component-bind

What is component-bind?

The component-bind npm package is a utility for binding functions to a specific context, ensuring that the 'this' keyword inside the function refers to the desired object. This is particularly useful in event handling and callback scenarios where the context can be lost.

What are component-bind's main functionalities?

Basic Function Binding

This feature allows you to bind a function to a specific context. In this example, the 'getValue' function is bound to the 'obj' object, ensuring that 'this' inside 'getValue' refers to 'obj'.

const bind = require('component-bind');

const obj = {
  value: 42,
  getValue: function() {
    return this.value;
  }
};

const boundGetValue = bind(obj, obj.getValue);
console.log(boundGetValue()); // 42

Event Handling

This feature is useful for event handling where the context can be lost. By binding 'handleClick' to 'obj', you ensure that 'this' inside 'handleClick' refers to 'obj' when the button is clicked.

const bind = require('component-bind');

const obj = {
  value: 42,
  handleClick: function() {
    console.log(this.value);
  }
};

const button = document.createElement('button');
button.addEventListener('click', bind(obj, obj.handleClick));
document.body.appendChild(button);

Other packages similar to component-bind

lodash.bind

Lodash is a popular utility library that provides a 'bind' function similar to component-bind. Lodash's 'bind' function offers more features, such as partial application of arguments, making it more versatile for complex use cases.

underscore

Underscore is another utility library that includes a 'bind' function. While it is similar to component-bind, Underscore's 'bind' function is part of a larger suite of functional programming utilities, making it a more comprehensive solution for developers who need additional functionality.

function-bind

The 'function-bind' package is a polyfill for the native Function.prototype.bind method. It provides similar functionality to component-bind but is designed to work in environments where the native 'bind' method is not available.

README

bind

Function binding utility.

Installation

$ component install component/bind

API

• bind(obj, fn)
• bind(obj, fn, ...)
• bind(obj, name)

bind(obj, fn)

should bind the function to the given object.

var tobi = { name: 'tobi' };

function name() {
  return this.name;
}

var fn = bind(tobi, name);
fn().should.equal('tobi');

bind(obj, fn, ...)

should curry the remaining arguments.

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

bind(null, add)(1, 2).should.equal(3);
bind(null, add, 1)(2).should.equal(3);
bind(null, add, 1, 2)().should.equal(3);

bind(obj, name)

should bind the method of the given name.

var tobi = { name: 'tobi' };

tobi.getName = function() {
  return this.name;
};

var fn = bind(tobi, 'getName');
fn().should.equal('tobi');

License

MIT