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

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