Object.is basic polyfill

objectis.js

if (!Object.is || true) {
  Object.is = function ObjectIs(x, y) {
    var xNegZero = isItNegZero(x);
    var yNegZero = isItNegZero(y);
    
    if(xNegZero || yNegZero) {
      return xNegZero && yNegZero;
    } else if (isItNaN(x) && isItNaN(y)) {
        return true;
    } else {
      return x === y;
    }
            
    function isItNegZero(v) {
      return v === 0 && (1/v) === -Infinity;
    }
    
    function isItNaN(v) {
      return v !== v;
    }
  }
}


console.log(Object.is(42,42) === true);
console.log(Object.is(NaN, NaN) === true);
console.log(Object.is(-0,-0) === true);
console.log(Object.is(42, "42") === false);