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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..
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
x !== y
x !== y;
!(x === y);
, .
3 !== "3"; // true
"hello" !== "hello"; // false
"hello" !== "hola"; // true
3 !== 3; // false
3 !== 4; // true
true !== true; // false
true !== false; // true
null !== null; // false
"3" !== 3; // true
true !== 1; // true
null !== undefined; // true
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 |
This page was last modified on 17 . 2025 . by MDN contributors.
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