JavaScript endsWith is not working in IEv10?

Question

I'm trying to compare two strings in JavaScript using endsWith(), like

var isValid = string1.endsWith(string2);

It's working fine in Google Chrome and Mozilla. When comes to IE it's throwing a console error as follows

SCRIPT438: Object doesn't support property or method 'endsWith' 

How can I resolve it?

Answer 1

Method endsWith() not supported in IE. Check browser compatibility here.

You can use polyfill option taken from MDN documentation:

if (!String.prototype.endsWith) {
  String.prototype.endsWith = function(searchString, position) {
      var subjectString = this.toString();
      if (typeof position !== 'number' || !isFinite(position) 
          || Math.floor(position) !== position || position > subjectString.length) {
        position = subjectString.length;
      }
      position -= searchString.length;
      var lastIndex = subjectString.indexOf(searchString, position);
      return lastIndex !== -1 && lastIndex === position;
  };
}

Answer 2

I found the simplest answer,

All you need do is to define the prototype

 if (!String.prototype.endsWith) {
   String.prototype.endsWith = function(suffix) {
     return this.indexOf(suffix, this.length - suffix.length) !== -1;
   };
 }