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).

Download my free JavaScript Beginner's Handbook!

Check out my in-depth, practical Web Development Courses!

(all 50% off with the coupon code POSITIVEVIBRATIONS)

⤴️⤴️⤴️

And signup to my upcoming JavaScript Bootcamp!

⤴️⤴️⤴️