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

Readme

Source

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

Keywords

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Last updated on 28 Aug 2017

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