Have a reloadData for a UITableView animate when changing

Have more freedom using `CATransition` class.

It isn't limited to fading, but can do movements as well..

For example:

(don't forget to import QuartzCore)

CATransition *transition = [CATransition animation];
transition.type = kCATransitionPush;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.fillMode = kCAFillModeForwards;
transition.duration = 0.5;
transition.subtype = kCATransitionFromBottom;

[[self.tableView layer] addAnimation:transition forKey:@"UITableViewReloadDataAnimationKey"];

Change the type to match your needs, like kCATransitionFade etc.

Implementation in Swift:

let transition = CATransition()
transition.type = kCATransitionPush
transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
transition.fillMode = kCAFillModeForwards
transition.duration = 0.5
transition.subtype = kCATransitionFromTop
self.tableView.layer.addAnimation(transition, forKey: "UITableViewReloadDataAnimationKey")
// Update your data source here
self.tableView.reloadData()

Reference for CATransition

Swift 5:

let transition = CATransition()
transition.type = CATransitionType.push
transition.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
transition.fillMode = CAMediaTimingFillMode.forwards
transition.duration = 0.5
transition.subtype = CATransitionSubtype.fromTop
self.tableView.layer.add(transition, forKey: "UITableViewReloadDataAnimationKey")
// Update your data source here
self.tableView.reloadData()

Installing tkinter on ubuntu 14.04

Try:

sudo apt-get install python-tk python3-tk tk-dev

If you're using python3, then Python3 virtual environment(venv) is also required. Use:

sudo apt install python3-venv

Simple search MySQL database using php

Just with the above answer I hope it was the problem.

$_POST['search'] instead of $_post['search']

And again use LIKE '%$name%' instead of LIKE '%{$name}%'

JRE 1.7 - java version - returns: java/lang/NoClassDefFoundError: java/lang/Object

I faced same issue, I have installed two java version hence it caused this issue. to confirm this go and click java icon in control panel if doesnt open then issue is same, just go and uninstall one version. piece of cake. thanks.

Convert a space delimited string to list

states_list = states.split(' ')

In regards to your edit:

from random import choice
random_state = choice(states_list)

Removing underline with href attribute

Add a style with the attribute text-decoration:none;:

There are a number of different ways of doing this.

Inline style:

<a href="xxx.html" style="text-decoration:none;">goto this link</a>

Inline stylesheet:

<html>
<head>
<style type="text/css">
   a {
      text-decoration:none;
   }
</style>
</head>
<body>
<a href="xxx.html">goto this link</a>
</body>
</html>

External stylesheet:

<html>
<head>
<link rel="Stylesheet" href="stylesheet.css" />
</head>
<body>
<a href="xxx.html">goto this link</a>
</body>
</html>

stylesheet.css:

a {
      text-decoration:none;
   }

Returning Month Name in SQL Server Query

In SQL Server 2012 it is possible to use FORMAT(@mydate, 'MMMM') AS MonthName

What does git rev-parse do?

git rev-parse is an ancillary plumbing command primarily used for manipulation.

One common usage of git rev-parse is to print the SHA1 hashes given a revision specifier. In addition, it has various options to format this output such as --short for printing a shorter unique SHA1.

There are other use cases as well (in scripts and other tools built on top of git) that I've used for:

--verify to verify that the specified object is a valid git object.
--git-dir for displaying the abs/relative path of the the .git directory.
Checking if you're currently within a repository using --is-inside-git-dir or within a work-tree using --is-inside-work-tree
Checking if the repo is a bare using --is-bare-repository
Printing SHA1 hashes of branches (--branches), tags (--tags) and the refs can also be filtered based on the remote (using --remote)
--parse-opt to normalize arguments in a script (kind of similar to getopt) and print an output string that can be used with eval

Massage just implies that it is possible to convert the info from one form into another i.e. a transformation command. These are some quick examples I can think of:

a branch or tag name into the commit's SHA1 it is pointing to so that it can be passed to a plumbing command which only accepts SHA1 values for the commit.
a revision range A..B for git log or git diff into the equivalent arguments for the underlying plumbing command as B ^A

How do malloc() and free() work?

One implementation of malloc/free does the following:

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

Jenkins - how to build a specific branch

Best solution can be:

Add a string parameter in the existing job

Then in the Source Code Management section update Branches to build to use the string parameter you defined

If you see a checkbox labeled Lightweight checkout, make sure it is unchecked.

The configuration indicated in the images will tell the jenkins job to use master as the default branch, and for manual builds it will ask you to enter branch details (FYI: by default it's set to master)

HTTP GET in VB.NET

You can use the HttpWebRequest class to perform a request and retrieve a response from a given URL. You'll use it like:

Try
    Dim fr As System.Net.HttpWebRequest
    Dim targetURI As New Uri("http://whatever.you.want.to.get/file.html")         

    fr = DirectCast(HttpWebRequest.Create(targetURI), System.Net.HttpWebRequest)
    If (fr.GetResponse().ContentLength > 0) Then
        Dim str As New System.IO.StreamReader(fr.GetResponse().GetResponseStream())
        Response.Write(str.ReadToEnd())
        str.Close(); 
    End If   
Catch ex As System.Net.WebException
   'Error in accessing the resource, handle it
End Try

HttpWebRequest is detailed at: http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.aspx

A second option is to use the WebClient class, this provides an easier to use interface for downloading web resources but is not as flexible as HttpWebRequest:

Sub Main()
    'Address of URL
    Dim URL As String = http://whatever.com
    ' Get HTML data
    Dim client As WebClient = New WebClient()
    Dim data As Stream = client.OpenRead(URL)
    Dim reader As StreamReader = New StreamReader(data)
    Dim str As String = ""
    str = reader.ReadLine()
    Do While str.Length > 0
        Console.WriteLine(str)
        str = reader.ReadLine()
    Loop
End Sub

More info on the webclient can be found at: http://msdn.microsoft.com/en-us/library/system.net.webclient.aspx

illegal use of break statement; javascript

break is to break out of a loop like for, while, switch etc which you don't have here, you need to use return to break the execution flow of the current function and return to the caller.

function loop() {
    if (isPlaying) {
        jet1.draw();
        drawAllEnemies();
        requestAnimFrame(loop);
        if (game == 1) {
           return
        }
    }
}

Note: This does not cover the logic behind the if condition or when to return from the method, for that we need to have more context regarding the drawAllEnemies and requestAnimFrame method as well as how game value is updated

Check whether number is even or odd

Least significant bit (rightmost) can be used to check if the number is even or odd. For all Odd numbers, rightmost bit is always 1 in binary representation.

public static boolean checkOdd(long number){
   return ((number & 0x1) == 1);
}

Sending HTML email using Python

Here is my answer for AWS using boto3

    subject = "Hello"
    html = "<b>Hello Consumer</b>"

    client = boto3.client('ses', region_name='us-east-1', aws_access_key_id="your_key",
                      aws_secret_access_key="your_secret")

client.send_email(
    Source='ACME <[email protected]>',
    Destination={'ToAddresses': [email]},
    Message={
        'Subject': {'Data': subject},
        'Body': {
            'Html': {'Data': html}
        }
    }

iPhone UIView Animation Best Practice

Here is Code for Smooth animation, might Be helpful for many developers.
I found this snippet of code from this tutorial.

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[animation setAutoreverses:YES];
[animation setFromValue:[NSNumber numberWithFloat:1.3f]];
[animation setToValue:[NSNumber numberWithFloat:1.f]];
[animation setDuration:2.f];
[animation setRemovedOnCompletion:NO];

[animation setFillMode:kCAFillModeForwards];
[[self.myView layer] addAnimation:animation forKey:@"scale"];/// add here any Controller that you want t put Smooth animation.

jQuery hyperlinks - href value?

you shoud use <a href="javascript:void(0)" ></a> instead of <a href="#" ></a>

Failed to find 'ANDROID_HOME' environment variable

This solved my problem. Add below to your system path

PATH_TO_android\platforms

PATH_TO_android\platform-tools

Create web service proxy in Visual Studio from a WSDL file

Try using WSDL.exe and then including the generated file (.cs) into your project.

Fire up the Visual Studio Command prompt (under visual studio/tools in the start menu) then type

>wsdl.exe [path To Your WSDL File]

That'll spit out a file, which you copy/move and include in your project. That file contains a class which is a proxy to your sevice, Fire up an instance of that class, and it'll have a URL property you can set on the fly, and a bunch of methods that you can call. It'll also generate classes for all/any complex objects passed across the service interface.

How do I calculate tables size in Oracle

First off, I would generally caution that gathering table statistics in order to do space analysis is a potentially dangerous thing to do. Gathering statistics may change query plans, particularly if the DBA has configured a statistics gathering job that uses non-default parameters that your call is not using, and will cause Oracle to re-parse queries that utilize the table in question which can be a performance hit. If the DBA has intentionally left some tables without statistics (common if your OPTIMIZER_MODE is CHOOSE), gathering statistics can cause Oracle to stop using the rule-based optimizer and start using the cost-based optimizer for a set of queries which can be a major performance headache if it is done unexpectedly in production. If your statistics are accurate, you can query USER_TABLES (or ALL_TABLES or DBA_TABLES) directly without calling GATHER_TABLE_STATS. If your statistics are not accurate, there is probably a reason for that and you don't want to disturb the status quo.

Second, the closest equivalent to the SQL Server sp_spaceused procedure is likely Oracle's DBMS_SPACE package. Tom Kyte has a nice show_space procedure that provides a simple interface to this package and prints out information similar to what sp_spaceused prints out.

Get a timestamp in C in microseconds?

timespec_get from C11 returns up to nanoseconds, rounded to the resolution of the implementation.

#include <time.h>
struct timespec ts;
timespec_get(&ts, TIME_UTC);
struct timespec {
    time_t   tv_sec;        /* seconds */
    long     tv_nsec;       /* nanoseconds */
};

More details here: https://stackoverflow.com/a/36095407/895245

How to convert an integer (time) to HH:MM:SS::00 in SQL Server 2008?

This will work:

DECLARE @MS INT = 235216
select cast(dateadd(ms, @MS, '00:00:00') AS TIME(3))

(where ms is just a number of seconds not a timeformat)

Select count(*) from multiple tables

If the tables (or at least a key column) are of the same type just make the union first and then count.

select count(*) 
  from (select tab1key as key from schema.tab1 
        union all 
        select tab2key as key from schema.tab2
       )

Or take your satement and put another sum() around it.

select sum(amount) from
(
select count(*) amount from schema.tab1 union all select count(*) amount from schema.tab2
)

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

I've worked on something similar. Had to convert canvas Base64-encoded image to Uint8Array Blob.

function b64ToUint8Array(b64Image) {
   var img = atob(b64Image.split(',')[1]);
   var img_buffer = [];
   var i = 0;
   while (i < img.length) {
      img_buffer.push(img.charCodeAt(i));
      i++;
   }
   return new Uint8Array(img_buffer);
}

var b64Image = canvas.toDataURL('image/jpeg');
var u8Image  = b64ToUint8Array(b64Image);

var formData = new FormData();
formData.append("image", new Blob([ u8Image ], {type: "image/jpg"}));

var xhr = new XMLHttpRequest();
xhr.open("POST", "/api/upload", true);
xhr.send(formData);

NodeJS / Express: what is "app.use"?

app.use() is a method that allows us to register a middleware.

The middleware method is like an interceptor in java, this method always executes for all requests.

Purpose and use of middleware:-

To check if the session expired or not
for user authentication and authorization
check for cookie (expiry date)
parse data before the response

How to test enum types?

I agree with aberrant80.

For enums, I test them only when they actually have methods in them. If it's a pure value-only enum like your example, I'd say don't bother.

But since you're keen on testing it, going with your second option is much better than the first. The problem with the first is that if you use an IDE, any renaming on the enums would also rename the ones in your test class.

I would expand on it by adding that unit testings an Enum can be very useful. If you work in a large code base, build time starts to mount up and a unit test can be a faster way to verify functionality (tests only build their dependencies). Another really big advantage is that other developers cannot change the functionality of your code unintentionally (a huge problem with very large teams).

And with all Test Driven Development, tests around an Enums Methods reduce the number of bugs in your code base.

Simple Example

public enum Multiplier {
    DOUBLE(2.0),
    TRIPLE(3.0);

    private final double multiplier;

    Multiplier(double multiplier) {
        this.multiplier = multiplier;
    }

    Double applyMultiplier(Double value) {
        return multiplier * value;
    }

}

public class MultiplierTest {

    @Test
    public void should() {
        assertThat(Multiplier.DOUBLE.applyMultiplier(1.0), is(2.0));
        assertThat(Multiplier.TRIPLE.applyMultiplier(1.0), is(3.0));
    }
}

Increase days to php current Date()

You can also use Object Oriented Programming (OOP) instead of procedural programming:

$fiveDays = new DateInterval('P5D');
$today = new DateTime();
$fiveDaysAgo = $today->sub(fiveDays); // or ->add(fiveDays); to add 5 days

Or with just one line of code:

$fiveDaysAgo = (new DateTime())->sub(new DateInterval('P5D'));

CSS background-image not working

The easy way is that, copy and past this background-image: url(../slide_button.png); instead of background-image: url(slide_button.png); In such case we need to use ../ before path. Either you need to give full path. One other thing is that, in case before doing any change just clear the browser history and then refresh the page.

How do you convert between 12 hour time and 24 hour time in PHP?

// 24-hour time to 12-hour time 
$time_in_12_hour_format  = date("g:i a", strtotime("13:30"));

// 12-hour time to 24-hour time 
$time_in_24_hour_format  = date("H:i", strtotime("1:30 PM"));

How do I round to the nearest 0.5?

There are several options. If performance is a concern, test them to see which works fastest in a large loop.

double Adjust(double input)
{
    double whole = Math.Truncate(input);
    double remainder = input - whole;
    if (remainder < 0.3)
    {
        remainder = 0;
    }
    else if (remainder < 0.8)
    {
        remainder = 0.5;
    }
    else
    {
        remainder = 1;
    }
    return whole + remainder;
}

PHP how to get local IP of system

$_SERVER['REMOTE_ADDR']

PHP_SELF Returns the filename of the current script with the path relative to the root
SERVER_PROTOCOL Returns the name and revision of the page-requested protocol
REQUEST_METHOD Returns the request method used to access the page
DOCUMENT_ROOT Returns the root directory under which the current script is executing

foreach vs someList.ForEach(){}

The entire ForEach scope (delegate function) is treated as a single line of code (calling the function), and you cannot set breakpoints or step into the code. If an unhandled exception occurs the entire block is marked.

