key' => $key, 'value' => $value);
$meta_query[] = $query_color;

and after that:

query_posts($args);

so you would probably get more info here: http://codex.wordpress.org/Class_Reference/WP_Query and you can search for "meta_query" in the page to get to the info

How do I get the current username in .NET using C#?

I went over most of the answers here and none of them gave me the right user name.

In my case I wanted to get the logged in user name, while running my app from a different user, like when shift+right click on a file and "Run as a different user".

The answers I tried gave me the 'other' username.

This blog post supplies a way to get the logged in user name, which works even in my scenario:
https://smbadiwe.github.io/post/track-activities-windows-service/

It uses Wtsapi

"query function not defined for Select2 undefined error"

I have a complicated Web App and I couldn't figure out exactly why this error was being thrown. It was causing the JavaScript to abort when thrown.

In select2.js I changed:

        if (typeof(opts.query) !== "function") {
            throw "query function not defined for Select2 " + opts.element.attr("id");
        }

to:

        if (typeof(opts.query) !== "function") {
            console.error("query function not defined for Select2 " + opts.element.attr("id"));
        }

Now everything seems to work properly but it is still logging in error in case I want to try and figure out what exactly in my code is causing the error. But for now this is a good enough fix for me.

javascript check for not null

You should be using the strict not equals comparison operator !== so that if the user inputs "null" then you won't get to the else.

Mosaic Grid gallery with dynamic sized images

I think you can try "Google Grid Gallery", it based on aforementioned Masonry with some additions, like styles and viewer.

How to add action listener that listens to multiple buttons

There is no this pointer in a static method. (I don't believe this code will even compile.)

You shouldn't be doing these things in a static method like main(); set things up in a constructor. I didn't compile or run this to see if it actually works, but give it a try.

public class Calc extends JFrame implements ActionListener {

    private Button button1;

    public Calc()
    {
        super();
        this.setSize(100, 100);
        this.setVisible(true);

        this.button1 = new JButton("1");
        this.button1.addActionListener(this);
        this.add(button1);
    }


    public static void main(String[] args) {

        Calc calc = new Calc();
        calc.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == button1)
    }  

}

How do I get the path of the Python script I am running in?

7.2 of Dive Into Python: Finding the Path.

import sys, os

print('sys.argv[0] =', sys.argv[0])             
pathname = os.path.dirname(sys.argv[0])        
print('path =', pathname)
print('full path =', os.path.abspath(pathname))

Android webview launches browser when calling loadurl

I was facing the same problem and I found the solution Android's official Documentation about WebView

Here is my onCreateView() method and here i used two methods to open the urls

Method 1 is opening url in Browser and

Method 2 is opening url in your desired WebView.
And I am using Method 2 for my Application and this is my code:

public class MainActivity extends Activity {
   private WebView myWebView;

     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

      View rootView = inflater.inflate(R.layout.fragment_webpage_detail, container, false);

      // Show the dummy content as text in a TextView.
      if (mItem != null) {

         /* Method : 1
          This following line is working fine BUT when we click the menu item then it opens the URL in BROWSER not in WebView */
         //((WebView)   rootView.findViewById(R.id.detail_area)).loadUrl(mItem.url);

        // Method : 2
        myWebView = (WebView) rootView.findViewById(R.id.detail_area); // get your WebView form your xml file
        myWebView.setWebViewClient(new WebViewClient()); // set the WebViewClient
        myWebView.loadUrl(mItem.url); // Load your desired url
    }

    return rootView;
}                                                                                               }

C# Linq Group By on multiple columns

Given a list:

var list = new List<Child>()
{
    new Child()
        {School = "School1", FavoriteColor = "blue", Friend = "Bob", Name = "John"},
    new Child()
        {School = "School2", FavoriteColor = "blue", Friend = "Bob", Name = "Pete"},
    new Child()
        {School = "School1", FavoriteColor = "blue", Friend = "Bob", Name = "Fred"},
    new Child()
        {School = "School2", FavoriteColor = "blue", Friend = "Fred", Name = "Bob"},
};

The query would look like:

var newList = list
    .GroupBy(x => new {x.School, x.Friend, x.FavoriteColor})
    .Select(y => new ConsolidatedChild()
        {
            FavoriteColor = y.Key.FavoriteColor,
            Friend = y.Key.Friend,
            School = y.Key.School,
            Children = y.ToList()
        }
    );

Test code:

foreach(var item in newList)
{
    Console.WriteLine("School: {0} FavouriteColor: {1} Friend: {2}", item.School,item.FavoriteColor,item.Friend);
    foreach(var child in item.Children)
    {
        Console.WriteLine("\t Name: {0}", child.Name);
    }
}

Result:

School: School1 FavouriteColor: blue Friend: Bob
    Name: John
    Name: Fred
School: School2 FavouriteColor: blue Friend: Bob
    Name: Pete
School: School2 FavouriteColor: blue Friend: Fred
    Name: Bob

Timeout function if it takes too long to finish

I rewrote David's answer using the with statement, it allows you do do this:

with timeout(seconds=3):
    time.sleep(4)

Which will raise a TimeoutError.

The code is still using signal and thus UNIX only:

import signal

class timeout:
    def __init__(self, seconds=1, error_message='Timeout'):
        self.seconds = seconds
        self.error_message = error_message
    def handle_timeout(self, signum, frame):
        raise TimeoutError(self.error_message)
    def __enter__(self):
        signal.signal(signal.SIGALRM, self.handle_timeout)
        signal.alarm(self.seconds)
    def __exit__(self, type, value, traceback):
        signal.alarm(0)

Upgrade python without breaking yum

vim `which yum`
modify #/usr/bin/python to #/usr/bin/python2.4

How to map atan2() to degrees 0-360

This is what I normally do:

float rads = atan2(y, x);
if (y < 0) rads = M_PI*2.f + rads;
float degrees = rads*180.f/M_PI;

Convert pandas dataframe to NumPy array

It seems like df.to_records() will work for you. The exact feature you're looking for was requested and to_records pointed to as an alternative.

