empty

Utility that provides different types of empty objects. All objects returned by this library are immutable (made so using Object.freeze) unless the NODE_ENV environment variable is set to 'production'.

Installation

The library is written for CommonJS environments such as Node and works beautifully in the browser using something like Browserify.

To install, make sure you have Node installed, then, in your project directory, run:

$ npm install empty

API

var empty = require('empty');

empty.object

var emptyObject = empty.object;

// or

var emptyObject = require('empty/object');

console.log(emptyObject);
// {}

empty.array

var emptyArray = empty.array;

// or

var emptyArray = require('empty/array');

console.log(emptyArray);
// []

empty.func

var emptyFunction = empty.func;

// or

var emptyFunction = require('empty/function');

console.log(emptyFunction);
// function () {}

empty.functionThatReturns

var functionThatReturns = empty.functionThatReturns;

// or

var functionThatReturns = require('empty/functionThatReturns');

console.log(functionThatReturns('foo')());
// 'foo'

empty.functionThatReturnsTrue

var functionThatReturnsTrue = empty.functionThatReturnsTrue;

// or

var functionThatReturnsTrue = require('empty/functionThatReturnsTrue');

console.log(functionThatReturnsTrue());
// true

empty.functionThatReturnsFalse

var functionThatReturnsFalse = empty.functionThatReturnsFalse;

// or

var functionThatReturnsFalse = require('empty/functionThatReturnsFalse');

console.log(functionThatReturnsFalse());
// false

empty.functionThatReturnsNull

var functionThatReturnsNull = empty.functionThatReturnsNull;

// or

var functionThatReturnsNull = require('empty/functionThatReturnsNull');

console.log(functionThatReturnsNull());
// null

empty.functionThatReturnsThis

var functionThatReturnsThis = empty.functionThatReturnsThis;

// or

var functionThatReturnsThis = require('empty/functionThatReturnsThis');

console.log(functionThatReturnsThis.call({a: 1}));
// {a: 1}

empty.functionThatReturnsArgument

var functionThatReturnsArgument = empty.functionThatReturnsArgument;

// or

var functionThatReturnsArgument = require('empty/functionThatReturnsArgument');

console.log(functionThatReturnsArgument('foo'));
// 'foo'

Credits

Many thanks to Arturo for the name on NPM. The original package repository can be found at here.