The Object is() method

This method was introduced in ES2015. It aims to help comparing values.

Usage:

Object.is(a, b)

The result is always false unless:

• a and b are the same exact object
• a and b are equal strings (strings are equal when composed by the same characters, in the same order)
• a and b are equal numbers (numbers are equal when their value is equal)
• a and b are both undefined, both null, both NaN, both true or both false

0 and -0 are different values in JavaScript, so pay attention in this special case (convert all to +0 using the + unary operator before comparing, for example).

More js tutorials:

• How to use Async and Await with Array.prototype.map()
• The ES6 Guide
• JavaScript Function Parameters
• How to send the authorization header using Axios
• How to style DOM elements using JavaScript
• A Moment.js tutorial
• Wait for all promises to resolve in JavaScript
• The Object defineProperty() method
• How to force credentials to every Axios request