How can I solve equations in Python?

Python may be good, but it isn't God...

There are a few different ways to solve equations. SymPy has already been mentioned, if you're looking for analytic solutions.

If you're happy to just have a numerical solution, Numpy has a few routines that can help. If you're just interested in solutions to polynomials, numpy.roots will work. Specifically for the case you mentioned:

>>> import numpy
>>> numpy.roots([2,-6])
array([3.0])

For more complicated expressions, have a look at scipy.fsolve.

Either way, you can't escape using a library.

VBScript: Using WScript.Shell to Execute a Command Line Program That Accesses Active Directory

Taking Shiraz's idea and running with it...

In your application, are you explicitly defining a domain User Account and Password to access AD?

When you are executing the application explicitly it may be inherently using your credentials (your currently logged in domain account) to interrogate AD. However, when calling the application from the script, I'm not sure if the application is in the System context.

A VBScript example would be as follows:

  Dim objConnection As ADODB.Connection
    Set objConnection = CreateObject("ADODB.Connection")
    objConnection.Provider = "ADsDSOObject"
    objConnection.Properties("User ID") = "MyDomain\MyAccount"
    objConnection.Properties("Password") = "MyPassword"
    objConnection.Open "Active Directory Provider"

If this works, of course it would be best practice to create and use a service account specifically for this task, and to deny interactive login to that account.

Right align text in android TextView

In my case, I was using Relative Layout for a emptyString

After struggling on this for an hour. Only this worked for me:

android:layout_toRightOf="@id/welcome"
android:layout_toEndOf="@id/welcome"
android:layout_alignBaseline="@id/welcome"

layout_toRightOf or layout_toEndOf both works, but to support it better, I used both.

To make it more clear:

This was what I was trying to do:

And this was the emulator's output

Layout:

<TextView
    android:id="@+id/welcome"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginTop="16dp"
    android:text="Welcome "
    android:textSize="16sp" />
<TextView
    android:id="@+id/username"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBaseline="@id/welcome"
    android:layout_toRightOf="@id/welcome"
    android:text="@string/emptyString"
    android:textSize="16sp" />

Notice that:

android:layout_width="wrap_content" works
Gravity is not used

How do I create a new line in Javascript?

Alternatively, write to an element with the CSS white-space: pre and use \n for newline character.

Is there a way to call a stored procedure with Dapper?

With multiple return and multi parameter

string ConnectionString = CommonFunctions.GetConnectionString();
using (IDbConnection conn = new SqlConnection(ConnectionString))
{
    IEnumerable<dynamic> results = conn.Query(sql: "ProductSearch", 
        param: new { CategoryID = 1, SubCategoryID="", PageNumber=1 }, 
        commandType: CommandType.StoredProcedure);.  // single result

    var reader = conn.QueryMultiple("ProductSearch", 
        param: new { CategoryID = 1, SubCategoryID = "", PageNumber = 1 }, 
        commandType: CommandType.StoredProcedure); // multiple result

    var userdetails = reader.Read<dynamic>().ToList(); // instead of dynamic, you can use your objects
    var salarydetails = reader.Read<dynamic>().ToList();
}

public static string GetConnectionString()
{
    // Put the name the Sqlconnection from WebConfig..
    return ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
}

Move / Copy File Operations in Java

Not yet, but the New NIO (JSR 203) will have support for these common operations.

In the meantime, there are a few things to keep in mind.

File.renameTo generally works only on the same file system volume. I think of this as the equivalent to a "mv" command. Use it if you can, but for general copy and move support, you'll need to have a fallback.

When a rename doesn't work you will need to actually copy the file (deleting the original with File.delete if it's a "move" operation). To do this with the greatest efficiency, use the FileChannel.transferTo or FileChannel.transferFrom methods. The implementation is platform specific, but in general, when copying from one file to another, implementations avoid transporting data back and forth between kernel and user space, yielding a big boost in efficiency.

What are sessions? How do they work?

"Session" is the term used to refer to a user's time browsing a web site. It's meant to represent the time between their first arrival at a page in the site until the time they stop using the site. In practice, it's impossible to know when the user is done with the site. In most servers there's a timeout that automatically ends a session unless another page is requested by the same user.

The first time a user connects some kind of session ID is created (how it's done depends on the web server software and the type of authentication/login you're using on the site). Like cookies, this usually doesn't get sent in the URL anymore because it's a security problem. Instead it's stored along with a bunch of other stuff that collectively is also referred to as the session. Session variables are like cookies - they're name-value pairs sent along with a request for a page, and returned with the page from the server - but their names are defined in a web standard.

Some session variables are passed as HTTP headers. They're passed back and forth behind the scenes of every page browse so they don't show up in the browser and tell everybody something that may be private. Among them are the USER_AGENT, or type of browser requesting the page, the REFERRER or the page that linked to the page being requested, etc. Some web server software adds their own headers or transfer additional session data specific to the server software. But the standard ones are pretty well documented.

Hope that helps.

Html attributes for EditorFor() in ASP.NET MVC

Why not just use

@Html.DisplayFor(model => model.Control.PeriodType)

How to redirect to a route in laravel 5 by using href tag if I'm not using blade or any template?

In addition to @chanafdo answer, you can use route name

when working with laravel blade

<a href="{{route('login')}}">login here</a> with parameter in route name

when go to url like URI: profile/{id} <a href="{{route('profile', ['id' => 1])}}">login here</a>

without blade

<a href="<?php echo route('login')?>">login here</a>

with parameter in route name

when go to url like URI: profile/{id} <a href="<?php echo route('profile', ['id' => 1])?>">login here</a>

As of laravel 5.2 you can use @php @endphp to create as <?php ?> in laravel blade. Using blade your personal opinion but I suggest to use it. Learn it. It has many wonderful features as template inheritance, Components & Slots,subviews etc...

iOS: Multi-line UILabel in Auto Layout

Source: http://www.objc.io/issue-3/advanced-auto-layout-toolbox.html

Intrinsic Content Size of Multi-Line Text

The intrinsic content size of UILabel and NSTextField is ambiguous for multi-line text. The height of the text depends on the width of the lines, which is yet to be determined when solving the constraints. In order to solve this problem, both classes have a new property called preferredMaxLayoutWidth, which specifies the maximum line width for calculating the intrinsic content size.

Since we usually don’t know this value in advance, we need to take a two-step approach to get this right. First we let Auto Layout do its work, and then we use the resulting frame in the layout pass to update the preferred maximum width and trigger layout again.

- (void)layoutSubviews
{
    [super layoutSubviews];
    myLabel.preferredMaxLayoutWidth = myLabel.frame.size.width;
    [super layoutSubviews];
}

The first call to [super layoutSubviews] is necessary for the label to get its frame set, while the second call is necessary to update the layout after the change. If we omit the second call we get a NSInternalInconsistencyException error, because we’ve made changes in the layout pass which require updating the constraints, but we didn’t trigger layout again.

We can also do this in a label subclass itself:

@implementation MyLabel
- (void)layoutSubviews
{
    self.preferredMaxLayoutWidth = self.frame.size.width;
    [super layoutSubviews];
}
@end

In this case, we don’t need to call [super layoutSubviews] first, because when layoutSubviews gets called, we already have a frame on the label itself.

To make this adjustment from the view controller level, we hook into viewDidLayoutSubviews. At this point the frames of the first Auto Layout pass are already set and we can use them to set the preferred maximum width.

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];
    myLabel.preferredMaxLayoutWidth = myLabel.frame.size.width;
    [self.view layoutIfNeeded];
}

Lastly, make sure that you don’t have an explicit height constraint on the label that has a higher priority than the label’s content compression resistance priority. Otherwise it will trump the calculated height of the content. Make sure to check all the constraints that can affect label's height.

How to configure Fiddler to listen to localhost?

By simply adding fiddler to the url

http://localhost.fiddler:8081/

Traffic is routed through fiddler and therefore being displayed on fiddler.

What's the best way to get the last element of an array without deleting it?

One way to avoid pass-by-reference errors (eg. "end(array_values($foo))") is to use call_user_func or call_user_func_array:

// PHP Fatal error: Only variables can be passed by reference
// No output (500 server error)
var_dump(end(array(1, 2, 3)));

// No errors, but modifies the array's internal pointer
// Outputs "int(3)"
var_dump(call_user_func('end', array(1, 2, 3)));

// PHP Strict standards:  Only variables should be passed by reference
// Outputs "int(3)"
var_dump(end(array_values(array(1, 2, 3))));

// No errors, doesn't change the array
// Outputs "int(3)"
var_dump(call_user_func('end', array_values(array(1, 2, 3))));

Make a td fixed size (width,height) while rest of td's can expand

This will take care of the empty td:

<td style="min-width: 20px;"></td>

Read Session Id using Javascript

Here's a short and sweet JavaScript function to fetch the session ID:

function session_id() {
    return /SESS\w*ID=([^;]+)/i.test(document.cookie) ? RegExp.$1 : false;
}

Or if you prefer a variable, here's a simple one-liner:

var session_id = /SESS\w*ID=([^;]+)/i.test(document.cookie) ? RegExp.$1 : false;

Should match the session ID cookie for PHP, JSP, .NET, and I suppose various other server-side processors as well.

How to add white spaces in HTML paragraph

You can try it by adding  

Get all unique values in a JavaScript array (remove duplicates)

_x000D_

var numbers = [1, 1, 2, 3, 4, 4];_x000D_
_x000D_
function unique(dupArray) {_x000D_
  return dupArray.reduce(function(previous, num) {_x000D_
_x000D_
    if (previous.find(function(item) {_x000D_
        return item == num;_x000D_
      })) {_x000D_
      return previous;_x000D_
    } else {_x000D_
      previous.push(num);_x000D_
      return previous;_x000D_
    }_x000D_
  }, [])_x000D_
}_x000D_
_x000D_
var check = unique(numbers);_x000D_
console.log(check);

_x000D_

PHP get and set magic methods

I'd recommend to use an array for storing all values via __set().

class foo {

    protected $values = array();

    public function __get( $key )
    {
        return $this->values[ $key ];
    }

    public function __set( $key, $value )
    {
        $this->values[ $key ] = $value;
    }

}

This way you make sure, that you can't access the variables in another way (note that $values is protected), to avoid collisions.

jQuery - Follow the cursor with a DIV

This works for me. Has a nice delayed action going on.

var $mouseX = 0, $mouseY = 0;
var $xp = 0, $yp =0;

$(document).mousemove(function(e){
    $mouseX = e.pageX;
    $mouseY = e.pageY;    
});

var $loop = setInterval(function(){
// change 12 to alter damping higher is slower
$xp += (($mouseX - $xp)/12);
$yp += (($mouseY - $yp)/12);
$("#moving_div").css({left:$xp +'px', top:$yp +'px'});  
}, 30);

Nice and simples

Split and join C# string

Well, here is my "answer". It uses the fact that String.Split can be told hold many items it should split to (which I found lacking in the other answers):

string theString = "Some Very Large String Here";
var array = theString.Split(new [] { ' ' }, 2); // return at most 2 parts
// note: be sure to check it's not an empty array
string firstElem = array[0];
// note: be sure to check length first
string restOfArray = array[1];

This is very similar to the Substring method, just by a different means.

Send FormData and String Data Together Through JQuery AJAX?

var fd = new FormData();
var file_data = $('input[type="file"]')[0].files; // for multiple files
for(var i = 0;i<file_data.length;i++){
    fd.append("file_"+i, file_data[i]);
}
var other_data = $('form').serializeArray();
$.each(other_data,function(key,input){
    fd.append(input.name,input.value);
});
$.ajax({
    url: 'test.php',
    data: fd,
    contentType: false,
    processData: false,
    type: 'POST',
    success: function(data){
        console.log(data);
    }
});

Added a for loop and changed .serialize() to .serializeArray() for object reference in a .each() to append to the FormData.

Java string split with "." (dot)

This is because . is a reserved character in regular expression, representing any character. Instead, we should use the following statement:

String extensionRemoved = filename.split("\\.")[0];

How to generate UML diagrams (especially sequence diagrams) from Java code?

What is your codebase? Java or C++?

eUML2 for Java is a powerful UML modeler designed for Java developper in Eclipse. The free edition can be used for commercial use. It supports the following features:

CVS and Team Support

Designed for large project with multiple and customizable model views

Helios Compliant

Real-time code/model synchronization

UML2.1 compliant and support of OMG XMI

JDK 1.4 and 1.5 support

The commercial edition provides:

Advanced reversed engineering

Powerful true dependency analyze tools

UML Profile and MDD

Database tools

Customizable template support

How to change the font size and color of x-axis and y-axis label in a scatterplot with plot function in R?

Taking DWins example.

What I often do, particularly when I use many, many different plots with the same colours or size information, is I store them in variables I otherwise never use. This helps me keep my code a little cleaner AND I can change it "globally".

E.g.

clab = 1.5
cmain = 2
caxis = 1.2

plot(1, 1 ,xlab="x axis", ylab="y axis",  pch=19,
           col.lab="red", cex.lab=clab,    
           col="green", main = "Testing scatterplots", cex.main =cmain, cex.axis=caxis)

You can also write a function, doing something similar. But for a quick shot this is ideal. You can also store that kind of information in an extra script, so you don't have a messy plot script:

which you then call with setwd("") source("plotcolours.r")

in a file say called plotcolours.r you then store all the e.g. colour or size variables

clab = 1.5
cmain = 2
caxis = 1.2

for colours could use

darkred<-rgb(113,28,47,maxColorValue=255)

as your variable 'darkred' now has the colour information stored, you can access it in your actual plotting script.

plot(1,1,col=darkred)

Have a variable in images path in Sass?

Adding something to the above correct answers. I am using netbeans IDE and it shows error while using url(#{$assetPath}/site/background.jpg) this method. It was just netbeans error and no error in sass compiling. But this error break code formatting in netbeans and code become ugly. But when I use it inside quotes like below, it show wonder!

url("#{$assetPath}/site/background.jpg")

Aren't Python strings immutable? Then why does a + " " + b work?