I tried this out locally using your example, and that call yields something very similar to the output you were looking for:

rec.array([(1, nan, 0.2, nan), (2, nan, nan, 0.5), (3, nan, 0.2, 0.5),
       (4, 0.1, 0.2, nan), (5, 0.1, 0.2, 0.5), (6, 0.1, nan, 0.5),
       (7, 0.1, nan, nan)],
      dtype=[(u'ID', '<i8'), (u'A', '<f8'), (u'B', '<f8'), (u'C', '<f8')])

Note that this is a recarray rather than an array. You could move the result in to regular numpy array by calling its constructor as np.array(df.to_records()).

Python: How to create a unique file name?

This can be done using the unique function in ufp.path module.

import ufp.path
ufp.path.unique('./test.ext')

if current path exists 'test.ext' file. ufp.path.unique function return './test (d1).ext'.

Finding index of character in Swift String

Swift 5

Find index of substring

let str = "abcdecd"
if let range: Range<String.Index> = str.range(of: "cd") {
    let index: Int = str.distance(from: str.startIndex, to: range.lowerBound)
    print("index: ", index) //index: 2
}
else {
    print("substring not found")
}

Find index of Character

let str = "abcdecd"
if let firstIndex = str.firstIndex(of: "c") {
    let index: Int = str.distance(from: str.startIndex, to: firstIndex)
    print("index: ", index)   //index: 2
}
else {
    print("symbol not found")
}

Map implementation with duplicate keys

class  DuplicateMap<K, V> 
{
    enum MapType
    {
        Hash,LinkedHash
    }

    int HashCode = 0;
    Map<Key<K>,V> map = null;

    DuplicateMap()
    {
        map = new HashMap<Key<K>,V>();
    }

    DuplicateMap( MapType maptype )
    {
        if ( maptype == MapType.Hash ) {
            map = new HashMap<Key<K>,V>();
        }
        else if ( maptype == MapType.LinkedHash ) {
            map = new LinkedHashMap<Key<K>,V>();
        }
        else
            map = new HashMap<Key<K>,V>();
    }

    V put( K key, V value  )
    {

        return map.put( new Key<K>( key , HashCode++ ), value );
    }

    void putAll( Map<K, V> map1 )
    {
        Map<Key<K>,V> map2 = new LinkedHashMap<Key<K>,V>();

        for ( Entry<K, V> entry : map1.entrySet() ) {
            map2.put( new Key<K>( entry.getKey() , HashCode++ ), entry.getValue());
        }
        map.putAll(map2);
    }

    Set<Entry<K, V>> entrySet()
    {
        Set<Entry<K, V>> entry = new LinkedHashSet<Map.Entry<K,V>>();
        for ( final Entry<Key<K>, V> entry1 : map.entrySet() ) {
            entry.add( new Entry<K, V>(){
                private K Key = entry1.getKey().Key();
                private V Value = entry1.getValue();

                @Override
                public K getKey() {
                    return Key;
                }

                @Override
                public V getValue() {
                    return Value;
                }

                @Override
                public V setValue(V value) {
                    return null;
                }});
        }

        return entry;
    }

    @Override
    public String toString() {
        StringBuilder builder = new  StringBuilder();
        builder.append("{");
        boolean FirstIteration = true;
        for ( Entry<K, V> entry : entrySet() ) {
            builder.append( ( (FirstIteration)? "" : "," ) + ((entry.getKey()==null) ? null :entry.getKey().toString() ) + "=" + ((entry.getValue()==null) ? null :entry.getValue().toString() )  );
            FirstIteration = false;
        }
        builder.append("}");
        return builder.toString();
    }

    class Key<K1>
    {
        K1 Key;
        int HashCode;

        public Key(K1 key, int hashCode) {
            super();
            Key = key;
            HashCode = hashCode;
        }

        public K1 Key() {
            return Key;
        }

        @Override
        public String toString() {
            return  Key.toString() ;
        }

        @Override
        public int hashCode() {

            return HashCode;
        }
    }

Convert utf8-characters to iso-88591 and back in PHP

I used:

function utf8_to_html ($data) {
    return preg_replace(
        array (
            '/ä/',
            '/ö/',
            '/ü/',
            '/é/',
            '/à/',
            '/è/'
        ),
        array (
            '&auml;',
            '&ouml;',
            '&uuml;',
            '&eacute;',
            '&agrave;',
            '&egrave;'
        ),
        $data 
    );
}

Remove duplicated rows using dplyr

When selecting columns in R for a reduced data-set you can often end up with duplicates.

These two lines give the same result. Each outputs a unique data-set with two selected columns only:

distinct(mtcars, cyl, hp);

summarise(group_by(mtcars, cyl, hp));

how to set default method argument values?

If your arguments are the same type you could use varargs:

public int something(int... args) {
    int a = 0;
    int b = 0;
    if (args.length > 0) {
      a = args[0];
    }
    if (args.length > 1) {
      b = args[1];
    }
    return a + b
}

but this way you lose the semantics of the individual arguments, or

have a method overloaded which relays the call to the parametered version

public int something() {
  return something(1, 2);
}

or if the method is part of some kind of initialization procedure, you could use the builder pattern instead:

class FoodBuilder {
   int saltAmount;
   int meatAmount;
   FoodBuilder setSaltAmount(int saltAmount) {
       this.saltAmount = saltAmount;
       return this;
   }
   FoodBuilder setMeatAmount(int meatAmount) {
       this.meatAmount = meatAmount;
       return this;
   }
   Food build() {
       return new Food(saltAmount, meatAmount);
   }
}

Food f = new FoodBuilder().setSaltAmount(10).build();
Food f2 = new FoodBuilder().setSaltAmount(10).setMeatAmount(5).build();

Then work with the Food object

int doSomething(Food f) {
    return f.getSaltAmount() + f.getMeatAmount();
}

The builder pattern allows you to add/remove parameters later on and you don't need to create new overloaded methods for them.

HTML input file selection event not firing upon selecting the same file

Set the value of the input to null on each onclick event. This will reset the input's value and trigger the onchange event even if the same path is selected.

input.onclick = function () {
    this.value = null;
};

input.onchange = function () {
    alert(this.value);
};?

Here's a DEMO.

