Object.is() vs ===

Difference

Object.is() behaves the same as === (strict equality operator) except for NaN, +0 and -0.

+0 === -0; // true
Object.is(+0, -0); // false

NaN === NaN; // false
Object.is(NaN, NaN); // true

Number.NaN === Number.NaN; // false
Object.is(Number.NaN, Number.NaN); // true

NaN === Number.NaN; // false
Object.is(NaN, Number.NaN); // true