includes() not working in all browsers

Question

right here is a block of my code. It works perfect in fireFox and Chrome. But not in IE. I get the error \"Object doesn\'t support property or method \'includes\'

Answer 1

IE11 does implement String.prototype.includes so why not using the official Polyfill?

Source: polyfill source

  if (!String.prototype.includes) {
    String.prototype.includes = function(search, start) {
      if (typeof start !== 'number') {
        start = 0;
      }

      if (start + search.length > this.length) {
        return false;
      } else {
        return this.indexOf(search, start) !== -1;
      }
    };
  }