Note: It's normal if your file is prefixed with 'C:\fakepath\'. That's a security feature preventing JavaScript from knowing the file's absolute path. The browser still knows it internally.

Easiest way to rotate by 90 degrees an image using OpenCV?

Well I was looking for some details and didn't find any example. So I am posting a transposeImage function which, I hope, will help others who are looking for a direct way to rotate 90° without losing data:

IplImage* transposeImage(IplImage* image) {

    IplImage *rotated = cvCreateImage(cvSize(image->height,image->width),   
        IPL_DEPTH_8U,image->nChannels);
    CvPoint2D32f center;
    float center_val = (float)((image->width)-1) / 2;
    center.x = center_val;
    center.y = center_val;
    CvMat *mapMatrix = cvCreateMat( 2, 3, CV_32FC1 );        
    cv2DRotationMatrix(center, 90, 1.0, mapMatrix);
    cvWarpAffine(image, rotated, mapMatrix, 
        CV_INTER_LINEAR + CV_WARP_FILL_OUTLIERS, 
        cvScalarAll(0));      
    cvReleaseMat(&mapMatrix);

    return rotated;
}

Question : Why this?

float center_val = (float)((image->width)-1) / 2;

Answer : Because it works :) The only center I found that doesn't translate image. Though if somebody has an explanation I would be interested.

Start an external application from a Google Chrome Extension?

There's an extension for Chrome (SimpleGet) that has a plugin for Windows and Linux that can execute an app with command line parameters.....
http://pinel.cc/
http://code.google.com/p/simple-get/
http://www.chromeextensions.org/other/simple-get/

How to format a UTC date as a `YYYY-MM-DD hh:mm:ss` string using NodeJS?

Use the method provided in the Date object as follows:

var ts_hms = new Date();

console.log(
    ts_hms.getFullYear() + '-' + 
    ("0" + (ts_hms.getMonth() + 1)).slice(-2) + '-' + 
    ("0" + (ts_hms.getDate())).slice(-2) + ' ' +
    ("0" + ts_hms.getHours()).slice(-2) + ':' +
    ("0" + ts_hms.getMinutes()).slice(-2) + ':' +
    ("0" + ts_hms.getSeconds()).slice(-2));

It looks really dirty, but it should work fine with JavaScript core methods

View's getWidth() and getHeight() returns 0

Answer with post is incorrect, because the size might not be recalculated.
Another important thing is that the view and all it ancestors must be visible. For that I use a property View.isShown.

Here is my kotlin function, that can be placed somewhere in utils:

fun View.onInitialized(onInit: () -> Unit) {
    viewTreeObserver.addOnGlobalLayoutListener(object : OnGlobalLayoutListener {
        override fun onGlobalLayout() {
            if (isShown) {
                viewTreeObserver.removeOnGlobalLayoutListener(this)
                onInit()
            }
        }
    })
}

And the usage is:

myView.onInitialized {
    Log.d(TAG, "width is: " + myView.width)
}

mongodb, replicates and error: { "$err" : "not master and slaveOk=false", "code" : 13435 }

in mongodb2.0

you should type

rs.slaveOk()

in secondary mongod node

Xcode iOS 8 Keyboard types not supported

If you're getting this bug with Xcode Beta, it's a beta bug and can be ignored (as far as I've been told). If you can build and run on a release build of Xcode without this error, then it is not your app that has the problem.

Not 100% on this, but see if this fixes the problem:

iOS Simulator -> Hardware -> Keyboard -> Toggle Software Keyboard.

Then, everything works

How to dynamically build a JSON object with Python?

You build the object before encoding it to a JSON string:

import json

data = {}
data['key'] = 'value'
json_data = json.dumps(data)

JSON is a serialization format, textual data representing a structure. It is not, itself, that structure.

How to define custom sort function in javascript?

For Objects try this:

function sortBy(field) {
  return function(a, b) {
    if (a[field] > b[field]) {
      return -1;
    } else if (a[field] < b[field]) {
      return 1;
    }
    return 0;
  };
}

Eclipse: Syntax Error, parameterized types are only if source level is 1.5

Do the following..

Right-click on your project--> select properties-----> select Java Compilers

You wills see this window

Image for reference

Now check the checkbox ---> enable project specific settings.

Now set the compiler compliance level to 1.6

Apply then Ok

now clean your project and you are good to go

How to remove close button on the jQuery UI dialog?

The close button added by the Dialog widget has the class 'ui-dialog-titlebar-close', so after your initial call to .dialog(), you can use a statement like this to remove the close button again: It works..

$( 'a.ui-dialog-titlebar-close' ).remove();

Changing the JFrame title

newTitle is a local variable where you create the fields. So when that functions ends, the variable newTitle, does not exist anymore. (The JTextField that was referenced by newTitle does still exist however.)

Thus, increase the scope of the variable, so that you can access it another method.

public SomeFrame extends JFrame {
   JTextField myTitle;//can be used anywhere in this class

   creationOfTheFields()
   {
   //other code
      myTitle = new JTextField("spam");  
      myTitle.setBounds(80, 40, 225, 20);
      options.add(myTitle);
   //blabla other code
   }

   private void New_Name()  
   {  
      this.setTitle(myTitle.getText());  
   } 
}

Using $_POST to get select option value from HTML

You can access values in the $_POST array by their key. $_POST is an associative array, so to access taskOption you would use $_POST['taskOption'];.

Make sure to check if it exists in the $_POST array before proceeding though.

<form method="post" action="process.php">
  <select name="taskOption">
    <option value="first">First</option>
    <option value="second">Second</option>
    <option value="third">Third</option>
  </select>
  <input type="submit" value="Submit the form"/>
</form>

process.php

<?php
   $option = isset($_POST['taskOption']) ? $_POST['taskOption'] : false;
   if ($option) {
      echo htmlentities($_POST['taskOption'], ENT_QUOTES, "UTF-8");
   } else {
     echo "task option is required";
     exit; 
   }

Division of integers in Java

You don't even need doubles for this. Just multiply by 100 first and then divide. Otherwise the result would be less than 1 and get truncated to zero, as you saw.

edit: or if overflow is likely, if it would overflow (ie the dividend is bigger than 922337203685477581), divide the divisor by 100 first.

