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What's the difference between Object.is() and the triple equals operator in JavaScript?
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Problem
If you want to check equality in JavaScript, there are two comparison operators, which are explained in depth in a previous article.
Very briefly, the double equals operator (
Here are some examples for additional clarity:
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:
Solution
{} === {}; // 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); // trueHere are some examples for additional clarity:
Code Snippets
{} === {}; // 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); // trueContext
From 30-seconds-of-code: object-is-triple-equals
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