Tutorial by Examples: u

.gitignore ignores files locally, but it is intended to be committed to the repository and shared with other contributors and users. You can set a global .gitignore, but then all your repositories would share those settings. If you want to ignore certain files in a repository locally and not make t...

In Elixir, a common practice is to use anonymous functions. Creating an anonymous function is simple: iex(1)> my_func = fn x -> x * 2 end #Function<6.52032458/1 in :erl_eval.expr/5> The general syntax is: fn args -> output end For readability, you may put parenthesis around t...

create table empl ( name text primary key, boss text null references name on update cascade on delete cascade default null ); insert into empl values ('Paul',null); insert into empl values ('Luke','Paul'); insert into empl values ('Kate'...

Public Module Usage Public Sub LikeThis() Dim iCount As Integer Dim sCount As String iCount = 245 sCount = iCount.PadLeft(4, "0") Console.WriteLine(sCount) Console.ReadKey() End Sub End Module Public Module Padding <Extension> Pub...

A metatable defines a set of operations which alter the behaviour of a lua object. A metatable is just an ordinary table, which is used in a special way. local meta = { } -- create a table for use as metatable -- a metatable can change the behaviour of many things -- here we modify the 'tostrin...

Some metamethods don't have to be functions. To most important example for this is the __index metamethod. It can also be a table, which is then used as lookup. This is quite commonly used in the creation of classes in lua. Here, a table (often the metatable itself) is used to hold all the operation...

To create a background session // Swift: let mySessionID = "com.example.bgSession" let bgSessionConfig = NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier(mySessionID) let session = NSURLSession(configuration: bgSessionConfig) // add tasks here //...

Ionic Framework A Cross-platform mobile application development framework using Angular JS and Front End web technologies. Official website: http://ionicframework.com/ Documentation: http://ionicframework.com/docs/ Installation and Setup Installation Ionic required NPM(Node Package Manager) an...

import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingUtilities; import javax.swing.WindowConstants; /** * A very simple Swing example. */ public class SwingExample { /** * The number of times the ...

You can create a new branch and switch to it using git checkout -b AP-57 After you use git checkout to create a new branch, you will need to set that upstream origin to push to using git push --set-upstream origin AP-57 After that, you can use git push while you are on that branch.

3D transforms can be use to create many 3D shapes. Here is a simple 3D CSS cube example: HTML: <div class="cube"> <div class="cubeFace"></div> <div class="cubeFace face2"></div> </div> CSS: body { perspective-origin: 5...

import std.format; void main() { string s = "Name Surname 18"; string name, surname; int age; formattedRead(s, "%s %s %s", &name, &surname, &age); // %s selects a format based on the corresponding argument's type } Official documentatio...

SQL Server 2012 You can utilize the new function: FORMAT(). Using this you can transform your DATETIME fields to your own custom VARCHAR format. Example DECLARE @Date DATETIME = '2016-09-05 00:01:02.333' SELECT FORMAT(@Date, N'dddd, MMMM dd, yyyy hh:mm:ss tt') Monday, September 05, 2016 ...

The Windows API documentation for functions taking one or more string as argument will usually look like this: BOOL WINAPI CopyFile( _In_ LPCTSTR lpExistingFileName, _In_ LPCTSTR lpNewFileName, _In_ BOOL bFailIfExists ); The datatype for the two string parameters is made of several ...

When you have an input with well defined boundaries and are expecting more than one match in your string, you have two options: Using lazy quantifiers; Using a negated character class. Consider the following: You have a simple templating engine, you want to replace substrings like $[foo] whe...

[^0-9a-zA-Z] This will match all characters that are neither numbers nor letters (alphanumerical characters). If the underscore character _ is also to be negated, the expression can be shortened to: [^\w] Or: \W In the following sentences: Hi, what's up? I can't wait for 2017!...

To get version 5394 use: svn co --revision r5394 https://svn.example.com/svn/MyRepo/MyProject/trunk Or the shorter version: svn co -r 5394 https://svn.example.com/svn/MyRepo/MyProject/trunk Or by using pegged revisions: svn co https://svn.example.com/svn/MyRepo/MyProject/trunk@5394 If al...

If you have an instance of a generic type but for some reason don't know the specific type, you might want to determine the generic arguments that were used to create this instance. Let's say someone created an instance of List<T> like that and passes it to a method: var myList = new List&lt...

SequenceEqual is used to compare two IEnumerable<T> sequences with each other. int[] a = new int[] {1, 2, 3}; int[] b = new int[] {1, 2, 3}; int[] c = new int[] {1, 3, 2}; bool returnsTrue = a.SequenceEqual(b); bool returnsFalse = a.SequenceEqual(c);

Suppose we want to receive a function as a parameter, we can do it like this: function foo(otherFunc: Function): void { ... } If we want to receive a constructor as a parameter: function foo(constructorFunc: { new() }) { new constructorFunc(); } function foo(constructorWithParams...