Console.WriteLine does not show up in Output window

If you are developing a command line application, you can also use Console.ReadLine() at the end of your code to wait for the 'Enter' keypress before closing the console window so that you can read your output. However, both the Trace and Debug answers posted above are better options.

postgres default timezone

Maybe not related to the question, but I needed to use CST, set the system timezone to the desired tz (America/...) and then in postgresql conf set the value of the timezone to 'localtime' and it worked as a charm, current_time printing the right time (Postgresql 9.5 on Ubuntu 16)

Func vs. Action vs. Predicate

Action is a delegate (pointer) to a method, that takes zero, one or more input parameters, but does not return anything.

Func is a delegate (pointer) to a method, that takes zero, one or more input parameters, and returns a value (or reference).

Predicate is a special kind of Func often used for comparisons.

Though widely used with Linq, Action and Func are concepts logically independent of Linq. C++ already contained the basic concept in form of typed function pointers.

Here is a small example for Action and Func without using Linq:

class Program
{
    static void Main(string[] args)
    {
        Action<int> myAction = new Action<int>(DoSomething);
        myAction(123);           // Prints out "123"
                                 // can be also called as myAction.Invoke(123);

        Func<int, double> myFunc = new Func<int, double>(CalculateSomething);
        Console.WriteLine(myFunc(5));   // Prints out "2.5"
    }

    static void DoSomething(int i)
    {
        Console.WriteLine(i);
    }

    static double CalculateSomething(int i)
    {
        return (double)i/2;
    }
}

How to check if a value is not null and not empty string in JS

try it----------

_x000D_

function myFun(){_x000D_
var inputVal=document.getElementById("inputId").value;_x000D_
if(inputVal){_x000D_
document.getElementById("result").innerHTML="<span style='color:green'>The value is "+inputVal+'</span>';_x000D_
}_x000D_
else{_x000D_
document.getElementById("result").innerHTML="<span style='color:red'>Something error happen! the input May be empty.</span>";_x000D_
}_x000D_
}

_x000D_

<input type="text" id="inputId">_x000D_
<input type="button" onclick="myFun()" value="View Result">_x000D_
<h1 id="result"></h1>

_x000D_

Download history stock prices automatically from yahoo finance in python

When you're going to work with such time series in Python, pandas is indispensable. And here's the good news: it comes with a historical data downloader for Yahoo: pandas.io.data.DataReader.

from pandas.io.data import DataReader
from datetime import datetime

ibm = DataReader('IBM',  'yahoo', datetime(2000, 1, 1), datetime(2012, 1, 1))
print(ibm['Adj Close'])

Here's an example from the pandas documentation.

Update for pandas >= 0.19:

The pandas.io.data module has been removed from pandas>=0.19 onwards. Instead, you should use the separate pandas-datareader package. Install with:

pip install pandas-datareader

And then you can do this in Python:

import pandas_datareader as pdr
from datetime import datetime

ibm = pdr.get_data_yahoo(symbols='IBM', start=datetime(2000, 1, 1), end=datetime(2012, 1, 1))
print(ibm['Adj Close'])

Downloading from Google Finance is also supported.

There's more in the documentation of pandas-datareader.

SQL search multiple values in same field

This has been partially answered here: MySQL Like multiple values

I advise against

$search = explode( ' ', $search );

and input them directly into the SQL query as this makes prone to SQL inject via the search bar. You will have to escape the characters first in case they try something funny like: "--; DROP TABLE name;

$search = str_replace('"', "''", search );

But even that is not completely safe. You must try to use SQL prepared statements to be safer. Using the regular expression is much easier to build a function to prepare and create what you want.

function makeSQL_search_pattern($search) {
    search_pattern = false;
    //escape the special regex chars
    $search = str_replace('"', "''", $search);
    $search = str_replace('^', "\\^", $search);
    $search = str_replace('$', "\\$", $search);
    $search = str_replace('.', "\\.", $search);
    $search = str_replace('[', "\\[", $search);
    $search = str_replace(']', "\\]", $search);
    $search = str_replace('|', "\\|", $search);
    $search = str_replace('*', "\\*", $search);
    $search = str_replace('+', "\\+", $search);
    $search = str_replace('{', "\\{", $search);
    $search = str_replace('}', "\\}", $search);
    $search = explode(" ", $search);
    for ($i = 0; $i < count($search); $i++) {
        if ($i > 0 && $i < count($search) ) {
           $search_pattern .= "|";
        }
        $search_pattern .= $search[$i];
    }
    return search_pattern;
}

$search_pattern = makeSQL_search_pattern($search);
$sql_query = "SELECT name FROM Products WHERE name REGEXP :search LIMIT 6"
$stmt = pdo->prepare($sql_query);
$stmt->bindParam(":search", $search_pattern, PDO::PARAM_STR);
$stmt->execute();

I have not tested this code, but this is what I would do in your case. I hope this helps.

How to test if list element exists?

Here is a performance comparison of the proposed methods in other answers.

> foo <- sapply(letters, function(x){runif(5)}, simplify = FALSE)
> microbenchmark::microbenchmark('k' %in% names(foo), 
                                 is.null(foo[['k']]), 
                                 exists('k', where = foo))
Unit: nanoseconds
                     expr  min   lq    mean median   uq   max neval cld
      "k" %in% names(foo)  467  933 1064.31    934  934 10730   100  a 
      is.null(foo[["k"]])    0    0  168.50      1  467  3266   100  a 
 exists("k", where = foo) 6532 6998 7940.78   7232 7465 56917   100   b

If you are planing to use the list as a fast dictionary accessed many times, then the is.null approach might be the only viable option. I assume it is O(1), while the %in% approach is O(n)?

How can I write data attributes using Angular?

