function-bind

What is function-bind?

The function-bind npm package is a polyfill for Function.prototype.bind, which is a method in JavaScript used to create a new function that, when called, has its 'this' keyword set to the provided value. The bind method can also prepend a fixed set of arguments to the arguments passed to the bound function when it is called.

What are function-bind's main functionalities?

Binding a function to a context

This feature allows you to bind a function to a specific context, so that the 'this' keyword inside the function refers to the provided context object.

var bind = require('function-bind');

function greet() {
  return 'Hello, ' + this.name;
}

var context = { name: 'Alice' };
var boundGreet = bind.call(greet, context);

console.log(boundGreet()); // 'Hello, Alice'

Prepending arguments to the bound function

This feature allows you to create a new function by not only binding it to a context but also prepending arguments to it. When the new function is called, these arguments are passed in front of any other provided arguments.

var bind = require('function-bind');

function add(a, b) {
  return a + b;
}

var addOne = bind.call(add, null, 1);

console.log(addOne(2)); // 3

Other packages similar to function-bind

lodash.bind

lodash.bind is a method from the Lodash library that provides similar functionality to function-bind. It allows you to bind functions to a context and optionally prepend arguments. Lodash offers a more extensive set of utility functions, whereas function-bind focuses solely on the bind functionality.

README

function-bind

Implementation of function.prototype.bind

Example

I mainly do this for unit tests I run on phantomjs. PhantomJS does not have Function.prototype.bind :(

Function.prototype.bind = require("function-bind")

Installation

npm install function-bind

Contributors

• Raynos

MIT Licenced

Changelog

v1.1.0 - 2016-02-14

Commits

• Update eslint, tape; use my personal shared eslint config 9c9062a
• Add npm run eslint dd96c56
• [New] return the native bind when available. 82186e0
• [Dev Deps] update tape, jscs, eslint, @ljharb/eslint-config a3dd767
• Update eslint 3dae2f7
• Update tape, covert, jscs a181eee
• [Tests] up to node v5.6, v4.3 964929a
• Test up to io.js v2.1 2be7310
• Update tape, jscs, eslint, @ljharb/eslint-config 45f3d68
• [Dev Deps] update tape, jscs 6e1340d
• [Tests] up to io.js v3.3, node v4.1 d9bad2b
• Update eslint 935590c
• [Dev Deps] update jscs, eslint, @ljharb/eslint-config 8c9a1ef
• Test on io.js v2.2 9a3a38c
• Run travis-ci tests on iojs and node v0.12; speed up builds; allow 0.8 failures. 69afc26
• [Dev Deps] Update tape, eslint 36c1be0
• Update tape, jscs 98d8303
• Update jscs 9633a4e
• Update tape, jscs c80ef0f
• Test up to io.js v3.0 7e2c853
• Test on io.js v2.4 5a199a2
• Test on io.js v2.3 a511b88
• Fixing a typo from 822b4e1938db02dc9584aa434fd3a45cb20caf43 732d6b6
• Update jscs da52a48
• Lock covert to v1.0.0. d6150fd