Tutorial by Examples: ha

Dynamic Arrays Adding and reducing variables on an array dynamically is a huge advantage for when the information you are treating does not have a set number of variables. Adding Values Dynamically You can simply resize the Array with the ReDim Statement, this will resize the array but to if you ...

In Emacs, basic search tool (I-Search) allows you to search after or before the location of your cursor. To search for sometext after the location of your cursor (search-forward) hit C-s sometext. If you want to go to the next occurence of sometext, just press C-s again (and so on for the ne...

It forces you to explicitly declare all variables. What is the difference between explicitly declaring and implicitly declaring a variable? Explicitly declaring a variable: Dim anInteger As Integer = 1234 Implicitly declaring a variable: 'Did not declare aNumber using Dim aNumber = 1234 C...

The System.String class supports a number of methods to convert between uppercase and lowercase characters in a string. System.String.ToLowerInvariant is used to return a String object converted to lowercase. System.String.ToUpperInvariant is used to return a String object converted to upper...

Problem: If after the AsyncTask starts there is a screen rotation the owning activity is destroyed and recreated. When the AsyncTask finishes it wants to update the UI that may not valid anymore. Solution: Using Loaders, one can easily overcome the activity destruction/recreation. Example: ...

select returns a new hash with key-value pairs for which the block evaluates to true. { :a => 1, :b => 2, :c => 3 }.select { |k, v| k != :a && v.even? } # => { :b => 2 } When you will not need the key or value in a filter block, the convention is to use an _ in that place:...

Intersection of Hashes To get the intersection of two hashes, return the shared keys the values of which are equal: hash1 = { :a => 1, :b => 2 } hash2 = { :b => 2, :c => 3 } hash1.select { |k, v| (hash2.include?(k) && hash2[k] == v) } # => { :b => 2 } Union (...

Many unbound generic parameters, like those used in a static method, cannot be recovered at runtime (see Other Threads on Erasure). However there is a common strategy employed for accessing the type satisfying a generic parameter on a class at runtime. This allows for generic code that depends on ac...

aiohttp provides asynchronous websockets. Python 3.x3.5 import asyncio from aiohttp import ClientSession with ClientSession() as session: async def hello_world(): websocket = await session.ws_connect("wss://echo.websocket.org") websocket.send_str("Hell...

aiohttp.ClientSession may be used as a parent for a custom WebSocket class. Python 3.x3.5 import asyncio from aiohttp import ClientSession class EchoWebSocket(ClientSession): URL = "wss://echo.websocket.org" def __init__(self): super().__init__() self....

Mockito.when(mock.returnSomething()).thenReturn("my val"); mock.returnSomething(); // returns "my val" mock.returnSomething(); // returns "my val" again mock.returnSomething(); // returns "my val" again and again and again... If you want different valu...

<?php $to = '[email protected]'; $subject = 'Email Subject'; $message = 'This is the email message body'; $attachment = '/path/to/your/file.pdf'; $content = file_get_contents($attachment); /* Attachment content transferred in Base64 encoding MUST be split into chunk...

<?php $mail = new PHPMailer(); $mail->From = "[email protected]"; $mail->FromName = "Full Name"; $mail->addReplyTo("[email protected]", "Reply Address"); $mail->Subject = "Subject Text"; $mail->Body = "This is...

<?php $sendgrid = new SendGrid("YOUR_SENDGRID_API_KEY"); $email = new SendGrid\Email(); $email->addTo("[email protected]") ->setFrom("[email protected]") ->setSubject("Subject Text") ->setText("This is a ...

Properties with notify:true also fires an event <link rel="import" href="../bower_components/paper-input/paper-input.html"> <dom-module id="property-change-event"> <template> <style></style> <paper-input id="input&quo...

get-childitem | foreach-object { if ($_.IsReadOnly) { return } } Pipeline cmdlets (ex: ForEach-Object, Where-Object, etc) operate on closures. The return here will only move to the next item on the pipeline, not exit processing. You can use break instead of return if you want to exit processing...

Inspired by PowerShell: Function doesn't have proper return value function bar { [System.Collections.ArrayList]$MyVariable = @() $MyVariable.Add("a") | Out-Null $MyVariable.Add("b") | Out-Null $MyVariable } The Out-Null is necessary because the .NET ArrayLis...

(paraphrased from about_return) The following methods will have the same values on the pipeline function foo { $a = "Hello" return $a } function bar { $a = "Hello" $a return } function quux { $a = "Hello" $a }

Obfuscation is often considered as a magic solution for code protection, by making your code harder to understand if it ever gets de-compiled by hackers. But if you're thinking that removing the Log.x(..) actually removes the information the hackers need, you'll have a nasty surprise. Removing al...

Inside your layout, add a Login button with the following code: <com.twitter.sdk.android.core.identity.TwitterLoginButton android:id="@+id/twitter_login_button" android:layout_width="wrap_content" android:layout_height="wrap_content" and...