Use attribute binding syntax instead

<ol class="viewer-nav"><li *ngFor="let section of sections" 
    [attr.data-sectionvalue]="section.value">{{ section.text }}</li>  
</ol>

<ol class="viewer-nav"><li *ngFor="let section of sections" 
    attr.data-sectionvalue="{{section.value}}">{{ section.text }}</li>  
</ol>

SQL Query for Selecting Multiple Records

Try the following code:

SELECT *
FROM users
WHERE firstname IN ('joe','jane');

Multiple conditions in if statement shell script

if using /bin/sh you can use:

if [ <condition> ] && [ <condition> ]; then
    ...
fi

if using /bin/bash you can use:

if [[ <condition> && <condition> ]]; then
    ...
fi

Change drawable color programmatically

I have wrote a generic function in which you can pass context, icon is id drawable/mipmap image icon and new color which you need for that icon.

This function returns a drawable.

public static Drawable changeDrawableColor(Context context,int icon, int newColor) {
    Drawable mDrawable = ContextCompat.getDrawable(context, icon).mutate(); 
    mDrawable.setColorFilter(new PorterDuffColorFilter(newColor, PorterDuff.Mode.SRC_IN)); 
    return mDrawable;
} 

changeDrawableColor(getContext(),R.mipmap.ic_action_tune, Color.WHITE);

How to remove docker completely from ubuntu 14.04

@miyuru. As suggested by him run all the steps.

Ubuntu version 16.04

Still when I ran docker --version it was returning a version. So to uninstall it completely

Again run the dpkg -l | grep -i docker which will list package still there in system.

For example:

ii  docker-ce-cli      5:19.03.6~3-0~ubuntu-xenial               
amd64        Docker CLI: the open-source application container engine

Now remove them as show below :

sudo apt-get purge -y docker-ce-cli

sudo apt-get autoremove -y --purge docker-ce-cli

sudo apt-get autoclean

Hope this will resolve it, as it did in my case.

What is the "__v" field in Mongoose

Well, I can't see Tony's solution...so I have to handle it myself...

If you don't need version_key, you can just:

var UserSchema = new mongoose.Schema({
    nickname: String,
    reg_time: {type: Date, default: Date.now}
}, {
    versionKey: false // You should be aware of the outcome after set to false
});

Setting the versionKey to false means the document is no longer versioned.

This is problematic if the document contains an array of subdocuments. One of the subdocuments could be deleted, reducing the size of the array. Later on, another operation could access the subdocument in the array at it's original position.

Since the array is now smaller, it may accidentally access the wrong subdocument in the array.

The versionKey solves this by associating the document with the a versionKey, used by mongoose internally to make sure it accesses the right collection version.

More information can be found at: http://aaronheckmann.blogspot.com/2012/06/mongoose-v3-part-1-versioning.html

Pass multiple parameters in Html.BeginForm MVC

Another option I like, which can be generalized once I start seeing the code not conform to DRY, is to use one controller that redirects to another controller.

public ActionResult ClientIdSearch(int cid)
{
  var action = String.Format("Details/{0}", cid);

  return RedirectToAction(action, "Accounts");
}

I find this allows me to apply my logic in one location and re-use it without have to sprinkle JavaScript in the views to handle this. And, as I mentioned I can then refactor for re-use as I see this getting abused.

Mac install and open mysql using terminal

In the terminal, I typed:

/usr/local/mysql/bin/mysql -u root -p

I was then prompted to enter the temporary password that was given to me upon completion of the installation.

How can I get dictionary key as variable directly in Python (not by searching from value)?

You could simply use * which unpacks the dictionary keys. Example:

d = {'x': 1, 'y': 2}
t = (*d,)
print(t) # ('x', 'y')

How can I strip first and last double quotes?

IMPORTANT: I'm extending the question/answer to strip either single or double quotes. And I interpret the question to mean that BOTH quotes must be present, and matching, to perform the strip. Otherwise, the string is returned unchanged.

To "dequote" a string representation, that might have either single or double quotes around it (this is an extension of @tgray's answer):

def dequote(s):
    """
    If a string has single or double quotes around it, remove them.
    Make sure the pair of quotes match.
    If a matching pair of quotes is not found, return the string unchanged.
    """
    if (s[0] == s[-1]) and s.startswith(("'", '"')):
        return s[1:-1]
    return s

Explanation:

startswith can take a tuple, to match any of several alternatives. The reason for the DOUBLED parentheses (( and )) is so that we pass ONE parameter ("'", '"') to startswith(), to specify the permitted prefixes, rather than TWO parameters "'" and '"', which would be interpreted as a prefix and an (invalid) start position.

s[-1] is the last character in the string.

Testing:

print( dequote("\"he\"l'lo\"") )
print( dequote("'he\"l'lo'") )
print( dequote("he\"l'lo") )
print( dequote("'he\"l'lo\"") )

he"l'lo
he"l'lo
he"l'lo
'he"l'lo"

(For me, regex expressions are non-obvious to read, so I didn't try to extend @Alex's answer.)

typeof !== "undefined" vs. != null

if (input == undefined) { ... }

works just fine. It is of course not a null comparison, but I usually find that if I need to distinguish between undefined and null, I actually rather need to distinguish between undefined and just any false value, so

else if (input) { ... }

does it.

If a program redefines undefined it is really braindead anyway.

The only reason I can think of was for IE4 compatibility, it did not understand the undefined keyword (which is not actually a keyword, unfortunately), but of course values could be undefined, so you had to have this:

var undefined;

and the comparison above would work just fine.

In your second example, you probably need double parentheses to make lint happy?

The specified child already has a parent. You must call removeView() on the child's parent first

In onCreate with activity or onCreateView with fragment

 if (view != null) {
    ViewGroup parent = (ViewGroup) view.getParent();
    if (parent != null) {
        parent.removeView(view);
    }
}
try {
    view = inflater.inflate(R.layout.fragment_main, container, false);
} catch (InflateException e) {
    e.printStackTrace();
}

how to change a selections options based on another select option selected?

