JavaScript (ES2026) reference · Object Methods

JavaScript Object.is() Method

Compare two values like === but treat NaN as equal to NaN and +0 as different from -0.

JavaScript (ES2026) Since ES2015

Create a free account to save this page, take notes and track your progress. Sign in

Syntax

Object.is(value1, value2)

Parameter	Description
`value1, value2`	The values to compare.

true or false.

The two differences from ===Try it yourself

console.log(NaN === NaN, Object.is(NaN, NaN));
console.log(0 === -0, Object.is(0, -0));

Output

false true
true false

Objects still compare by referenceTry it yourself

console.log(Object.is({}, {}), Object.is("a", "a"));

Output

false true

Version	Change
JavaScript ES2015	Added

array.includes() · Return true if the array contains a value, using SameValueZero equality (so it finds NaN, unlike indexOf).
JavaScript Objects · tutorial