JavaScript: Object.is

New in JS2015.

Object.is(value1, value2)

similar to value1 === value2, except when values are signed zeroes and NaN . [see Equality]

console.log(Object.is(-0, +0) === false);
console.log(-0 === +0);

console.log(Object.is(NaN, NaN));
console.log((NaN === NaN) === false);