Python strings are immutable. However, a is not a string: it is a variable with a string value. You can't mutate the string, but can change what value of the variable to a new string.

How to save local data in a Swift app?

For Swift 3

UserDefaults.standard.setValue(token, forKey: "user_auth_token")
print("\(UserDefaults.standard.value(forKey: "user_auth_token")!)")

MySQL SELECT only not null values

Following query working for me

when i have set default value of column 'NULL' then

select * from table where column IS NOT NULL

and when i have set default value nothing then

select * from table where column <>''

How to store JSON object in SQLite database

An alternative could be to use the new JSON extension for SQLite. I've only just come across this myself: https://www.sqlite.org/json1.html This would allow you to perform a certain level of querying the stored JSON. If you used VARCHAR or TEXT to store a JSON string you would have no ability to query it. This is a great article showing its usage (in python) http://charlesleifer.com/blog/using-the-sqlite-json1-and-fts5-extensions-with-python/

Javascript to check whether a checkbox is being checked or unchecked

The value attribute of a checkbox is what you set by:

<input type='checkbox' name='test' value='1'>

So when someone checks that box, the server receives a variable named test with a value of 1 - what you want to check for is not the value of it (which will never change, whether it is checked or not) but the checked status of the checkbox.

So, if you replace this code:

if (arrChecks[i].value == "on") 
{
    arrChecks[i].checked = 1;
} else {
    arrChecks[i].checked = 0;
}

With this:

arrChecks[i].checked = !arrChecks[i].checked;

It should work. You should use true and false instead of 0 and 1 for this.

Working copy XXX locked and cleanup failed in SVN

I had this under TortoiseSVN and the error was related to a new directory I'd created under a new project. I had just created this project, so there was no way this directory had existed before. I looked in the repository browser and the new folder was indeed already in the repository, but TortoiseSVN didn't show it as committed.

In order to get around it, since I'd just created the folder anyway, I deleted it in the repository, and then did a commit. It worked fine.

Since I did this outside of Visual Studio, I then had to restart Visual Studio for it to figure everything out again.

Why can't I use the 'await' operator within the body of a lock statement?

I did try using a Monitor (code below) which appears to work but has a GOTCHA... when you have multiple threads it will give... System.Threading.SynchronizationLockException Object synchronization method was called from an unsynchronized block of code.

using System;
using System.Threading;
using System.Threading.Tasks;

namespace MyNamespace
{
    public class ThreadsafeFooModifier : 
    {
        private readonly object _lockObject;

        public async Task<FooResponse> ModifyFooAsync()
        {
            FooResponse result;
            Monitor.Enter(_lockObject);
            try
            {
                result = await SomeFunctionToModifyFooAsync();
            }
            finally
            {
                Monitor.Exit(_lockObject);
            }
            return result;
        }
    }
}

Prior to this I was simply doing this, but it was in an ASP.NET controller so it resulted in a deadlock.

public async Task<FooResponse> ModifyFooAsync() { lock(lockObject) { return SomeFunctionToModifyFooAsync.Result; } }

"register" keyword in C?

On supported C compilers it tries to optimize the code so that variable's value is held in an actual processor register.

How to create a dialog with “yes” and “no” options?

How to split elements of a list?

myList = [i.split('\t')[0] for i in myList]

How to set a binding in Code?

You need to change source to viewmodel object:

myBinding.Source = viewModelObject;

How to use paginator from material angular?

Hey so I stumbled upon this and got it working, here is how:

inside my component.html

<mat-paginator #paginator [pageSize]="pageSize" [pageSizeOptions]="[5, 10, 20]" [showFirstLastButtons]="true" [length]="totalSize"
    [pageIndex]="currentPage" (page)="pageEvent = handlePage($event)">
</mat-paginator>

Inside my component.ts

public array: any;
public displayedColumns = ['', '', '', '', ''];
public dataSource: any;    

public pageSize = 10;
public currentPage = 0;
public totalSize = 0;

@ViewChild(MatPaginator) paginator: MatPaginator;

constructor(private app: AppService) { }

ngOnInit() {
  this.getArray();
}

public handlePage(e: any) {
  this.currentPage = e.pageIndex;
  this.pageSize = e.pageSize;
  this.iterator();
}

private getArray() {
  this.app.getDeliveries()
    .subscribe((response) => {
      this.dataSource = new MatTableDataSource<Element>(response);
      this.dataSource.paginator = this.paginator;
      this.array = response;
      this.totalSize = this.array.length;
      this.iterator();
    });
}

private iterator() {
  const end = (this.currentPage + 1) * this.pageSize;
  const start = this.currentPage * this.pageSize;
  const part = this.array.slice(start, end);
  this.dataSource = part;
}

All the paging work is done from within the iterator method. This method works out the skip and take and assigns that to the dataSource for the Material table.

How to match hyphens with Regular Expression?

The hyphen is usually a normal character in regular expressions. Only if it’s in a character class and between two other characters does it take a special meaning.

Thus:

[-] matches a hyphen.
[abc-] matches a, b, c or a hyphen.
[-abc] matches a, b, c or a hyphen.
[ab-d] matches a, b, c or d (only here the hyphen denotes a character range).

SQL: Combine Select count(*) from multiple tables

SELECT 
(select count(*) from foo1 where ID = '00123244552000258')
+
(select count(*) from foo2 where ID = '00123244552000258')
+
(select count(*) from foo3 where ID = '00123244552000258')

This is an easy way.

How to print a groupby object

In python 3

k = None
for name_of_the_group, group in dict(df_group):
    if(k != name_of_the_group):
        print ('\n', name_of_the_group)
        print('..........','\n')
    print (group)
    k = name_of_the_group

In more interactive way

How to dynamically add a class to manual class names?

try this using hooks:

const [dynamicClasses, setDynamicClasses] = React.useState([
    "dynamicClass1", "dynamicClass2"
]);

and add this in className attribute :

<div className=`wrapper searchDiv ${[...dynamicClasses]}`>
...
</div>

to add class :

    const addClass = newClass => {
       setDynamicClasses([...dynamicClasses, newClass])
    }

to delete class :

        const deleteClass= classToDelete => {

           setDynamicClasses(dynamicClasses.filter(class = > {
             class !== classToDelete
           }));

        }

How to create a thread?

Update The currently suggested way to start a Task is simply using Task.Run()

Task.Run(() => foo());

Note that this method is described as the best way to start a task see here

Previous answer

I like the Task Factory from System.Threading.Tasks. You can do something like this:

Task.Factory.StartNew(() => 
{
    // Whatever code you want in your thread
});

Note that the task factory gives you additional convenience options like ContinueWith:

Task.Factory.StartNew(() => {}).ContinueWith((result) => 
{
    // Whatever code should be executed after the newly started thread.
});

Also note that a task is a slightly different concept than threads. They nicely fit with the async/await keywords, see here.

How to use @Nullable and @Nonnull annotations more effectively?

If you use Kotlin, it supports these nullability annotations in its compiler and will prevent you from passing a null to a java method that requires a non-null argument. Event though this question was originally targeted at Java, I mention this Kotlin feature because it is specifically targeted at these Java annotation and the question was "Is there a way to make these annotations more strictly enforced and/or propagate further?" and this feature does make these annotation more strictly enforced.

Java class using @NotNull annotation

public class MyJavaClazz {
    public void foo(@NotNull String myString) {
        // will result in an NPE if myString is null
        myString.hashCode();
    }
}

Kotlin class calling Java class and passing null for the argument annotated with @NotNull

class MyKotlinClazz {
    fun foo() {
        MyJavaClazz().foo(null)
    }
}

Kotlin compiler error enforcing the @NotNull annotation.

Error:(5, 27) Kotlin: Null can not be a value of a non-null type String

see: http://kotlinlang.org/docs/reference/java-interop.html#nullability-annotations

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'

This warning also appears if you are using the log4jdbc-spring-boot-starter library directly.

However there is a config to choose the correct driver yourself. Put this in your application.properties:

log4jdbc.drivers=com.mysql.cj.jdbc.Driver
log4jdbc.auto.load.popular.drivers=false

See documentation on Github

What's the best way to add a full screen background image in React Native

You can also use your image as a container:

render() {
    return (
        <Image
            source={require('./images/background.png')}
            style={styles.container}>
            <Text>
              This text will be on top of the image
            </Text>
        </Image>
    );
}


const styles = StyleSheet.create({
    container: {
        flex: 1,
        width: undefined,
        height: undefined,
        justifyContent: 'center',
        alignItems: 'center',
      },
});

Remove white space below image

You're seeing the space for descenders (the bits that hang off the bottom of 'y' and 'p') because img is an inline element by default. This removes the gap:

.youtube-thumb img { display: block; }

Best programming based games

If you want to step away from your keyboard, Wizards of the Coast relased a game called RoboRally that is a combative programming board game.

http://www.wizards.com/roborally/

"for line in..." results in UnicodeDecodeError: 'utf-8' codec can't decode byte

The following also worked for me. ISO 8859-1 is going to save a lot, hahaha - mainly if using Speech Recognition APIs.

Example:

file = open('../Resources/' + filename, 'r', encoding="ISO-8859-1");

How do I sort a list of datetime or date objects?

You're getting None because list.sort() it operates in-place, meaning that it doesn't return anything, but modifies the list itself. You only need to call a.sort() without assigning it to a again.

There is a built in function sorted(), which returns a sorted version of the list - a = sorted(a) will do what you want as well.

How to evaluate http response codes from bash/shell script?

Another variation:

       status=$(curl -sS  -I https://www.healthdata.gov/user/login  2> /dev/null | head -n 1 | cut -d' ' -f2)
status_w_desc=$(curl -sS  -I https://www.healthdata.gov/user/login  2> /dev/null | head -n 1 | cut -d' ' -f2-)

Adding additional data to select options using jQuery

To me, it sounds like you want to create a new attribute? Do you want

<option value="2" value2="somethingElse">...

To do this, you can do

$(your selector).attr('value2', 'the value');

And then to retrieve it, you can use

$(your selector).attr('value2')

It's not going to be valid code, but I guess it does the job.

Ignore Typescript Errors "property does not exist on value of type"

When TypeScript thinks that property "x" does not exist on "y", then you can always cast "y" into "any", which will allow you to call anything (like "x") on "y".

Theory

(<any>y).x;

Real World Example

I was getting the error "TS2339: Property 'name' does not exist on type 'Function'" for this code:

let name: string = this.constructor.name;

So I fixed it with:

let name: string = (<any>this).constructor.name;

How can I shuffle the lines of a text file on the Unix command line or in a shell script?

Simple awk-based function will do the job:

shuffle() { 
    awk 'BEGIN{srand();} {printf "%06d %s\n", rand()*1000000, $0;}' | sort -n | cut -c8-
}

usage:

any_command | shuffle

This should work on almost any UNIX. Tested on Linux, Solaris and HP-UX.

Update:

Note, that leading zeros (%06d) and rand() multiplication makes it to work properly also on systems where sort does not understand numbers. It can be sorted via lexicographical order (a.k.a. normal string compare).

Symfony2 Setting a default choice field selection

I think you should simply use $breed->setSpecies($species), for instance in my form I have:

$m = new Member();
$m->setBirthDate(new \DateTime);
$form = $this->createForm(new MemberType, $m);

and that sets my default selection to the current date. Should work the same way for external entities...

Reason: no suitable image found

Cited from Technical Q&A QA1886:

Swift app crashes when trying to reference Swift library libswiftCore.dylib.

Q: What can I do about the libswiftCore.dylib loading error in my device's console that happens when I try to run my Swift language app?

A: To correct this problem, you will need to sign your app using code signing certificates with the Subject Organizational Unit (OU) set to your Team ID. All Enterprise and standard iOS developer certificates that are created after iOS 8 was released have the new Team ID field in the proper place to allow Swift language apps to run.

Usually this error appears in the device's console log with a message similar to one of the following: [....] [deny-mmap] mapped file has no team identifier and is not a platform binary: /private/var/mobile/Containers/Bundle/Application/5D8FB2F7-1083-4564-94B2-0CB7DC75C9D1/YourAppNameHere.app/Frameworks/libswiftCore.dylib

Dyld Error Message:
  Library not loaded: @rpath/libswiftCore.dylib

Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000120021088
Triggered by Thread: 0

Referenced from: /private/var/mobile/Containers/Bundle/Application/C3DCD586-2A40-4C7C-AA2B-64EDAE8339E2/TestApp.app/TestApp
Reason: no suitable image found. Did find:
/private/var/mobile/Containers/Bundle/Application/C3DCD586-2A40-4C7C-AA2B-64EDAE8339E2/TestApp.app/Frameworks/libswiftCore.dylib: mmap() error 1 at address=0x1001D8000, size=0x00194000 segment=__TEXT in Segment::map() mapping /private/var/mobile/Containers/Bundle/Application/C3DCD586-2A40-4C7C-AA2B-64EDAE8339E2/TestApp.app/Frameworks/libswiftCore.dylib
Dyld Version: 353.5

The new certificates are needed when building an archive and packaging your app. Even if you have one of the new certificates, just resigning an existing swift app archive won’t work. If it was built with a pre-iOS 8 certificate, you will need to build another archive.

Important: Please use caution if you need to revoke and setup up a new Enterprise Distribution certificate. If you are an in-house Enterprise developer you will need to be careful that you do not revoke a distribution certificate that was used to sign an app any one of your Enterprise employees is still using as any apps that were signed with that enterprise distribution certificate will stop working immediately. The above only applies to Enterprise Distribution certificates. Development certs are safe to revoke for enterprise/standard iOS developers.

As the AirSign guys state the problem roots from the missing OU attribute in the subject field of the In-House certificate.

Subject: UID=269J2W3P2L, CN=iPhone Distribution: Company Name, OU=269J2W3P2L, O=Company Name, C=FR

I have an enterprise development certificate, creating a new one solved the issue.

