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snippets/javascript-object-is-triple-equals.md

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+---
+title: What's the difference between Object.is() and the triple equals operator in JavaScript?
+shortTitle: Object.is() vs triple equals operator
+type: question
+tags: [javascript,object,type]
+author: chalarangelo
+cover: rocky-mountains
+excerpt: "`Object.is()` and the triple equals operator (`===`) can both be used for equality checking in JavaScript, but when should you use each one?"
+dateModified: 2021-06-12T19:30:41+03:00
+---
+
+If you want to check equality in JavaScript, there are two comparison operators, which are explained in depth in a previous [article](/blog/s/javascript-equality).
+
+Very briefly, the double equals operator (`==`) only compares value whereas the triple equals operator (`===`) compares both value and type. But there is also a third option, `Object.is()`, which behaves the same as the triple equals operator with the exception of `NaN` and `+0` and `-0`.
+
+Here are some examples for additional clarity:
+
+```js
+{} === {}; // false
+Object.is({}, {}); // false
+
+1 === 1; // true
+Object.is(1, 1); // true
+
++0 === -0; // true
+Object.is(+0, -0); // false
+
+NaN === NaN; // false
+Object.is(NaN, NaN); // true
+```