The call-bind npm package is a utility that allows you to use the ECMAScript 5 .call and .apply methods with a fixed this value. It is particularly useful when you want to ensure that the context (the this value) of a function call is bound to a specific object, regardless of how the function is invoked. This can be helpful in functional programming and when dealing with higher-order functions that might change the context of a function call.

What are call-bind's main functionalities?

callBind

Provides a way to use the native call method in a bound fashion, ensuring the this value is fixed when invoking a function.

const callBind = require('call-bind');
const call = callBind.call;
const unboundSlice = Array.prototype.slice;
const slice = call(unboundSlice);

function example() {
  const args = slice(arguments);
  console.log(args);
}

example(1, 2, 3); // Logs: [1, 2, 3]

applyBind

Allows you to use the native apply method in a bound manner, similar to callBind but for functions that expect an array of arguments.

const callBind = require('call-bind');
const apply = callBind.apply;
const unboundForEach = Array.prototype.forEach;
const forEach = apply(unboundForEach);

function example(array, callback) {
  forEach(array, callback);
}

example([1, 2, 3], function(element) { console.log(element); }); // Logs: 1, 2, 3

Other packages similar to call-bind

Changelog

Source

v1.0.2 - 2021-01-11

Commits

[Fix] properly include the receiver in the bound length dbae7bc

Readme

Source

call-bind

Robustly .call.bind() a function.

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Last updated on 11 Jan 2021

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