GCM with PHP (Google Cloud Messaging)

<?php
    // Replace with the real server API key from Google APIs
    $apiKey = "your api key";

    // Replace with the real client registration IDs
    $registrationIDs = array( "reg id1","reg id2");

    // Message to be sent
    $message = "hi Shailesh";

    // Set POST variables
    $url = 'https://android.googleapis.com/gcm/send';

    $fields = array(
        'registration_ids' => $registrationIDs,
        'data' => array( "message" => $message ),
    );
    $headers = array(
        'Authorization: key=' . $apiKey,
        'Content-Type: application/json'
    );

    // Open connection
    $ch = curl_init();

    // Set the URL, number of POST vars, POST data
    curl_setopt( $ch, CURLOPT_URL, $url);
    curl_setopt( $ch, CURLOPT_POST, true);
    curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true);
    //curl_setopt( $ch, CURLOPT_POSTFIELDS, json_encode( $fields));

    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    // curl_setopt($ch, CURLOPT_POST, true);
    // curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode( $fields));

    // Execute post
    $result = curl_exec($ch);

    // Close connection
    curl_close($ch);
    echo $result;
    //print_r($result);
    //var_dump($result);
?>

How to pass data from Javascript to PHP and vice versa?

There's a few ways, the most prominent being getting form data, or getting the query string. Here's one method using JavaScript. When you click on a link it will call the _vals('mytarget', 'theval') which will submit the form data. When your page posts back you can check if this form data has been set and then retrieve it from the form values.

<script language="javascript" type="text/javascript">
 function _vals(target, value){
   form1.all("target").value=target;
   form1.all("value").value=value;
   form1.submit();
 }
</script>

Alternatively you can get it via the query string. PHP has your _GET and _SET global functions to achieve this making it much easier.

I'm sure there's probably more methods which are better, but these are just a few that spring to mind.

EDIT: Building on this from what others have said using the above method you would have an anchor tag like

<a onclick="_vals('name', 'val')" href="#">My Link</a>

And then in your PHP you can get form data using

$val = $_POST['value'];

So when you click on the link which uses JavaScript it will post form data and when the page posts back from this click you can then retrieve it from the PHP.

How to add a right button to a UINavigationController?

Here is the solution in Swift (set options as needed):

var optionButton = UIBarButtonItem()
optionButton.title = "Settings"
//optionButton.action = something (put your action here)
self.navigationItem.rightBarButtonItem = optionButton

jQuery: Change button text on click

try this, this javascript code to change text all time to click button.http://jsfiddle.net/V4u5X/2/

html code

<button class="SeeMore2">See More</button>

javascript

$('.SeeMore2').click(function(){
        var $this = $(this);
        $this.toggleClass('SeeMore2');
        if($this.hasClass('SeeMore2')){
            $this.text('See More');         
        } else {
            $this.text('See Less');
        }
    });

NLS_NUMERIC_CHARACTERS setting for decimal

You can see your current session settings by querying nls_session_parameters:

select value
from nls_session_parameters
where parameter = 'NLS_NUMERIC_CHARACTERS';

VALUE                                  
----------------------------------------
.,

That may differ from the database defaults, which you can see in nls_database_parameters.

In this session your query errors:

select to_number('100,12') from dual;

Error report -
SQL Error: ORA-01722: invalid number
01722. 00000 -  "invalid number"

I could alter my session, either directly with alter session or by ensuring my client is configured in a way that leads to the setting the string needs (it may be inherited from a operating system or Java locale, for example):

alter session set NLS_NUMERIC_CHARACTERS = ',.';
select to_number('100,12') from dual;

TO_NUMBER('100,12')
-------------------
             100,12

In SQL Developer you can set your preferred value in Tool->Preferences->Database->NLS.

But I can also override that session setting as part of the query, with the optional third nlsparam parameter to to_number(); though that makes the optional second fmt parameter necessary as well, so you'd need to be able pick a suitable format:

alter session set NLS_NUMERIC_CHARACTERS = '.,';
select to_number('100,12', '99999D99', 'NLS_NUMERIC_CHARACTERS='',.''')
from dual;

TO_NUMBER('100,12','99999D99','NLS_NUMERIC_CHARACTERS='',.''')
--------------------------------------------------------------
                                                        100.12

By default the result is still displayed with my session settings, so the decimal separator is still a period.

Create Log File in Powershell

Put this at the top of your file:

$Logfile = "D:\Apps\Logs\$(gc env:computername).log"

Function LogWrite
{
   Param ([string]$logstring)

   Add-content $Logfile -value $logstring
}

Then replace your Write-host calls with LogWrite.

How do I loop through a date range?

@jacob-sobus and @mquander and @Yogurt not exactly correct.. If I need the next day I wait 00:00 time mostly

    public static IEnumerable<DateTime> EachDay(DateTime from, DateTime thru)
    {
        for (var day = from.Date; day.Date <= thru.Date; day = day.NextDay())
            yield return day;
    }

    public static IEnumerable<DateTime> EachMonth(DateTime from, DateTime thru)
    {
        for (var month = from.Date; month.Date <= thru.Date || month.Year == thru.Year && month.Month == thru.Month; month = month.NextMonth())
            yield return month;
    }

    public static IEnumerable<DateTime> EachYear(DateTime from, DateTime thru)
    {
        for (var year = from.Date; year.Date <= thru.Date || year.Year == thru.Year; year = year.NextYear())
            yield return year;
    }

    public static DateTime NextDay(this DateTime date)
    {
        return date.AddTicks(TimeSpan.TicksPerDay - date.TimeOfDay.Ticks);
    }

    public static DateTime NextMonth(this DateTime date)
    {
        return date.AddTicks(TimeSpan.TicksPerDay * DateTime.DaysInMonth(date.Year, date.Month) - (date.TimeOfDay.Ticks + TimeSpan.TicksPerDay * (date.Day - 1)));
    }

    public static DateTime NextYear(this DateTime date)
    {
        var yearTicks = (new DateTime(date.Year + 1, 1, 1) - new DateTime(date.Year, 1, 1)).Ticks;
        var ticks = (date - new DateTime(date.Year, 1, 1)).Ticks;
        return date.AddTicks(yearTicks - ticks);
    }

    public static IEnumerable<DateTime> EachDayTo(this DateTime dateFrom, DateTime dateTo)
    {
        return EachDay(dateFrom, dateTo);
    }

    public static IEnumerable<DateTime> EachMonthTo(this DateTime dateFrom, DateTime dateTo)
    {
        return EachMonth(dateFrom, dateTo);
    }

    public static IEnumerable<DateTime> EachYearTo(this DateTime dateFrom, DateTime dateTo)
    {
        return EachYear(dateFrom, dateTo);
    }

What are the rules for casting pointers in C?

When thinking about pointers, it helps to draw diagrams. A pointer is an arrow that points to an address in memory, with a label indicating the type of the value. The address indicates where to look and the type indicates what to take. Casting the pointer changes the label on the arrow but not where the arrow points.

d in main is a pointer to c which is of type char. A char is one byte of memory, so when d is dereferenced, you get the value in that one byte of memory. In the diagram below, each cell represents one byte.

-+----+----+----+----+----+----+-
 |    | c  |    |    |    |    | 
-+----+----+----+----+----+----+-
       ^~~~
       | char
       d

When you cast d to int*, you're saying that d really points to an int value. On most systems today, an int occupies 4 bytes.

-+----+----+----+----+----+----+-
 |    | c  | ?1 | ?2 | ?3 |    | 
-+----+----+----+----+----+----+-
       ^~~~~~~~~~~~~~~~~~~
       | int
       (int*)d

When you dereference (int*)d, you get a value that is determined from these four bytes of memory. The value you get depends on what is in these cells marked ?, and on how an int is represented in memory.

A PC is little-endian, which means that the value of an int is calculated this way (assuming that it spans 4 bytes): * ((int*)d) == c + ?1 * 28 + ?2 * 2¹6 + ?3 * 2²4. So you'll see that while the value is garbage, if you print in in hexadecimal (printf("%x\n", *n)), the last two digits will always be 35 (that's the value of the character '5').

Some other systems are big-endian and arrange the bytes in the other direction: * ((int*)d) == c * 2²4 + ?1 * 2¹6 + ?2 * 28 + ?3. On these systems, you'd find that the value always starts with 35 when printed in hexadecimal. Some systems have a size of int that's different from 4 bytes. A rare few systems arrange int in different ways but you're extremely unlikely to encounter them.

Depending on your compiler and operating system, you may find that the value is different every time you run the program, or that it's always the same but changes when you make even minor tweaks to the source code.

On some systems, an int value must be stored in an address that's a multiple of 4 (or 2, or 8). This is called an alignment requirement. Depending on whether the address of c happens to be properly aligned or not, the program may crash.

In contrast with your program, here's what happens when you have an int value and take a pointer to it.

int x = 42;
int *p = &x;

-+----+----+----+----+----+----+-
 |    |         x         |    | 
-+----+----+----+----+----+----+-
       ^~~~~~~~~~~~~~~~~~~
       | int
       p

The pointer p points to an int value. The label on the arrow correctly describes what's in the memory cell, so there are no surprises when dereferencing it.

How to sort two lists (which reference each other) in the exact same way

Schwartzian transform. The built-in Python sorting is stable, so the two 1s don't cause a problem.

>>> l1 = [3, 2, 4, 1, 1]
>>> l2 = ['three', 'two', 'four', 'one', 'second one']
>>> zip(*sorted(zip(l1, l2)))
[(1, 1, 2, 3, 4), ('one', 'second one', 'two', 'three', 'four')]

How to set the height and the width of a textfield in Java?

What type of LayoutManager are you using for the panel you're adding the JTextField to?

Different layout managers approach sizing elements on them in different ways, some respect SetPreferredSize(), while others will scale the compoenents to fit their container.

See: http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html

ps. this has nothing to do with eclipse, its java.

Tensorflow image reading & display

I used CIFAR10 format instead of STL10 and code came out like

filename_queue = tf.train.string_input_producer(filenames)
read_input = read_cifar10(filename_queue)
with tf.Session() as sess:       
    tf.train.start_queue_runners(sess=sess)
    result = sess.run(read_input.uint8image)        
img = Image.fromarray(result, "RGB")    
img.save('my.jpg')

The snippet is identical with mttk and Rosa Gronchi, but Somehow I wasn't able to show the image during run-time, so I saved as the JPG file.

What does it mean if a Python object is "subscriptable" or not?

As a corollary to the earlier answers here, very often this is a sign that you think you have a list (or dict, or other subscriptable object) when you do not.

For example, let's say you have a function which should return a list;

def gimme_things():
    if something_happens():
        return ['all', 'the', 'things']

Now when you call that function, and something_happens() for some reason does not return a True value, what happens? The if fails, and so you fall through; gimme_things doesn't explicitly return anything -- so then in fact, it will implicitly return None. Then this code:

things = gimme_things()
print("My first thing is {0}".format(things[0]))

will fail with "NoneType object is not subscriptable" because, well, things is None and so you are trying to do None[0] which doesn't make sense because ... what the error message says.

There are two ways to fix this bug in your code -- the first is to avoid the error by checking that things is in fact valid before attempting to use it;

things = gimme_things()
if things:
    print("My first thing is {0}".format(things[0]))
else:
    print("No things")  # or raise an error, or do nothing, or ...

or equivalently trap the TypeError exception;

things = gimme_things()
try:
    print("My first thing is {0}".format(things[0]))
except TypeError:
    print("No things")  # or raise an error, or do nothing, or ...

Another is to redesign gimme_things so that you make sure it always returns a list. In this case, that's probably the simpler design because it means if there are many places where you have a similar bug, they can be kept simple and idiomatic.

def gimme_things():
    if something_happens():
        return ['all', 'the', 'things']
    else:  # make sure we always return a list, no matter what!
        logging.info("Something didn't happen; return empty list")
        return []

Of course, what you put in the else: branch depends on your use case. Perhaps you should raise an exception when something_happens() fails, to make it more obvious and explicit where something actually went wrong? Adding exceptions to your own code is an important way to let yourself know exactly what's up when something fails!

(Notice also how this latter fix still doesn't completely fix the bug -- it prevents you from attempting to subscript None but things[0] is still an IndexError when things is an empty list. If you have a try you can do except (TypeError, IndexError) to trap it, too.)

What's the difference between Invoke() and BeginInvoke()

The difference between Control.Invoke() and Control.BeginInvoke() is,

BeginInvoke() will schedule the asynchronous action on the GUI thread. When the asynchronous action is scheduled, your code continues. Some time later (you don't know exactly when) your asynchronous action will be executed
Invoke() will execute your asynchronous action (on the GUI thread) and wait until your action has completed.

A logical conclusion is that a delegate you pass to Invoke() can have out-parameters or a return-value, while a delegate you pass to BeginInvoke() cannot (you have to use EndInvoke to retrieve the results).

How to refresh Android listview?

if you are not still satisfied with ListView Refreshment, you can look at this snippet,this is for loading the listView from DB, Actually what you have to do is simply reload the ListView,after you perform any CRUD Operation Its not a best way to code, but it will refresh the ListView as you wish..

It works for Me....if u find better solution,please Share...

.......
......
do your CRUD Operations..
......
.....
DBAdapter.open();
DBAdapter.insert_into_SingleList();
// Bring that DB_results and add it to list as its contents....
                                            ls2.setAdapter(new ArrayAdapter(DynTABSample.this,
    android.R.layout.simple_list_item_1,                        DBAdapter.DB_ListView));
                                            DBAdapter.close();

Query EC2 tags from within instance

The following bash script returns the Name of your current ec2 instance (the value of the "Name" tag). Modify TAG_NAME to your specific case.

TAG_NAME="Name"
INSTANCE_ID="`wget -qO- http://instance-data/latest/meta-data/instance-id`"
REGION="`wget -qO- http://instance-data/latest/meta-data/placement/availability-zone | sed -e 's:\([0-9][0-9]*\)[a-z]*\$:\\1:'`"
TAG_VALUE="`aws ec2 describe-tags --filters "Name=resource-id,Values=$INSTANCE_ID" "Name=key,Values=$TAG_NAME" --region $REGION --output=text | cut -f5`"

To install the aws cli

sudo apt-get install python-pip -y
sudo pip install awscli

In case you use IAM instead of explicit credentials, use these IAM permissions:

{
  "Version": "2012-10-17",
  "Statement": [
    {    
      "Effect": "Allow",
      "Action": [ "ec2:DescribeTags"],
      "Resource": ["*"]
    }
  ]
}

What's the most efficient way to test two integer ranges for overlap?

Think in the inverse way: how to make the 2 ranges not overlap? Given [x1, x2], then [y1, y2] should be outside [x1, x2], i.e., y1 < y2 < x1 or x2 < y1 < y2 which is equivalent to y2 < x1 or x2 < y1.

