Learning JavaScript? Download my free JavaScript Handbook 🔥

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).



NEW

Follow my new project: From Zero to App

A video-based learning project where I create a React + GraphQL app from idea to deployment! 9 free videos already out!