You can use switch case like this:

_x000D_

$(document).ready(function () {_x000D_
  $("#type").change(function () {_x000D_
     switch($(this).val()) {_x000D_
        case 'item1':_x000D_
            $("#size").html("<option value='test'>item1: test 1</option><option value='test2'>item1: test 2</option>");_x000D_
            break;_x000D_
        case 'item2':_x000D_
            $("#size").html("<option value='test'>item2: test 1</option><option value='test2'>item2: test 2</option>");_x000D_
            break;_x000D_
        case 'item3':_x000D_
            $("#size").html("<option value='test'>item3: test 1</option><option value='test2'>item3: test 2</option>");_x000D_
            break;_x000D_
        default:_x000D_
            $("#size").html("<option value=''>--select one--</option>");_x000D_
     }_x000D_
  });_x000D_
});

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<select id="type">_x000D_
    <option value="item0">--Select an Item--</option>_x000D_
    <option value="item1">item1</option>_x000D_
    <option value="item2">item2</option>_x000D_
    <option value="item3">item3</option>_x000D_
</select>_x000D_
_x000D_
<select id="size">_x000D_
    <option value="">-- select one -- </option>_x000D_
</select>

_x000D_

Run PostgreSQL queries from the command line

If your DB is password protected, then the solution would be:

PGPASSWORD=password  psql -U username -d dbname -c "select * from my_table"

How to show only next line after the matched one?

Great answer from raim, was very useful for me. It is trivial to extend this to print e.g. line 7 after the pattern

awk -v lines=7 '/blah/ {for(i=lines;i;--i)getline; print $0 }' logfile

Setting an HTML text input box's "default" value. Revert the value when clicking ESC

If the question is: "Is it possible to add value on ESC" than the answer is yes. You can do something like that. For example with use of jQuery it would look like below.

HTML

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>

<input type="text" value="default!" id="myInput" />

JavaScript

$(document).ready(function (){
    $('#myInput').keyup(function(event) {
        // 27 is key code of ESC
        if (event.keyCode == 27) {
            $('#myInput').val('default!');
            // Loose focus on input field
            $('#myInput').blur();
        }
    });
});

Working source can be found here: http://jsfiddle.net/S3N5H/1/

Please let me know if you meant something different, I can adjust the code later.

How to get current time in milliseconds in PHP?

echo date('Y-m-d H:i:s.') . gettimeofday()['usec'];

output:

2016-11-19 15:12:34.346351

Get current location of user in Android without using GPS or internet

boolean gps_enabled = false;
boolean network_enabled = false;

LocationManager lm = (LocationManager) mCtx
                .getSystemService(Context.LOCATION_SERVICE);

gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
network_enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

Location net_loc = null, gps_loc = null, finalLoc = null;

if (gps_enabled)
    gps_loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (network_enabled)
    net_loc = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

if (gps_loc != null && net_loc != null) {

    //smaller the number more accurate result will
    if (gps_loc.getAccuracy() > net_loc.getAccuracy()) 
        finalLoc = net_loc;
    else
        finalLoc = gps_loc;

        // I used this just to get an idea (if both avail, its upto you which you want to take as I've taken location with more accuracy)

} else {

    if (gps_loc != null) {
        finalLoc = gps_loc;
    } else if (net_loc != null) {
        finalLoc = net_loc;
    }
}

How do I URL encode a string

New APIs have been added since the answer was selected; You can now use NSURLUtilities. Since different parts of URLs allow different characters, use the applicable character set. The following example encodes for inclusion in the query string:

encodedString = [myString stringByAddingPercentEncodingWithAllowedCharacters:NSCharacterSet.URLQueryAllowedCharacterSet];

To specifically convert '&', you'll need to remove it from the url query set or use a different set, as '&' is allowed in a URL query:

NSMutableCharacterSet *chars = NSCharacterSet.URLQueryAllowedCharacterSet.mutableCopy;
[chars removeCharactersInRange:NSMakeRange('&', 1)]; // %26
encodedString = [myString stringByAddingPercentEncodingWithAllowedCharacters:chars];

To check if string contains particular word

It's been correctly pointed out above that finding a given word in a sentence is not the same as finding the charsequence, and can be done as follows if you don't want to mess around with regular expressions.

boolean checkWordExistence(String word, String sentence) {
    if (sentence.contains(word)) {
        int start = sentence.indexOf(word);
        int end = start + word.length();

        boolean valid_left = ((start == 0) || (sentence.charAt(start - 1) == ' '));
        boolean valid_right = ((end == sentence.length()) || (sentence.charAt(end) == ' '));

        return valid_left && valid_right;
    }
    return false;
}

Output:

checkWordExistence("the", "the earth is our planet"); true
checkWordExistence("ear", "the earth is our planet"); false
checkWordExistence("earth", "the earth is our planet"); true

P.S Make sure you have filtered out any commas or full stops beforehand.

MySQL Query to select data from last week?

SELECT id FROM table1
WHERE YEARWEEK(date) = YEARWEEK(NOW() - INTERVAL 1 WEEK)

I use the YEARWEEK function specifically to go back to the prior whole calendar week (as opposed to 7 days before today). YEARWEEK also allows a second argument that will set the start of the week or determine how the first/last week of the year are handled. YEARWEEK lets you to keep the number of weeks to go back/forward in a single variable, and will not include the same week number from prior/future years, and it's far shorter than most of the other answers on here.

jQuery Combobox/select autocomplete?

This works great for me and I'm doing more, writing less with jQuery's example modified.

I defined the select object on my page, just like the jQuery ex. I took the text and pushed it to an array. Then I use the array as my source to my input autocomplete. tadaa.

$(function() {
   var mySource = [];
   $("#mySelect").children("option").map(function() {
      mySource.push($(this).text());
   });

   $("#myInput").autocomplete({
      source: mySource,
      minLength: 3
   });
}

What is the difference between 0.0.0.0, 127.0.0.1 and localhost?

127.0.0.1 is normally the IP address assigned to the "loopback" or local-only interface. This is a "fake" network adapter that can only communicate within the same host. It's often used when you want a network-capable application to only serve clients on the same host. A process that is listening on 127.0.0.1 for connections will only receive local connections on that socket.

"localhost" is normally the hostname for the 127.0.0.1 IP address. It's usually set in /etc/hosts (or the Windows equivalent named "hosts" somewhere under %WINDIR%). You can use it just like any other hostname - try "ping localhost" to see how it resolves to 127.0.0.1.

