Questions tagged [require]

Require in PHP

In PHP there exist the statements include() and require() to include another file with PHP-code into your document.
The difference to include is, that require will throw an error if the file is not available.

A variant of require() is require_once(). This includes a file only, if it hasn't already been included before.

require('/path/to/script.php');

Require in Ruby

In Ruby, the require method does what include does in most other programming languages: It will include and run another file.

It also tracks what you've required in the past and won't require the same file twice. To run another file without this added functionality, you can use the load method.

require '/path/to/script.rb'

The include and require methods do very different things. Please check the source for further information on include.

Source: http://ruby.about.com/b/2008/10/23/a-quick-peek-at-ruby-include-vs-require.htm

Require in JavaScript

JavaScript has no native support for the require statement. However, there exist various implementations that try to mimic the behaviour of other programming languages.

These implementations are not fixed to use the word "require" for their loading routines, but may use other statements.

Some of them are:

• CommonJS

const someModule = require('/path/to/module.js');

• RequireJS

    require(["moduleA", "moduleB"], function(A, B) {
       // do something with moduleA ...
       A.doSomething();
       // do something with moduleB ...
       B.doSomething();
    });

• Head JS

    head.js("/path/to/script.js");

• LABjs

    $LAB.script("/path/to/script.js");

Require in Lua

The require statement of Lua searches for a module with the given name automatically extended by a previously defined path pattern.

The path patterns are rules that specify how to construct a path name using the parameter given to require. After path construction, require will check if one of the constructed paths is valid in order to load this path.

The pattern usually includes an expression, which extends the given name by '.lua', Lua caches already loaded modules, so they won't be loaded twice.

    require "module"