Therefore, the condition to make the 2 ranges overlap: not(y2 < x1 or x2 < y1), which is equivalent to y2 >= x1 and x2 >= y1 (same with the accepted answer by Simon).

Java - Convert image to Base64

new String(byteArray, 0, bytesRead); does not modify the array. You need to use System.arrayCopy to trim the array to the actual data size. Otherwise you are processing all 102400 bytes most of which are zeros.

jQuery changing css class to div

$(document).ready(function () {

            $("#divId").toggleClass('cssclassname'); // toggle class
});

**OR**

$(document).ready(function() {
        $("#objectId").click(function() {  // click or other event to change the div class
                $("#divId").toggleClass("cssclassname");     // toggle class
        )}; 
)};

String.equals() with multiple conditions (and one action on result)

No,its check like if string is "john" OR "mary" OR "peter" OR "etc."

you should check using ||

Like.,,if(str.equals("john") || str.equals("mary") || str.equals("peter"))

HTML radio buttons allowing multiple selections

To the radio buttons works correctly, you must to have grouped by his name. (Ex. name="type")

 <fieldset>
    <legend>Please select one of the following</legend>
    <input type="radio" name="type" id="track" value="track" /><label for="track">Track Submission</label><br />
    <input type="radio" name="type" id="event" value="event"  /><label for="event">Events and Artist booking</label><br />
    <input type="radio" name="type" id="message" value="message" /><label for="message">Message us</label><br />

It will returns the value of the radio button checked (Ex. track | event | message)

AddTransient, AddScoped and AddSingleton Services Differences

Which one to use

Transient

since they are created every time they will use more memory & Resources and can have the negative impact on performance
use this for the lightweight service with little or no state.

Scoped

better option when you want to maintain state within a request.

Singleton

memory leaks in these services will build up over time.
also memory efficient as they are created once reused everywhere.

Use Singletons where you need to maintain application wide state. Application configuration or parameters, Logging Service, caching of data is some of the examples where you can use singletons.

Injecting service with different lifetimes into another

Never inject Scoped & Transient services into Singleton service. ( This effectively converts the transient or scoped service into the singleton.)
Never inject Transient services into scoped service ( This converts the transient service into the scoped. )

Import CSV to mysql table

Instead of writing a script to pull in information from a CSV file, you can link MYSQL directly to it and upload the information using the following SQL syntax.

To import an Excel file into MySQL, first export it as a CSV file. Remove the CSV headers from the generated CSV file along with empty data that Excel may have put at the end of the CSV file.

You can then import it into a MySQL table by running:

load data local infile 'uniq.csv' into table tblUniq fields terminated by ','
  enclosed by '"'
  lines terminated by '\n'
    (uniqName, uniqCity, uniqComments)

as read on: Import CSV file directly into MySQL

EDIT

For your case, you'll need to write an interpreter first, for finding the first row, and assigning them as column names.

EDIT-2

From MySQL docs on LOAD DATA syntax:

The IGNORE number LINES option can be used to ignore lines at the start of the file. For example, you can use IGNORE 1 LINES to skip over an initial header line containing column names:
LOAD DATA INFILE '/tmp/test.txt' INTO TABLE test IGNORE 1 LINES;

Therefore, you can use the following statement:

LOAD DATA LOCAL INFILE 'uniq.csv'
INTO TABLE tblUniq
FIELDS TERMINATED BY ','
    ENCLOSED BY '"'
LINES TERMINATED BY '\n'
IGNORE 1 LINES
(uniqName, uniqCity, uniqComments)

How do I increase the contrast of an image in Python OpenCV

I would like to suggest a method using the LAB color channel. Wikipedia has enough information regarding what the LAB color channel is about.

I have done the following using OpenCV 3.0.0 and python:

import cv2

#-----Reading the image-----------------------------------------------------
img = cv2.imread('Dog.jpg', 1)
cv2.imshow("img",img) 

#-----Converting image to LAB Color model----------------------------------- 
lab= cv2.cvtColor(img, cv2.COLOR_BGR2LAB)
cv2.imshow("lab",lab)

#-----Splitting the LAB image to different channels-------------------------
l, a, b = cv2.split(lab)
cv2.imshow('l_channel', l)
cv2.imshow('a_channel', a)
cv2.imshow('b_channel', b)

#-----Applying CLAHE to L-channel-------------------------------------------
clahe = cv2.createCLAHE(clipLimit=3.0, tileGridSize=(8,8))
cl = clahe.apply(l)
cv2.imshow('CLAHE output', cl)

#-----Merge the CLAHE enhanced L-channel with the a and b channel-----------
limg = cv2.merge((cl,a,b))
cv2.imshow('limg', limg)

#-----Converting image from LAB Color model to RGB model--------------------
final = cv2.cvtColor(limg, cv2.COLOR_LAB2BGR)
cv2.imshow('final', final)

#_____END_____#

You can run the code as it is. To know what CLAHE (Contrast Limited Adaptive Histogram Equalization)is about, you can again check Wikipedia.

How can I run a program from a batch file without leaving the console open after the program starts?

You should try this. It starts the program with no window. It actually flashes up for a second but goes away fairly quickly.

start "name" /B myprogram.exe param1

Where does Jenkins store configuration files for the jobs it runs?

The best approach would be to keep your job configurations in a Jenkinsfile that live in source control.

How to Set Selected value in Multi-Value Select in Jquery-Select2.?

Using select2 library there are 2 ways to set the value 1. when single value is present you can pass it as string

$("#elementid").select2("val","valueTobeset")

2. when you are using select2 with multiselect option you can pass an array of the values to select2 and all those values will be set

var arrayOfValues = ["a","c"]
$("#elementid").select2("val",arrayOfValues)

remember that you can set single value on multiselect by passing an array also like this

var arrayOfValues = ["a"]
$("#elementid").select2("val",arrayOfValues)

Create patch or diff file from git repository and apply it to another different git repository

You can just use git diff to produce a unified diff suitable for git apply:

git diff tag1..tag2 > mypatch.patch

You can then apply the resulting patch with:

git apply mypatch.patch

git status (nothing to commit, working directory clean), however with changes commited

Delete your .git folder, and reinitialize the git with git init, in my case that's work , because git add command staging the folder and the files in .git folder, if you close CLI after the commit , there will be double folder in staging area that make git system throw this issue.

Image UriSource and Data Binding

WPF has built-in converters for certain types. If you bind the Image's Source property to a string or Uri value, under the hood WPF will use an ImageSourceConverter to convert the value to an ImageSource.

<Image Source="{Binding ImageSource}"/>

would work if the ImageSource property was a string representation of a valid URI to an image.

You can of course roll your own Binding converter:

public class ImageConverter : IValueConverter
{
    public object Convert(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        return new BitmapImage(new Uri(value.ToString()));
    }

    public object ConvertBack(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

and use it like this:

<Image Source="{Binding ImageSource, Converter={StaticResource ImageConverter}}"/>

Python: Figure out local timezone

For simple things, the following tzinfo implementation can be used, which queries the OS for time zone offsets:

import datetime
import time

class LocalTZ(datetime.tzinfo):
    _unixEpochOrdinal = datetime.datetime.utcfromtimestamp(0).toordinal()

    def dst(self, dt):
        return datetime.timedelta(0)

    def utcoffset(self, dt):
        t = (dt.toordinal() - self._unixEpochOrdinal)*86400 + dt.hour*3600 + dt.minute*60 + dt.second + time.timezone
        utc = datetime.datetime(*time.gmtime(t)[:6])
        local = datetime.datetime(*time.localtime(t)[:6])
        return local - utc


print datetime.datetime.now(LocalTZ())
print datetime.datetime(2010, 4, 27, 12, 0, 0, tzinfo=LocalTZ())

# If you're in the EU, the following datetimes are right on the DST change.
print datetime.datetime(2013, 3, 31, 0, 59, 59, tzinfo=LocalTZ())
print datetime.datetime(2013, 3, 31, 1, 0, 0, tzinfo=LocalTZ())
print datetime.datetime(2013, 3, 31, 1, 59, 59, tzinfo=LocalTZ())

# The following datetime is invalid, as the clock moves directly from
# 01:59:59 standard time to 03:00:00 daylight savings time.
print datetime.datetime(2013, 3, 31, 2, 0, 0, tzinfo=LocalTZ())

print datetime.datetime(2013, 10, 27, 0, 59, 59, tzinfo=LocalTZ())
print datetime.datetime(2013, 10, 27, 1, 0, 0, tzinfo=LocalTZ())
print datetime.datetime(2013, 10, 27, 1, 59, 59, tzinfo=LocalTZ())

# The following datetime is ambigous, as 02:00 can be either DST or standard
# time. (It is interpreted as standard time.)
print datetime.datetime(2013, 10, 27, 2, 0, 0, tzinfo=LocalTZ())

batch file - counting number of files in folder and storing in a variable

This might be a bit faster:

dir /A:-D /B *.* 2>nul | find /c /v ""

`/A:-D` - filters out only non directory items (files)
`/B`    - prints only file names (no need a full path request)
`*.*`   - can filters out specific file names (currently - all)
`2>nul` - suppresses all error lines output to does not count them

Extract the first word of a string in a SQL Server query

Marc's answer got me most of the way to what I needed, but I had to go with patIndex rather than charIndex because sometimes characters other than spaces mark the ends of my data's words. Here I'm using '%[ /-]%' to look for space, slash, or dash.

Select race_id, race_description
    , Case patIndex ('%[ /-]%', LTrim (race_description))
        When 0 Then LTrim (race_description)
        Else substring (LTrim (race_description), 1, patIndex ('%[ /-]%', LTrim (race_description)) - 1)
    End race_abbreviation
from tbl_races

Results...

race_id  race_description           race_abbreviation
-------  -------------------------  -----------------
1        White                      White
2        Black or African American  Black
3        Hispanic/Latino            Hispanic

Caveat: this is for a small data set (US federal race reporting categories); I don't know what would happen to performance when scaled up to huge numbers.

Get user's current location

MaxMind GeoIP is a good service. They also have a free city-level lookup service.

INSERT INTO a temp table, and have an IDENTITY field created, without first declaring the temp table?

You commented: not working if oldtable has an identity column.

I think that's your answer. The #newtable gets an identity column from the oldtable automatically. Run the next statements:

create table oldtable (id int not null identity(1,1), v varchar(10) )

select * into #newtable from oldtable

use tempdb
GO
sp_help #newtable

It shows you that #newtable does have the identity column.

If you don't want the identity column, try this at creation of #newtable:

select id + 1 - 1 as nid, v, IDENTITY( int ) as id into #newtable
     from oldtable

Search a whole table in mySQL for a string

In addition to pattern matching with 'like' keyword. You can also perform search by using fulltext feature as below;

SELECT * FROM clients WHERE MATCH (shipping_name, billing_name, email) AGAINST ('mary')

What are the advantages of Sublime Text over Notepad++ and vice-versa?

Main advantage for me is that Sublime Text 2 is almost the same, and has the same features on Windows, Linux and OS X. Can you claim that about Notepad++? It makes me move from one OS to another seamlessly.

Then there is speed. Sublime Text 2, which people claim is buggy and unstable ( 3 is more stable ), is still amazingly fast. If you use it, you will realize how fast it is.

Sublime Text 2 has some neat features like multi cursor input, multiple selections etc that will make you immensely productive.

Good number of plugins and themes, and also support for those of Textmate means you can do anything with Sublime Text 2. I have moved from Notepad++ to Sublime Text 2 on Windows and haven't looked back. The real question for me has been - Sublime Text 2 or vim?

What's good on Notepad++ side - it loads much faster on Windows for me. Maybe it will be good enough for you for quick editing. But, again, Sublime Text 3 is supposed to be faster on this front too. Sublime text 2 is not really good when it comes to handling huge files, and I had found that Notepad++ was pretty good till certain size of files. And, of course, Notepad++ is free. Sublime Text 2 has unlimited trial.

How often should Oracle database statistics be run?

When I was managing a large multi-user planning system backed by Oracle, our DBA had a weekly job that gathered statistics. Also, when we rolled out a significant change that could affect or be affected by statistics, we would force the job to run out of cycle to get things caught up.

Python: Select subset from list based on index set

I see 2 options.

Using numpy:

property_a = numpy.array([545., 656., 5.4, 33.])
property_b = numpy.array([ 1.2,  1.3, 2.3, 0.3])
good_objects = [True, False, False, True]
good_indices = [0, 3]
property_asel = property_a[good_objects]
property_bsel = property_b[good_indices]

Using a list comprehension and zip it:

property_a = [545., 656., 5.4, 33.]
property_b = [ 1.2,  1.3, 2.3, 0.3]
good_objects = [True, False, False, True]
good_indices = [0, 3]
property_asel = [x for x, y in zip(property_a, good_objects) if y]
property_bsel = [property_b[i] for i in good_indices]

Why not use Double or Float to represent currency?

Most answers have highlighted the reasons why one should not use doubles for money and currency calculations. And I totally agree with them.

It doesn't mean though that doubles can never be used for that purpose.

I have worked on a number of projects with very low gc requirements, and having BigDecimal objects was a big contributor to that overhead.

It's the lack of understanding about double representation and lack of experience in handling the accuracy and precision that brings about this wise suggestion.

You can make it work if you are able to handle the precision and accuracy requirements of your project, which has to be done based on what range of double values is one dealing with.

You can refer to guava's FuzzyCompare method to get more idea. The parameter tolerance is the key. We dealt with this problem for a securities trading application and we did an exhaustive research on what tolerances to use for different numerical values in different ranges.

Also, there might be situations when you're tempted to use Double wrappers as a map key with hash map being the implementation. It is very risky because Double.equals and hash code for example values "0.5" & "0.6 - 0.1" will cause a big mess.

Entity Framework Queryable async

Long story short,
IQueryable is designed to postpone RUN process and firstly build the expression in conjunction with other IQueryable expressions, and then interprets and runs the expression as a whole.
But ToList() method (or a few sort of methods like that), are ment to run the expression instantly "as is".
Your first method (GetAllUrlsAsync), will run imediately, because it is IQueryable followed by ToListAsync() method. hence it runs instantly (asynchronous), and returns a bunch of IEnumerables.
Meanwhile your second method (GetAllUrls), won't get run. Instead, it returns an expression and CALLER of this method is responsible to run the expression.