0.0.0.0 has a couple of different meanings, but in this context, when a server is told to listen on 0.0.0.0 that means "listen on every available network interface". The loopback adapter with IP address 127.0.0.1 from the perspective of the server process looks just like any other network adapter on the machine, so a server told to listen on 0.0.0.0 will accept connections on that interface too.

That hopefully answers the IP side of your question. I'm not familiar with Jekyll or Vagrant, but I'm guessing that your port forwarding 8080 => 4000 is somehow bound to a particular network adapter, so it isn't in the path when you connect locally to 127.0.0.1

How do you add an SDK to Android Studio?

And For linux(ubuntu)

/usr/share/android-studio/data/sdk

When do items in HTML5 local storage expire?

Here highly recommended to use sessionStorage

it is same as localStorage but destroy when session destroyed / browser close
also localStorage can share between tabs while sessionStorage can use in current tab only, but value does not change on refresh page or change the page
sessionStorage is also useful to reduce network traffic against cookie

for set value use

sessionStorage.setItem("key","my value");

for get value use

var value = sessionStorage.getItem("key");

click here for view api

all ways for set are

  sessionStorage.key = "my val";
  sessionStorage["key"] = "my val";
  sessionStorage.setItem("key","my value");

all ways for get are

  var value = sessionStorage.key;
  var value = sessionStorage["key"];
  var value = sessionStorage.getItem("key");

How does `scp` differ from `rsync`?

There's a distinction to me that scp is always encrypted with ssh (secure shell), while rsync isn't necessarily encrypted. More specifically, rsync doesn't perform any encryption by itself; it's still capable of using other mechanisms (ssh for example) to perform encryption.

In addition to security, encryption also has a major impact on your transfer speed, as well as the CPU overhead. (My experience is that rsync can be significantly faster than scp.)

Check out this post for when rsync has encryption on.

iOS Detection of Screenshot?

Swift 4+

NotificationCenter.default.addObserver(forName: UIApplication.userDidTakeScreenshotNotification, object: nil, queue: OperationQueue.main) { notification in
           //you can do anything you want here. 
        }

by using this observer you can find out when user takes a screenshot, but you can not prevent him.

UIView bottom border?

Implemented in a category as below:

UIButton+Border.h:

@interface UIButton (Border)

- (void)addBottomBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

- (void)addLeftBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

- (void)addRightBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

- (void)addTopBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

@end

UIButton+Border.m:

@implementation UIButton (Border)

- (void)addTopBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    CALayer *border = [CALayer layer];
    border.backgroundColor = color.CGColor;

    border.frame = CGRectMake(0, 0, self.frame.size.width, borderWidth);
    [self.layer addSublayer:border];
}

- (void)addBottomBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    CALayer *border = [CALayer layer];
    border.backgroundColor = color.CGColor;

    border.frame = CGRectMake(0, self.frame.size.height - borderWidth, self.frame.size.width, borderWidth);
    [self.layer addSublayer:border];
}

- (void)addLeftBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    CALayer *border = [CALayer layer];
    border.backgroundColor = color.CGColor;

    border.frame = CGRectMake(0, 0, borderWidth, self.frame.size.height);
    [self.layer addSublayer:border];
}

- (void)addRightBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    CALayer *border = [CALayer layer];
    border.backgroundColor = color.CGColor;

    border.frame = CGRectMake(self.frame.size.width - borderWidth, 0, borderWidth, self.frame.size.height);
    [self.layer addSublayer:border];
}

@end

Styling multi-line conditions in 'if' statements?

This doesn't improve so much but...

allCondsAreOK = (cond1 == 'val1' and cond2 == 'val2' and
                 cond3 == 'val3' and cond4 == 'val4')

if allCondsAreOK:
   do_something

Number of visitors on a specific page

As Blexy already answered, go to "Behavior > Site Content > All Pages".

Just pay attention that "Behavior" appears two times in the left sidebar and we need to click on the second option:

How to inspect FormData?

  function abc(){ 
    var form = $('#form_name')[0]; 
        var formData = new FormData(form);
        for (var [key, value] of formData.entries()) { 
            console.log(key, value);
        }
        $.ajax({
            type: "POST",
            url: " ",
            data:  formData,
            contentType: false,
            cache: false,
            processData:false,
            beforeSend: function() {

            },
            success: function(data) {


            },

       });
}

Benefits of EBS vs. instance-store (and vice-versa)

Most people choose to use EBS backed instance as it is stateful. It is to safer because everything you have running and installed inside it, will survive stop/stop or any instance failure.

Instance store is stateless, you loose it with all the data inside in case of any instance failure situation. However, it is free and faster because the instance volume is tied to the physical server where the VM is running.

Convert String to Date in MS Access Query

If you need to display all the records after 2014-09-01, add this to your query:

SELECT * FROM Events
WHERE Format(Events.DATE_TIME,'yyyy-MM-dd hh:mm:ss')  >= Format("2014-09-01 00:00:00","yyyy-MM-dd hh:mm:ss")

Best TCP port number range for internal applications

Short answer: use an unassigned user port

Over achiever's answer - Select and deploy a resource discovery solution. Have the server select a private port dynamically. Have the clients use resource discovery.

The risk that that a server will fail because the port it wants to listen on is not available is real; at least it's happened to me. Another service or a client might get there first.

You can almost totally reduce the risk from a client by avoiding the private ports, which are dynamically handed out to clients.

The risk that from another service is minimal if you use a user port. An unassigned port's risk is only that another service happens to be configured (or dyamically) uses that port. But at least that's probably under your control.

The huge doc with all the port assignments, including User Ports, is here: http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt look for the token Unassigned.

Checkout remote branch using git svn

Standard Subversion layout

Create a git clone of that includes your Subversion trunk, tags, and branches with

git svn clone http://svn.example.com/project -T trunk -b branches -t tags

The --stdlayout option is a nice shortcut if your Subversion repository uses the typical structure:

git svn clone http://svn.example.com/project --stdlayout

Make your git repository ignore everything the subversion repo does:

git svn show-ignore >> .git/info/exclude

You should now be able to see all the Subversion branches on the git side:

git branch -r

Say the name of the branch in Subversion is waldo. On the git side, you'd run

git checkout -b waldo-svn remotes/waldo

The -svn suffix is to avoid warnings of the form

warning: refname 'waldo' is ambiguous.

