Tutorial by Examples: d

Suppose we want to select a word without surrounding white spaces, use the text object iw for inner word using visual mode: Got to normal mode by pressing ESC Type viw at the beginning of a word This will select the inner word

In ASP.NET Core apps, you bundle and minify the client-side resources during design-time using third party tools, such as Gulp and Grunt. By using design-time bundling and minification, the minified files are created prior to the application’s deployment. Bundling and minifying before deployment p...

Visual Studio also features an available Bundler and Minifier Extension that is capable of handling this process for you. The extension allows you to easily select and bundle the files you need without writing a line of code. Building Your Bundles After installing the extension, you select all of ...

To run multiple processes e.g. an Apache web server together with an SSH daemon inside the same container you can use supervisord. Create your supervisord.conf configuration file like: [supervisord] nodaemon=true [program:sshd] command=/usr/sbin/sshd -D [program:apache2] command=/bin/bash...

uses System.Generics.Collections, { TArray } System.Generics.Defaults; { TComparer<T> } var StringArray: TArray<string>; { Also works with "array of string" } ... { Sorts the array case insensitive } TArray.Sort<string>(StringArray, TComparer<string>...

type TIntegerList = class(TList<Integer>) public function Sum: Integer; end; ... function TIntegerList.Sum: Integer; var Item: Integer; begin Result := 0; for Item in Self do Result := Result + Item; end;

Elm allows the definition of custom infix operators. Infix operators are defined using parenthesis around the name of a function. Consider this example of infix operator for construction Tuples 1 => True -- (1, True): (=>) : a -> b -> ( a, b ) (=>) a b = ( a, b ) Most of t...

Backbone models describe how data is stored using JavaScript objects. Each model is a hash of fields called attributes and the behaviour of the model including validation is described by options. A model of Todo item in a TodoApp would be var ToDo = Backbone.Model.extend({ defaults: { assi...

The easiest way to create a custom data type in Haskell is to use the data keyword: data Foo = Bar | Biz The name of the type is specified between data and =, and is called a type constructor. After = we specify all value constructors of our data type, delimited by the | sign. There is a rule in...

Value constructors are functions that return a value of a data type. Because of this, just like any other function, they can take one or more parameters: data Foo = Bar String Int | Biz String Let's check the type of the Bar value constructor. :t Bar prints Bar :: String -> Int -> Foo...

Type constructors can take one or more type parameters: data Foo a b = Bar a b | Biz a b Type parameters in Haskell must begin with a lowercase letter. Our custom data type is not a real type yet. In order to create values of our type, we must substitute all type parameters with actual types. Be...

A lot of Vim users find the Esc too hard to reach, and end up finding another mapping that's easy to reach from the home row. Note that Ctrl-[ may be equivalent to Esc on an English keyboard, and is much easier to reach. jk inoremap jk <ESC> This one is really easy to trigger; just smash...

IPv4 To match IPv4 address format, you need to check for numbers [0-9]{1,3} three times {3} separated by periods \. and ending with another number. ^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$ This regular expression is too simple - if you want to it to be accurate, you need to check that the numbers are be...

This is the normal HTML table structure <style> table { width: 100%; } </style> <table> <tr> <td> I'm a table </td> </tr> </table> You can do same implementation like this <style> .table-...

Redux is very functional, so unit testing is very straightforward. Action creator: export function showSidebar () { return { type: 'SHOW_SIDEBAR' } } Action creators unit test: import expect from 'expect' import actions from './actions' import * as type from './constants' desc...

Strict mode does not allow you to use duplicate function parameter names. function foo(bar, bar) {} // No error. bar is set to the final argument when called "use strict"; function foo(bar, bar) {}; // SyntaxError: duplicate formal argument bar

;Sends the keystroke for the letter "a" every 3 seconds. #Persistent SetTimer, SendLetterA, 3000 return SendLetterA() { Send, a }

This is an example of something that would have been straight up impossible with labels. If you execute the same label multiple times at the same time and they rely on variables that are being defined within them, they very likely interfere and cause unexpected behavior. Here is how to do it with f...

Consider the following example: type Company struct { Name string Location string } Hide/Skip Certain Fields To export Revenue and Sales, but hide them from encoding/decoding, use json:"-" or rename the variable to begin with a lowercase letter. Note that this prevents ...

Pipe operators are used to pass parameters to a function in a simple and elegant way. It allows to eliminate intermediate values and make function calls easier to read. In F#, there are two pipe operators: Forward (|>): Passing parameters from left to right let print message = print...