How to use SharedPreferences in Android to store, fetch and edit values

To edit data from sharedpreference

 SharedPreferences.Editor editor = getPreferences(MODE_PRIVATE).edit();
 editor.putString("text", mSaved.getText().toString());
 editor.putInt("selection-start", mSaved.getSelectionStart());
 editor.putInt("selection-end", mSaved.getSelectionEnd());
 editor.apply();

To retrieve data from sharedpreference

SharedPreferences prefs = getPreferences(MODE_PRIVATE); 
String restoredText = prefs.getString("text", null);
if (restoredText != null) 
{
  //mSaved.setText(restoredText, TextView.BufferType.EDITABLE);
  int selectionStart = prefs.getInt("selection-start", -1);
  int selectionEnd = prefs.getInt("selection-end", -1);
  /*if (selectionStart != -1 && selectionEnd != -1)
  {
     mSaved.setSelection(selectionStart, selectionEnd);
  }*/
}

Edit

I took this snippet from API Demo sample. It had an EditText box there . In this context it is not required.I am commenting the same .

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

Most probably deleting service fails because

protected override void OnStop()

throw error when stopping a service. wrapping things inside a try catch will prevent mark for deletion error

protected override void OnStop()
{
            try
            {
                //things to do
            }
            catch (Exception)
            {
            }

}

Alter Table Add Column Syntax

It could be doing the temp table renaming if you are trying to add a column to the beginning of the table (as this is easier than altering the order). Also, if there is data in the Employees table, it has to do insert select * so it can calculate the EmployeeID.

Java 8 lambda get and remove element from list

The below logic is the solution without modifying the original list

List<String> str1 = new ArrayList<String>();
str1.add("A");
str1.add("B");
str1.add("C");
str1.add("D");

List<String> str2 = new ArrayList<String>();
str2.add("D");
str2.add("E");

List<String> str3 = str1.stream()
                        .filter(item -> !str2.contains(item))
                        .collect(Collectors.toList());

str1 // ["A", "B", "C", "D"]
str2 // ["D", "E"]
str3 // ["A", "B", "C"]

printf not printing on console

Output is buffered.

stdout is line-buffered by default, which means that '\n' is supposed to flush the buffer. Why is it not happening in your case? I don't know. I need more info about your application/environment.

However, you can control buffering with setvbuf():

setvbuf(stdout, NULL, _IOLBF, 0);

This will force stdout to be line-buffered.

setvbuf(stdout, NULL, _IONBF, 0);

This will force stdout to be unbuffered, so you won't need to use fflush(). Note that it will severely affect application performance if you have lots of prints.

Fixing broken UTF-8 encoding

As Dan pointed out: you need to convert them to binary and then convert/correct the encoding.

E.g., for utf8 stored as latin1 the following SQL will fix it:

UPDATE table
   SET field = CONVERT( CAST(field AS BINARY) USING utf8)
 WHERE $broken_field_condition

Changing Fonts Size in Matlab Plots

If anyone was wondering how to change the font sizes without messing around with the Matlab default fonts, and change every font in a figure, I found this thread where suggests this:

set(findall(fig, '-property', 'FontSize'), 'FontSize', 10, 'fontWeight', 'bold')

findall is a pretty handy command and in the case above it really finds all the children who have a 'FontSize' property: axes lables, axes titles, pushbuttons, etc.

Hope it helps.

How can I upgrade NumPy?

When you already have an older version of NumPy, use this:

pip install numpy --upgrade

If it still doesn't work, try:

pip install numpy --upgrade --ignore-installed

How do I run a VBScript in 32-bit mode on a 64-bit machine?

   ' ***************
   ' *** 64bit check
   ' ***************
   ' check to see if we are on 64bit OS -> re-run this script with 32bit cscript
   Function RestartWithCScript32(extraargs)
   Dim strCMD, iCount
   strCMD = r32wShell.ExpandEnvironmentStrings("%SYSTEMROOT%") & "\SysWOW64\cscript.exe"
   If NOT r32fso.FileExists(strCMD) Then strCMD = "cscript.exe" ' This may not work if we can't find the SysWOW64 Version
   strCMD = strCMD & Chr(32) & Wscript.ScriptFullName & Chr(32)
   If Wscript.Arguments.Count > 0 Then
    For iCount = 0 To WScript.Arguments.Count - 1
     if Instr(Wscript.Arguments(iCount), " ") = 0 Then ' add unspaced args
      strCMD = strCMD & " " & Wscript.Arguments(iCount) & " "
     Else
      If Instr("/-\", Left(Wscript.Arguments(iCount), 1)) > 0 Then ' quote spaced args
       If InStr(WScript.Arguments(iCount),"=") > 0 Then
        strCMD = strCMD & " " & Left(Wscript.Arguments(iCount), Instr(Wscript.Arguments(iCount), "=") ) & """" & Mid(Wscript.Arguments(iCount), Instr(Wscript.Arguments(iCount), "=") + 1) & """ "
       ElseIf Instr(WScript.Arguments(iCount),":") > 0 Then
        strCMD = strCMD & " " & Left(Wscript.Arguments(iCount), Instr(Wscript.Arguments(iCount), ":") ) & """" & Mid(Wscript.Arguments(iCount), Instr(Wscript.Arguments(iCount), ":") + 1) & """ "
       Else
        strCMD = strCMD & " """ & Wscript.Arguments(iCount) & """ "
       End If
      Else
       strCMD = strCMD & " """ & Wscript.Arguments(iCount) & """ "
      End If
     End If
    Next
   End If
   r32wShell.Run strCMD & " " & extraargs, 0, False
   End Function

   Dim r32wShell, r32env1, r32env2, r32iCount
   Dim r32fso
   SET r32fso = CreateObject("Scripting.FileSystemObject")
   Set r32wShell = WScript.CreateObject("WScript.Shell")
   r32env1 = r32wShell.ExpandEnvironmentStrings("%PROCESSOR_ARCHITECTURE%")
   If r32env1 <> "x86" Then ' not running in x86 mode
    For r32iCount = 0 To WScript.Arguments.Count - 1
     r32env2 = r32env2 & WScript.Arguments(r32iCount) & VbCrLf
    Next
    If InStr(r32env2,"restart32") = 0 Then RestartWithCScript32 "restart32" Else MsgBox "Cannot find 32bit version of cscript.exe or unknown OS type " & r32env1
    Set r32wShell = Nothing
    WScript.Quit
   End If
   Set r32wShell = Nothing
   Set r32fso = Nothing
   ' *******************
   ' *** END 64bit check
   ' *******************

Place the above code at the beginning of your script and the subsequent code will run in 32bit mode with access to the 32bit ODBC drivers. Source.

jQuery Datepicker localization

datepicker in Finnish (Käännös suomeksi)

$.datepicker.regional['fi'] = {
  closeText: "Valmis", // Display text for close link
  prevText: "Edel", // Display text for previous month link
  nextText: "Seur", // Display text for next month link
  currentText: "Tänään", // Display text for current month link
  monthNames: [ "Tammikuu","Helmikuu","Maaliskuu","Huhtikuu","Toukokuu","Kesäkuu",
  "Heinäkuu","Elokuu","Syyskuu","Lokakuu","Marraskuu","Joulukuu" ], // Names of months for drop-down and formatting
  monthNamesShort: [ "Tam", "Hel", "Maa", "Huh", "Tou", "Kes", "Hei", "Elo", "Syy", "Lok", "Mar", "Jou" ], // For formatting
  dayNames: [ "Sunnuntai", "Maanantai", "Tiistai", "Keskiviikko", "Torstai", "Perjantai", "Lauantai" ], // For formatting
  dayNamesShort: [ "Sun", "Maa", "Tii", "Kes", "Tor", "Per", "Lau" ], // For formatting
  dayNamesMin: [ "Su","Ma","Ti","Ke","To","Pe","La" ], // Column headings for days starting at Sunday
  weekHeader: "Vk", // Column header for week of the year
  dateFormat: "mm/dd/yy", // See format options on parseDate
  firstDay: 0, // The first day of the week, Sun = 0, Mon = 1, ...
  isRTL: false, // True if right-to-left language, false if left-to-right
  showMonthAfterYear: false, // True if the year select precedes month, false for month then year
  yearSuffix: "" // Additional text to append to the year in the month headers
  };

foreach for JSON array , syntax

You can do something like

for(var k in result) {
   console.log(k, result[k]);
}

which loops over all the keys in the returned json and prints the values. However, if you have a nested structure, you will need to use

typeof result[k] === "object"

to determine if you have to loop over the nested objects. Most APIs I have used, the developers know the structure of what is being returned, so this is unnecessary. However, I suppose it's possible that this expectation is not good for all cases.

FPDF utf-8 encoding (HOW-TO)

Not sure if it will do for Greek, but I had the same issue for Brazilian Portuguese characters and my solution was to use html entities. I had basically two cases:

String may contain UTF-8 characters.

For these, I first encoded it to html entities with htmlentities() and then decoded them to iso-8859-1. Example:

$s = html_entity_decode(htmlentities($my_variable_text), ENT_COMPAT | ENT_HTML401, 'iso-8859-1');

Fixed string with html entities:

For these, I just left htmlentities() call out. Example:

$s = html_entity_decode("Treasurer/Tr&eacute;sorier", ENT_COMPAT | ENT_HTML401, 'iso-8859-1');

Then I passed $s to FPDF, like in this example:

$pdf->Cell(100, 20, $s, 0, 0, 'L');

Note: ENT_COMPAT | ENT_HTML401 is the standard value for parameter #2, as in http://php.net/manual/en/function.html-entity-decode.php

Hope that helps.

The condition has length > 1 and only the first element will be used

You get the error because if can only evaluate a logical vector of length 1.

Maybe you miss the difference between & (|) and && (||). The shorter version works element-wise and the longer version uses only the first element of each vector, e.g.:

c(TRUE, TRUE) & c(TRUE, FALSE)
# [1] TRUE FALSE

# c(TRUE, TRUE) && c(TRUE, FALSE)
[1] TRUE

You don't need the if statement at all:

mut1 <- trip$Ref.y=='G' & trip$Variant.y=='T'|trip$Ref.y=='C' & trip$Variant.y=='A'
trip[mut1, "mutType"] <- "G:C to T:A"

Convert String to Float in Swift

Easy way:

// toInt returns optional that's why we used a:Int?
let a:Int? = firstText.text.toInt()
let b:Int? = secondText.text.toInt()

// check a and b before unwrapping using !
if a && b {
    var ans = a! + b!
    answerLabel.text = "Answer is \(ans)"
} else {
    answerLabel.text = "Input values are not numberic"
}

you can use same approach for other calculations, hope this help !!

Query to get all rows from previous month

Here's another alternative. Assuming you have an indexed DATE or DATETIME type field, this should use the index as the formatted dates will be type converted before the index is used. You should then see a range query rather than an index query when viewed with EXPLAIN.

SELECT
    * 
FROM
    table
WHERE 
    date_created >= DATE_FORMAT( CURRENT_DATE - INTERVAL 1 MONTH, '%Y/%m/01' ) 
AND
    date_created < DATE_FORMAT( CURRENT_DATE, '%Y/%m/01' )

Dart: mapping a list (list.map)

I'm new to flutter. I found that one can also achieve it this way.

 tabs: [
    for (var title in movieTitles) Tab(text: title)
  ]

Note: It requires dart sdk version to be >= 2.3.0, see here

How to check if a date is in a given range?

In the format you've provided, assuming the user is smart enough to give you valid dates, you don't need to convert to a date first, you can compare them as strings.

Groovy / grails how to determine a data type?

Just to add another option to Dónal's answer, you can also still use the good old java.lang.Object.getClass() method.

MySQL Server has gone away when importing large sql file

I updated "max_allowed_packet" to 1024M, but it still wasn't working. It turns out my deployment script was running:

mysql --max_allowed_packet=512M --database=mydb -u root < .\db\db.sql

Be sure to explicitly specify a bigger number from the command line if you are donig it this way.

Can Windows' built-in ZIP compression be scripted?

There are both zip and unzip executables (as well as a boat load of other useful applications) in the UnxUtils package available on SourceForge (http://sourceforge.net/projects/unxutils). Copy them to a location in your PATH, such as 'c:\windows', and you will be able to include them in your scripts.

This is not the perfect solution (or the one you asked for) but a decent work-a-round.

Using floats with sprintf() in embedded C

Many embedded systems have a limited snprintf function that doesn't handle floats. I wrote this, and it does the trick fairly efficiently. I chose to use 64-bit unsigned integers to be able to handle large floats, so feel free to reduce them down to 16-bit or whatever needs you may have with limited resources.

#include <stdio.h>   // for uint64_t support.


int  snprintf_fp( char destination[], size_t available_chars, int decimal_digits,
                  char tail[], float source_number )
{
    int   chars_used  = 0;    // This will be returned.


    if ( available_chars > 0 )
    {
        // Handle a negative sign.
        if ( source_number < 0 )
        {
            // Make it positive
            source_number = 0 - source_number;
            destination[ 0 ] = '-';
            ++chars_used;
        }

        // Handle rounding
        uint64_t zeros = 1;
        for ( int i = decimal_digits; i > 0; --i )
            zeros *= 10;

        uint64_t source_num = (uint64_t)( ( source_number * (float)zeros ) + 0.5f );

        // Determine sliding divider max position.
        uint64_t  div_amount = zeros;       // Give it a head start
        while ( ( div_amount * 10 ) <= source_num )
            div_amount *= 10;

        // Process the digits
        while ( div_amount > 0 )
        {
            uint64_t whole_number = source_num / div_amount;
            if ( chars_used < (int)available_chars )
            {
                destination[ chars_used ] = '0' + (char)whole_number;
                ++chars_used;

                if ( ( div_amount == zeros ) && ( zeros > 1 ) )
                {
                    destination[ chars_used ] = '.';
                    ++chars_used;
                }
            }
            source_num -= ( whole_number * div_amount );
            div_amount /= 10;
        }


        // Store the zero.
        destination[ chars_used ] = 0;

        // See if a tail was specified.
        size_t tail_len = strlen( tail );

        if ( ( tail_len > 0 ) && ( tail_len + chars_used < available_chars ) )
        {
            for ( size_t i = 0; i <= tail_len; ++i )
                destination[ chars_used + i ] = tail[ i ];
            chars_used += tail_len;
        }
    }

    return chars_used;
}

main()
{
    #define TEMP_BUFFER_SIZE 30
    char temp_buffer[ TEMP_BUFFER_SIZE ];
    char  degrees_c[] = { (char)248, 'C', 0 };
    float  float_temperature = 26.845f;

    int len = snprintf_fp( temp_buffer, TEMP_BUFFER_SIZE, 2, degrees_c, float_temperature );
}

Node.js res.setHeader('content-type', 'text/javascript'); pushing the response javascript as file download

Use application/javascript as content type instead of text/javascript

text/javascript is mentioned obsolete. See reference docs.

http://www.iana.org/assignments/media-types/application

Also see this question on SO.