To update the git branch waldo-svn, run

git checkout waldo-svn
git svn rebase

Starting from a trunk-only checkout

To add a Subversion branch to a trunk-only clone, modify your git repository's .git/config to contain

[svn-remote "svn-mybranch"]
        url = http://svn.example.com/project/branches/mybranch
        fetch = :refs/remotes/mybranch

You'll need to develop the habit of running

git svn fetch --fetch-all

to update all of what git svn thinks are separate remotes. At this point, you can create and track branches as above. For example, to create a git branch that corresponds to mybranch, run

git checkout -b mybranch-svn remotes/mybranch

For the branches from which you intend to git svn dcommit, keep their histories linear!

Further information

You may also be interested in reading an answer to a related question.

Pass a simple string from controller to a view MVC3

If you are trying to simply return a string to a View, try this:

public string Test()
{
     return "test";
}

This will return a view with the word test in it. You can insert some html in the string.

You can also try this:

public ActionResult Index()
{
    return Content("<html><b>test</b></html>");
}

Fatal error: Class 'PHPMailer' not found

PHPMailerAutoload needs to be in the same folder as class.phpmailer.php

This is the PHPMailerAutoload code that I assume this:

 $filename = dirname(__FILE__).DIRECTORY_SEPARATOR.'class.'.strtolower($classname).'.php';

How to make modal dialog in WPF?

Did you try showing your window using the ShowDialog method?

Don't forget to set the Owner property on the dialog window to the main window. This will avoid weird behavior when Alt+Tabbing, etc.

What is Java EE?

Java EE is a collection of specifications for developing and deploying enterprise applications.

In general, enterprise applications refer to software hosted on servers that provide the applications that support the enterprise.

The specifications (defined by Sun) describe services, application programming interfaces (APIs), and protocols.

The 13 core technologies that make up Java EE are:

JDBC
JNDI
EJBs
RMI
JSP
Java servlets
XML
JMS
Java IDL
JTS
JTA
JavaMail
JAF

The Java EE product provider is typically an application-server, web-server, or database-system vendor who provides classes that implement the interfaces defined in the specifications. These vendors compete on implementations of the Java EE specifications.

When a company requires Java EE experience what are they really asking for is experience using the technologies that make up Java EE. Frequently, a company will only be using a subset of the Java EE technologies.

Java Scanner String input

When you read in the year month day hour minutes with something like nextInt() it leaves rest of the line in the parser/buffer (even if it is blank) so when you call nextLine() you are reading the rest of this first line.

I suggest you to use scan.next() instead of scan.nextLine().

XPath: Get parent node from child node

Just as an alternative, you can use ancestor.

//*[title="50"]/ancestor::store

It's more powerful than parent since it can get even the grandparent or great great grandparent

Programs & Examples On #File organization

error TS1086: An accessor cannot be declared in an ambient context in Angular 9

What is the default username and password in Tomcat?

Redirect to a page/URL after alert button is pressed

How to get the Android Emulator's IP address?

How do I check my gcc C++ compiler version for my Eclipse?

How to add "on delete cascade" constraints?

How can I group data with an Angular filter?

Convert pandas DataFrame into list of lists

Generating a SHA-256 hash from the Linux command line

Bulk load data conversion error (type mismatch or invalid character for the specified codepage) for row 1, column 4 (Year)

How to convert an array to a string in PHP?

How do I check whether input string contains any spaces?

Javascript: How to detect if browser window is scrolled to bottom?

How to get the URL of the current page in C#

Angular2 Error: There is no directive with "exportAs" set to "ngForm"

Select all text inside EditText when it gets focus

Kill a postgresql session/connection

How to set alignment center in TextBox in ASP.NET?

How to check if another instance of the application is running

ASP.NET: Session.SessionID changes between requests

How to grab substring before a specified character jQuery or JavaScript

Trigger a Travis-CI rebuild without pushing a commit?

Jquery and HTML FormData returns "Uncaught TypeError: Illegal invocation"

How to enable scrolling of content inside a modal?

How to block until an event is fired in c#

WPF: simple TextBox data binding

Search an Oracle database for tables with specific column names?

Check folder size in Bash

How do I remove a MySQL database?

how to refresh page in angular 2

Text border using css (border around text)

What are all codecs and formats supported by FFmpeg?

How do I apply the for-each loop to every character in a String?

Show default value in Spinner in android

Arrays.fill with multidimensional array in Java

How to append output to the end of a text file

How do I enable --enable-soap in php on linux?

Importing CSV File to Google Maps

Conditional WHERE clause with CASE statement in Oracle

How to remove an HTML element using Javascript?

Finding square root without using sqrt function?

Select first 10 distinct rows in mysql

How to change Angular CLI favicon

Tkinter: "Python may not be configured for Tk"

API pagination best practices

Python can't find module in the same folder

Define preprocessor macro through CMake?

What are the differences between Visual Studio Code and Visual Studio?

How do I create a comma-separated list using a SQL query?

What is RSS and VSZ in Linux memory management

Why Anaconda does not recognize conda command?

Use sudo with password as parameter

Use jQuery to get the file input's selected filename without the path

Removing Conda environment

X close button only using css

Is there a command to refresh environment variables from the command prompt in Windows?

customize Android Facebook Login button

What does -Xmn jvm option stands for

OSError - Errno 13 Permission denied

How to get Python requests to trust a self signed SSL certificate?

How can I create a progress bar in Excel VBA?

How to use `@ts-ignore` for a block

Kotlin Android start new Activity

Details

Step 1. Application()

Step 2. Add Router object

Usage

How do you cache an image in Javascript

Download single files from GitHub

Random row selection in Pandas dataframe

Random "Element is no longer attached to the DOM" StaleElementReferenceException

Can I use if (pointer) instead of if (pointer != NULL)?

<button> vs. <input type="button" />. Which to use?

How to select only 1 row from oracle sql?

Is there a way to remove unused imports and declarations from Angular 2+?

Peak detection in a 2D array

transform object to array with lodash

If using maven, usually you put log4j.properties under java or resources?

'sprintf': double precision in C