What's the difference between Object.is() and the triple equals operator in JavaScript?
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 (==
) 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:
{} === {}; // 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