UPDATE:

I have tried executing the code you have given and the below didn't work.

res.setHeader('content-type', 'text/javascript');
res.send(JS_Script);

This is what worked for me.

res.setHeader('content-type', 'text/javascript');
res.end(JS_Script);

As robertklep has suggested, please refer to the node http docs, there is no response.send() there.

Twitter bootstrap progress bar animation on page load

In contribution to ellabeauty's answer. you can also use this dynamic percentage values

$('.bar').css('width',  function(){ return ($(this).attr('data-percentage')+'%')});

And probably add custom easing to your css

.bar {
 -webkit-transition: width 2.50s ease !important;
 -moz-transition: width 2.50s ease !important;
   -o-transition: width 2.50s ease !important;
      transition: width 2.50s ease !important;
 }

java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist

Just try Clean Project & Rebuild Project.

add string to String array

As many of the answer suggesting better solution is to use ArrayList. ArrayList size is not fixed and it is easily manageable.

It is resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to store the list.

Each ArrayList instance has a capacity. The capacity is the size of the array used to store the elements in the list. It is always at least as large as the list size. As elements are added to an ArrayList, its capacity grows automatically.

Note that this implementation is not synchronized.

ArrayList<String> scripts = new ArrayList<String>();
scripts.add("test1");
scripts.add("test2");
scripts.add("test3");

Decrypt password created with htpasswd

.htpasswd entries are HASHES. They are not encrypted passwords. Hashes are designed not to be decryptable. Hence there is no way (unless you bruteforce for a loooong time) to get the password from the .htpasswd file.

What you need to do is apply the same hash algorithm to the password provided to you and compare it to the hash in the .htpasswd file. If the user and hash are the same then you're a go.

Choosing the correct upper and lower HSV boundaries for color detection with`cv::inRange` (OpenCV)

OpenCV HSV range is: H: 0 to 179 S: 0 to 255 V: 0 to 255

On Gimp (or other photo manipulation sw) Hue range from 0 to 360, since opencv put color info in a single byte, the maximum number value in a single byte is 255 therefore openCV Hue values are equivalent to Hue values from gimp divided by 2.

I found when trying to do object detection based on HSV color space that a range of 5 (opencv range) was sufficient to filter out a specific color. I would advise you to use an HSV color palate to figure out the range that works best for your application.

How to convert jsonString to JSONObject in Java

If you are using http://json-lib.sourceforge.net (net.sf.json.JSONObject)

it is pretty easy:

String myJsonString;
JSONObject json = JSONObject.fromObject(myJsonString);

JSONObject json = JSONSerializer.toJSON(myJsonString);

get the values then with json.getString(param), json.getInt(param) and so on.

OR condition in Regex

Try

\d \w |\d

or add a positive lookahead if you don't want to include the trailing space in the match

\d \w(?= )|\d

When you have two alternatives where one is an extension of the other, put the longer one first, otherwise it will have no opportunity to be matched.

Send data from activity to fragment in Android

I´ve found a lot of answers here @ stackoverflow.com but definitely this is the correct answer of:

"Sending data from activity to fragment in android".

Activity:

        Bundle bundle = new Bundle();
        String myMessage = "Stackoverflow is cool!";
        bundle.putString("message", myMessage );
        FragmentClass fragInfo = new FragmentClass();
        fragInfo.setArguments(bundle);
        transaction.replace(R.id.fragment_single, fragInfo);
        transaction.commit();

Fragment:

Reading the value in the fragment

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Bundle bundle = this.getArguments();
        String myValue = bundle.getString("message");
        ...
        ...
        ...
        }

or just

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        String myValue = this.getArguments().getString("message");
        ...
        ...
        ...
        }

Java: Simplest way to get last word in a string

If other whitespace characters are possible, then you'd want:

testString.split("\\s+");

Rails Model find where not equal

Rails 4

GroupUser.where.not(user_id: me)

How to select multiple rows filled with constants?

Here is how to do it using the XML features of DB2

SELECT *
FROM
XMLTABLE ('$doc/ROWSET/ROW' PASSING XMLPARSE ( DOCUMENT '
<ROWSET>
  <ROW>
    <A val="1" /> <B val="2" /> <C val="3" />
  </ROW>
  <ROW>
    <A val="4" /> <B val="5" /> <C val="6" />
  </ROW>
  <ROW>
    <A val="7" /> <B val="8" /> <C val="9" />
  </ROW>
</ROWSET>
') AS "doc"
   COLUMNS 
      "A" INT PATH 'A/@val',
      "B" INT PATH 'B/@val',
      "C" INT PATH 'C/@val'
) 
AS X
;

jQuery - determine if input element is textbox or select list

If you just want to check the type, you can use jQuery's .is() function,

Like in my case I used below,

if($("#id").is("select")) {
 alert('Select'); 
else if($("#id").is("input")) {
 alert("input");
}

Failed to load AppCompat ActionBar with unknown error in android studio

Try this:

Just change:

compile 'com.android.support:appcompat-v7:26.0.0-beta2'

to:

compile 'com.android.support:appcompat-v7:26.0.0-beta1'

Reference

How to reset all checkboxes using jQuery or pure JS?

If you want to use form's reset feature, you'd better to use this:

$('input[type=checkbox]').prop('checked',true);

$('input[type=checkbox]').prop('checked',false);

Looks like removeAttr() can not be reset by form.reset().

How to send HTTP request in java?

From Oracle's java tutorial

import java.net.*;
import java.io.*;

public class URLConnectionReader {
    public static void main(String[] args) throws Exception {
        URL yahoo = new URL("http://www.yahoo.com/");
        URLConnection yc = yahoo.openConnection();
        BufferedReader in = new BufferedReader(
                                new InputStreamReader(
                                yc.getInputStream()));
        String inputLine;

        while ((inputLine = in.readLine()) != null) 
            System.out.println(inputLine);
        in.close();
    }
}

How do I execute external program within C code in linux with arguments?

How about like this:

char* cmd = "./foo 1 2 3";
system(cmd);

Keyboard shortcut to comment lines in Sublime Text 3

i am ubuntu 18 with sublime text 3.2

CTR + /

Update Query with INNER JOIN between tables in 2 different databases on 1 server

You could call it just style, but I prefer aliasing to improve readability.

UPDATE A    
  SET ControllingSalesRep = RA.SalesRepCode   
from DHE.dbo.tblAccounts A
  INNER JOIN DHE_Import.dbo.tblSalesRepsAccountsLink RA
    ON A.AccountCode = RA.AccountCode

For MySQL

UPDATE DHE.dbo.tblAccounts A 
  INNER JOIN DHE_Import.dbo.tblSalesRepsAccountsLink RA 
      ON A.AccountCode = RA.AccountCode 
SET A.ControllingSalesRep = RA.SalesRepCode

Does the Java &= operator apply & or &&?

i came across a similar situation using booleans where I wanted to avoid calling b() if a was already false.

This worked for me:

a &= a && b()

AngularJS multiple filter with custom filter function

Try this:

<tr ng-repeat="player in players | filter:{id: player_id, name:player_name} | filter:ageFilter">

$scope.ageFilter = function (player) {
    return (player.age > $scope.min_age && player.age < $scope.max_age);
}

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

1with handler:

handler.sendEmptyMessageDelayed(1, 10000);
}

private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        if (msg.what == 1) {
           //your code
        }
    }
};

How to pass parameters in $ajax POST?

$.ajax(
   {
      type: 'post',
      url: 'superman',
      data: { 
        "field1": "hello",
        "field2": "hello1"
      },
      success: function (response) {
        alert("Success !!");
      },
      error: function () {
        alert("Error !!");
      }
   }
);

type: 'POST', will append **parameters to the body of the request** which is not seen in the URL while type: 'GET', appends parameters to the URL which is visible.

Most of the popular web browsers contain network panels which displays the complete request.

In network panel select XHR to see requests.

This can also be done via this.

$.post('superman',
      { 
        'field1': 'hello', 
        'field2': 'hello1'
      },
      function (response) {
        alert("Success !");
      }
    );

space between divs - display table-cell

Well, the above does work, here is my solution that requires a little less markup and is more flexible.

_x000D_

.cells {_x000D_
  display: inline-block;_x000D_
  float: left;_x000D_
  padding: 1px;_x000D_
}_x000D_
.cells>.content {_x000D_
  background: #EEE;_x000D_
  display: table-cell;_x000D_
  float: left;_x000D_
  padding: 3px;_x000D_
  vertical-align: middle;_x000D_
}

_x000D_

<div id="div1" class="cells"><div class="content">My Cell 1</div></div>_x000D_
<div id="div2" class="cells"><div class="content">My Cell 2</div></div>

_x000D_

What’s the best way to load a JSONObject from a json text file?

try this:

import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;
import org.apache.commons.io.IOUtils; 

    public class JsonParsing {

        public static void main(String[] args) throws Exception {
            InputStream is = 
                    JsonParsing.class.getResourceAsStream( "sample-json.txt");
            String jsonTxt = IOUtils.toString( is );

            JSONObject json = (JSONObject) JSONSerializer.toJSON( jsonTxt );        
            double coolness = json.getDouble( "coolness" );
            int altitude = json.getInt( "altitude" );
            JSONObject pilot = json.getJSONObject("pilot");
            String firstName = pilot.getString("firstName");
            String lastName = pilot.getString("lastName");

            System.out.println( "Coolness: " + coolness );
            System.out.println( "Altitude: " + altitude );
            System.out.println( "Pilot: " + lastName );
        }
    }

and this is your sample-json.txt , should be in json format

{
 'foo':'bar',
 'coolness':2.0,
 'altitude':39000,
 'pilot':
     {
         'firstName':'Buzz',
         'lastName':'Aldrin'
     },
 'mission':'apollo 11'
}

AngularJS: How to clear query parameters in the URL?

You can delete a specific query parameter by using:

delete $location.$$search.nameOfParameter;

Or you can clear all the query params by setting search to an empty object:

$location.$$search = {};

Find everything between two XML tags with RegEx

You should be able to match it with: /<primaryAddress>(.+?)<\/primaryAddress>/

The content between the tags will be in the matched group.

replacing text in a file with Python

Reading from standard input, write 'code.py' as follows:

import sys

rep = {'zero':'0', 'temp':'bob', 'garbage':'nothing'}

for line in sys.stdin:
    for k, v in rep.iteritems():
        line = line.replace(k, v)
    print line

Then, execute the script with redirection or piping (http://en.wikipedia.org/wiki/Redirection_(computing))

python code.py < infile > outfile

How can I make Visual Studio wrap lines at 80 characters?

You can also use

Ctrl+E, Ctrl+W

keyboard shortcut to toggle wrap lines on and off.

How can I clone a JavaScript object except for one key?

Here are my two cents, on Typescript, slightly derived from @Paul's answer and using reduce instead.

function objectWithoutKey(object: object, keys: string[]) {
    return keys.reduce((previousValue, currentValue) => {
        // @ts-ignore
        const {[currentValue]: undefined, ...clean} = previousValue;
        return clean
    }, object)
}

// usage
console.log(objectWithoutKey({a: 1, b: 2, c: 3}, ['a', 'b']))

How to declare Return Types for Functions in TypeScript

functionName() : ReturnType { ... }

Git checkout - switching back to HEAD

You can stash (save the changes in temporary box) then, back to master branch HEAD.

$ git add .
$ git stash
$ git checkout master

Jump Over Commits Back and Forth:

Go to a specific commit-sha.
```
  $ git checkout <commit-sha>
```

If you have uncommitted changes here then, you can checkout to a new branch | Add | Commit | Push the current branch to the remote.

  # checkout a new branch, add, commit, push
  $ git checkout -b <branch-name>
  $ git add .
  $ git commit -m 'Commit message'
  $ git push origin HEAD          # push the current branch to remote 

  $ git checkout master           # back to master branch now

If you have changes in the specific commit and don't want to keep the changes, you can do stash or reset then checkout to master (or, any other branch).
```
  # stash
  $ git add -A
  $ git stash
  $ git checkout master

  # reset
  $ git reset --hard HEAD
  $ git checkout master
```

After checking out a specific commit if you have no uncommitted change(s) then, just back to master or other branch.

  $ git status          # see the changes
  $ git checkout master

  # or, shortcut
  $ git checkout -      # back to the previous state

How can I create an array/list of dictionaries in python?

This is how I did it and it works:

dictlist = [dict() for x in range(n)]

It gives you a list of n empty dictionaries.

How can I display an image from a file in Jupyter Notebook?

If you are trying to display an Image in this way inside a loop, then you need to wrap the Image constructor in a display method.

from IPython.display import Image, display

listOfImageNames = ['/path/to/images/1.png',
                    '/path/to/images/2.png']

for imageName in listOfImageNames:
    display(Image(filename=imageName))

Extract values in Pandas value_counts()

#!/usr/bin/env python

import pandas as pd

# Make example dataframe
df = pd.DataFrame([(1, 'Germany'),
                   (2, 'France'),
                   (3, 'Indonesia'),
                   (4, 'France'),
                   (5, 'France'),
                   (6, 'Germany'),
                   (7, 'UK'),
                   ],
                  columns=['groupid', 'country'],
                  index=['a', 'b', 'c', 'd', 'e', 'f', 'g'])

# What you're looking for
values = df['country'].value_counts().keys().tolist()
counts = df['country'].value_counts().tolist()

Now, print(df['country'].value_counts()) gives:

France       3
Germany      2
UK           1
Indonesia    1

and print(values) gives:

['France', 'Germany', 'UK', 'Indonesia']

and print(counts) gives:

[3, 2, 1, 1]

Do a "git export" (like "svn export")?

