31 lines
1.3 KiB
Markdown
31 lines
1.3 KiB
Markdown
---
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title: What's the difference between Object.is() and the triple equals operator in JavaScript?
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type: question
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tags: javascript,object,type
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authors: chalarangelo
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cover: blog_images/rocky-mountains.jpg
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excerpt: "`Object.is()` and the triple equals operator (`===`) can both be used for equality checking in JavaScript, but when should you use each one?"
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---
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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).
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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`.
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Here are some examples for additional clarity:
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```js
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{} === {}; // false
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Object.is({}, {}); // false
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1 === 1; // true
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Object.is(1, 1); // true
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+0 === -0; // true
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Object.is(+0, -0); // false
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NaN === NaN; // false
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Object.is(NaN, NaN); // true
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```
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**Image credit:** [Jonathan Sanchez](https://unsplash.com/@jonathansancheziam?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText) on [Unsplash](https://unsplash.com?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText)
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