Object

`Object.is`

Determines whether two values are the same value using the SameValue algorithm

Syntax

JavaScript

Object.is(value1, value2)

Parameters

Parameter	Type	Description
value1	any	The first value to compare
value2	any	The second value to compare

Return Value

true if the values are the same, false otherwise

Examples

Basic Usage

console.log(Object.is(NaN, NaN)); // true (unlike ===)
console.log(NaN === NaN); // false

Practical Example

console.log(Object.is(0, -0)); // false (unlike ===)
console.log(0 === -0); // true

Advanced Usage

console.log(Object.is('foo', 'foo')); // true
console.log(Object.is(null, null)); // true
console.log(Object.is(undefined, null)); // false

Understanding Object.is

The Object.is method in JavaScript determines whether two values are the same value using the SameValue algorithm. It belongs to the Object object and is one of the most widely used methods for working with object values in modern JavaScript and TypeScript applications.

The method signature is Object.is(value1, value2). It accepts 2 parameters: value1, value2. When called, it returns true if the values are the same, false otherwise. Understanding when and how to use is() helps you write more expressive, readable code.

Common use cases for Object.is include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like object-keys, number-isnan, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for Object.is is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.