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(!==) - JavaScript | MDN

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(!==)

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..

(!==) , , . .

In this article

console.log(1 !== 1);
// Expected output: false

console.log("hello" !== "hello");
// Expected output: false

console.log("1" !== 1);
// Expected output: true

console.log(0 !== false);
// Expected output: true

js
x !== y

, , . :

js
x !== y;

!(x === y);

.

, .

js
3 !== "3"; // true

js
"hello" !== "hello"; // false
"hello" !== "hola"; // true

3 !== 3; // false
3 !== 4; // true

true !== true; // false
true !== false; // true

null !== null; // false

js
"3" !== 3; // true
true !== 1; // true
null !== undefined; // true

js
const object1 = {
  key: "value",
};

const object2 = {
  key: "value",
};

console.log(object1 !== object2); // true
console.log(object1 !== object1); // false

Specification
ECMAScript 2027 LanguageSpecification
# sec-equality-operators


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