Find out all about the JavaScript is() method of the Object object
This method was introduced in ES2015. It aims to help comparing values.
Usage:
Object.is(a, b)
The result is always false
unless:
a
andb
are the same exact objecta
andb
are equal strings (strings are equal when composed by the same characters, in the same order)a
andb
are equal numbers (numbers are equal when their value is equal)a
andb
are bothundefined
, bothnull
, bothNaN
, bothtrue
or bothfalse
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).