This will copy the files in a range of commits (C to G) to a tar file. Note: this will only get the files commited. Not the entire repository. Slightly modified from Here

Example Commit History

A --> B --> C --> D --> E --> F --> G --> H --> I

git diff-tree -r --no-commit-id --name-only --diff-filter=ACMRT C~..G | xargs tar -rf myTarFile.tar

git-diff-tree Manual Page

-r --> recurse into sub-trees

--no-commit-id --> git diff-tree outputs a line with the commit ID when applicable. This flag suppressed the commit ID output.

--name-only --> Show only names of changed files.

--diff-filter=ACMRT --> Select only these files. See here for full list of files

C..G --> Files in this range of commits

C~ --> Include files from Commit C. Not just files since Commit C.

| xargs tar -rf myTarFile --> outputs to tar

Determining complexity for recursive functions (Big O notation)

I see that for the accepted answer (recursivefn5), some folks are having issues with the explanation. so I'd try to clarify to the best of my knowledge.

The for loop runs for n/2 times because at each iteration, we are increasing i (the counter) by a factor of 2. so say n = 10, the for loop will run 10/2 = 5 times i.e when i is 0,2,4,6 and 8 respectively.
In the same regard, the recursive call is reduced by a factor of 5 for every time it is called i.e it runs for n/5 times. Again assume n = 10, the recursive call runs for 10/5 = 2 times i.e when n is 10 and 5 and then it hits the base case and terminates.
Calculating the total run time, the for loop runs n/2 times for every time we call the recursive function. since the recursive fxn runs n/5 times (in 2 above),the for loop runs for (n/2) * (n/5) = (n^2)/10 times, which translates to an overall Big O runtime of O(n^2) - ignoring the constant (1/10)...

How can I get the actual video URL of a YouTube live stream?

~~Yes this is possible~~ Since the question is update, this solution can only gives you the embed url not the HLS url, check @JAL answer. with the ressource search.list and the parameters:

* part: id
* channelId: UCURGpU4lj3dat246rysrWsw
* eventType: live
* type: video

Request :

GET https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCURGpU4lj3dat246rysrWsw&eventType=live&type=video&key={YOUR_API_KEY}

Result:

 "items": [
  {
   "kind": "youtube#searchResult",
   "etag": "\"DsOZ7qVJA4mxdTxZeNzis6uE6ck/enc3-yCp8APGcoiU_KH-mSKr4Yo\"",
   "id": {
    "kind": "youtube#video",
    "videoId": "WVZpCdHq3Qg"
   }
  },

Then get the videoID value WVZpCdHq3Qg for example and add the value to this url:

https://www.youtube.com/embed/ + videoID
https://www.youtube.com/watch?v= + videoID

How to debug a stored procedure in Toad?

Basic Steps to Debug a Procedure in Toad

Load your Procedure in Toad Editor.
Put debug point on the line where you want to debug.See the first screenshot.
Right click on the editor Execute->Execute PLSQL(Debugger).See the second screeshot.
A window opens up,you need to select the procedure from the left side and pass parameters for that procedure and then click Execute.See the third screenshot.
Now start your debugging check Debug-->Step Over...Add Watch etc.

Reference:Toad Debugger

Debug

Execute In Debug

parameter

Inserting a blank table row with a smaller height

Just add the CSS rule (and the slightly improved mark-up) posted below and you should get the result that you're after.

CSS

.blank_row
{
    height: 10px !important; /* overwrites any other rules */
    background-color: #FFFFFF;
}

HTML

<tr class="blank_row">
    <td colspan="3"></td>
</tr>

Since I have no idea what your current stylesheet looks like I added the !important property just in case. If possible, though, you should remove it as one rarely wants to rely on !important declarations in a stylesheet considering the big possibility that they will mess it up later on.

Invalid column count in CSV input on line 1 Error

I just had this issue and realized that there were empty columns being treated as columns with values, I saw this by opening my CSV in my text editor. To fix this, I opened my spreadsheet and deleted the columns after my last column, they looked completely empty but they were not. After I did this, the import worked perfectly.

What is the equivalent to getch() & getche() in Linux?

You can use the curses.h library in linux as mentioned in the other answer.

You can install it in Ubuntu by:

sudo apt-get update

sudo apt-get install ncurses-dev

I took the installation part from here.

How can I get the last 7 characters of a PHP string?

for last 7 characters

$newstring = substr($dynamicstring, -7);

$newstring : 5409els

for first 7 characters

$newstring = substr($dynamicstring, 0, 7);

$newstring : 2490slk

.NET / C# - Convert char[] to string

One other way:

char[] chars = {'a', ' ', 's', 't', 'r', 'i', 'n', 'g'};
string s = string.Join("", chars);
//we get "a string"
// or for fun:
string s = string.Join("_", chars);
//we get "a_ _s_t_r_i_n_g"

What is the best/simplest way to read in an XML file in Java application?

Is there a particular reason you have chosen XML config files? I have done XML configs in the past, and they have often turned out to be more of a headache than anything else.

I guess the real question is whether using something like the Preferences API might work better in your situation.

Reasons to use the Preferences API over a roll-your-own XML solution:

Avoids typical XML ugliness (DocumentFactory, etc), along with avoiding 3rd party libraries to provide the XML backend
Built in support for default values (no special handling required for missing/corrupt/invalid entries)
No need to sanitize values for XML storage (CDATA wrapping, etc)
Guaranteed status of the backing store (no need to constantly write XML out to disk)
Backing store is configurable (file on disk, LDAP, etc.)
Multi-threaded access to all preferences for free

How to insert selected columns from a CSV file to a MySQL database using LOAD DATA INFILE

Example:

contents of the ae.csv file:

"Date, xpto 14"
"code","number","year","C"
"blab","15885","2016","Y"
"aeea","15883","1982","E"
"xpto","15884","1986","B"
"jrgg","15885","1400","A"

CREATE TABLE Tabletmp (  
    rec VARCHAR(9) 
);

For put only column 3:

LOAD DATA INFILE '/local/ae.csv' 
INTO TABLE Tabletmp
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\r\n'
IGNORE 2 LINES
(@col1, @col2, @col3, @col4, @col5)
set rec = @col3;


select * from Tabletmp;
    2016
    1982
    1986
    1400

Print directly from browser without print popup window

this.print(false);

I tried this in Chrome, Firefox and IE. It works only in Firefox and IE, it uses the default printer (with default print settings) and only works when I render a PDF (I use Foxit Reader with Safe Reading Mode disabled). Chrome shows the print dialog, also the other browsers when I render an HTML page.

Better way to call javascript function in a tag

Neither is good.

Behaviour should be configured independent of the actual markup. For instance, in jQuery you might do something like

$('#the-element').click(function () { /* perform action here */ });

in a separate <script> block.

The advantage of this is that it

Separates markup and behaviour in the same way that CSS separates markup and style
Centralises configuration (this is somewhat a corollary of 1).
Is trivially extensible to include more than one argument using jQuery’s powerful selector syntax

Furthermore, it degrades gracefully (but so would using the onclick event) since you can provide the link tags with a href in case the user doesn’t have JavaScript enabled.

Of course, these arguments still count if you’re not using jQuery or another JavaScript library (but why do that?).

Animate text change in UILabel

With Swift 5, you can choose one of the two following Playground code samples in order to animate your UILabel's text changes with some cross dissolve animation.

#1. Using `UIView`'s `transition(with:duration:options:animations:completion:)` class method

import UIKit
import PlaygroundSupport

class ViewController: UIViewController {

    let label = UILabel()

    override func viewDidLoad() {
        super.viewDidLoad()

        label.text = "Car"

        view.backgroundColor = .white
        view.addSubview(label)

        label.translatesAutoresizingMaskIntoConstraints = false
        label.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        label.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true

        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(toggle(_:)))
        view.addGestureRecognizer(tapGesture)
    }

    @objc func toggle(_ sender: UITapGestureRecognizer) {
        let animation = {
            self.label.text = self.label.text == "Car" ? "Plane" : "Car"
        }
        UIView.transition(with: label, duration: 2, options: .transitionCrossDissolve, animations: animation, completion: nil)
    }

}

let controller = ViewController()
PlaygroundPage.current.liveView = controller

#2. Using `CATransition` and `CALayer`'s `add(_:forKey:)` method

import UIKit
import PlaygroundSupport

class ViewController: UIViewController {

    let label = UILabel()
    let animation = CATransition()

    override func viewDidLoad() {
        super.viewDidLoad()

        label.text = "Car"

        animation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
        // animation.type = CATransitionType.fade // default is fade
        animation.duration = 2

        view.backgroundColor = .white
        view.addSubview(label)

        label.translatesAutoresizingMaskIntoConstraints = false
        label.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        label.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true

        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(toggle(_:)))
        view.addGestureRecognizer(tapGesture)
    }

    @objc func toggle(_ sender: UITapGestureRecognizer) {
        label.layer.add(animation, forKey: nil) // The special key kCATransition is automatically used for transition animations
        label.text = label.text == "Car" ? "Plane" : "Car"
    }

}

let controller = ViewController()
PlaygroundPage.current.liveView = controller

How to handle Uncaught (in promise) DOMException: The play() request was interrupted by a call to pause()

adding muted="muted" property to HTML5 tag solved my issue

How to read file binary in C#?

You can use BinaryReader to read each of the bytes, then use BitConverter.ToString(byte[]) to find out how each is represented in binary.

You can then use this representation and write it to a file.

Using ffmpeg to change framerate

Simply specify the desired framerate in "-r " option before the input file:

ffmpeg -y -r 24 -i seeing_noaudio.mp4 seeing.mp4

Options affect the next file AFTER them. "-r" before an input file forces to reinterpret its header as if the video was encoded at the given framerate. No recompression is necessary. There was a small utility avifrate.exe to patch avi file headers directly to change the framerate. ffmpeg command above essentially does the same, but has to copy the entire file.

finding first day of the month in python

Yes, first set a datetime to the start of the current month.

Second test if current date day > 25 and get a true/false on that. If True then add add one month to the start of month datetime object. If false then use the datetime object with the value set to the beginning of the month.

import datetime 
from dateutil.relativedelta import relativedelta

todayDate = datetime.date.today()
resultDate = todayDate.replace(day=1)

if ((todayDate - resultDate).days > 25):
    resultDate = resultDate + relativedelta(months=1)

print resultDate

Angular 5 - Copy to clipboard

First suggested solution works, we just need to change

selBox.value = val;

selBox.innerText = val;

i.e.,

HTML:

<button (click)="copyMessage('This goes to Clipboard')" value="click to copy" >Copy this</button>

.ts file:

copyMessage(val: string){
    const selBox = document.createElement('textarea');
    selBox.style.position = 'fixed';
    selBox.style.left = '0';
    selBox.style.top = '0';
    selBox.style.opacity = '0';
    selBox.innerText = val;
    document.body.appendChild(selBox);
    selBox.focus();
    selBox.select();
    document.execCommand('copy');
    document.body.removeChild(selBox);
  }

Programs & Examples On #Mockup tool

Have a reloadData for a UITableView animate when changing

Have more freedom using CATransition class.

It isn't limited to fading, but can do movements as well..

For example:

Implementation in Swift:

Swift 5:

Installing tkinter on ubuntu 14.04

Simple search MySQL database using php

JRE 1.7 - java version - returns: java/lang/NoClassDefFoundError: java/lang/Object

Convert a space delimited string to list

Removing underline with href attribute

Returning Month Name in SQL Server Query

What does git rev-parse do?

How do malloc() and free() work?

Jenkins - how to build a specific branch

HTTP GET in VB.NET

illegal use of break statement; javascript

Check whether number is even or odd

Sending HTML email using Python

iPhone UIView Animation Best Practice

jQuery hyperlinks - href value?

Failed to find 'ANDROID_HOME' environment variable

Create web service proxy in Visual Studio from a WSDL file

How do I calculate tables size in Oracle

Get a timestamp in C in microseconds?

How to convert an integer (time) to HH:MM:SS::00 in SQL Server 2008?

Select count(*) from multiple tables

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

NodeJS / Express: what is "app.use"?

How to test enum types?

Increase days to php current Date()

CSS background-image not working

How do you convert between 12 hour time and 24 hour time in PHP?

How do I round to the nearest 0.5?

PHP how to get local IP of system

foreach vs someList.ForEach(){}

How can I solve equations in Python?

VBScript: Using WScript.Shell to Execute a Command Line Program That Accesses Active Directory

Right align text in android TextView

How do I create a new line in Javascript?

Is there a way to call a stored procedure with Dapper?

Move / Copy File Operations in Java

What are sessions? How do they work?

Html attributes for EditorFor() in ASP.NET MVC

How to redirect to a route in laravel 5 by using href tag if I'm not using blade or any template?

when working with laravel blade

without blade

iOS: Multi-line UILabel in Auto Layout

How to configure Fiddler to listen to localhost?

What's the best way to get the last element of an array without deleting it?

Make a td fixed size (width,height) while rest of td's can expand

Read Session Id using Javascript

How to add white spaces in HTML paragraph

Get all unique values in a JavaScript array (remove duplicates)

PHP __get and __set magic methods

jQuery - Follow the cursor with a DIV

Split and join C# string

Send FormData and String Data Together Through JQuery AJAX?

Java string split with "." (dot)

How to generate UML diagrams (especially sequence diagrams) from Java code?

How to change the font size and color of x-axis and y-axis label in a scatterplot with plot function in R?

Have a variable in images path in Sass?

Aren't Python strings immutable? Then why does a + " " + b work?

How to save local data in a Swift app?

MySQL SELECT only not null values

How to store JSON object in SQLite database

Javascript to check whether a checkbox is being checked or unchecked

Working copy XXX locked and cleanup failed in SVN

Why can't I use the 'await' operator within the body of a lock statement?

"register" keyword in C?

How to create a dialog with “yes” and “no” options?

How to split elements of a list?

How to set a binding in Code?

How to use paginator from material angular?

How to match hyphens with Regular Expression?

SQL: Combine Select count(*) from multiple tables

How to print a groupby object

How to dynamically add a class to manual class names?

How to create a thread?

Have more freedom using `CATransition` class.

PHP get and set magic methods