IE does not support Array includes or String includes methods

Question

I have been working on a project and developing a JavaScript framework. The original code is about 700 lines so I only pasted this line. The includes method doesn\'t work on

Answer 1

Because it's not supported in IE, it is not supported also in Opera (see the compatibility table), but you can use the suggested polyfill:

Polyfill

This method has been added to the ECMAScript 2015 specification and may not be available in all JavaScript implementations yet. However, you can easily polyfill this method:

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

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

Answer 2

This Selected answer is for String, if you are looking for 'includes' on an array, I resolved my issue by adding the following to my polyfills.ts file:

import 'core-js/es7/array';

Answer 3

var includes = function(val, str) {
  return str.indexOf(val) >= 0;
};

Answer 4

if (fullString.indexOf("partString") >= 0) {
//true 

} else {
//false
}

Answer 5

@Infer-on shown great answer, but it has a problem in a specific situation. If you use for-in loop it will return includes "includes" function you added.

Here is another pollyfill.

if (!Array.prototype.includes) {
  Object.defineProperty(Array.prototype, "includes", {
    enumerable: false,
    value: function(obj) {
        var newArr = this.filter(function(el) {
          return el == obj;
        });
        return newArr.length > 0;
      }
  });
}

Answer 6

You could just use .search() > -1 which behaves in the exact same way. http://www.w3schools.com/jsref/jsref_search.asp

if ((row_cells[i]+"").search("#Eval(" + k + ")") > -1) {