includes not working in Internet Explorer

Question

This code does not work in internet explorer  Any alternative    abcde  includes  cd

User · Answer

includes   is not supported by most browsers  Your options are either to use  -polyfill from MDN https   developer mozilla org en docs Web JavaScript Reference Global Objects String includes  or to use  -indexof     var str    abcde   var n   str indexOf  cd      Which gives you n 2  This is widely supported

User · Answer

You can do the same with    and   operators     var myString    this is my string        myString indexOf  string        - gt  true      myString indexOf  hello        - gt  false   here s the explanation of the two operators     and      What is the     not not  operator in JavaScript   https   www joezimjs com javascript great-mystery-of-the-tilde

User · Answer

String prototype includes is  as you write  not supported in Internet Explorer  or Opera    Instead you can use String prototype indexOf   indexOf returns the index of the first character of the substring if it is in the string  otherwise it returns -1   Much like the Array equivalent   var myString    this is my string   myString indexOf  string       - gt  11  myString indexOf  hello       - gt  -1   MDN has a polyfill for includes using indexOf  https   developer mozilla org en docs Web JavaScript Reference Global Objects String includes Polyfill  EDIT  Opera supports includes as of version 28   EDIT 2  Current versions of Edge supports the method   as of 2019

User · Answer

This one may be better and shorter   function stringIncludes a  b        return a indexOf b   gt   0

User · Answer

Problem   Try running below without solution  from Internet Explorer and see the result   x000D   x000D  console log  abcde  includes  cd     x000D   x000D   x000D    Solution   Now run below solution and check the result  x000D   x000D  if   String prototype includes     To check browser supports or not x000D    String prototype includes   function  str     If not supported  then define the method x000D      return this indexOf str      -1  x000D      x000D    x000D  console log  abcde  includes  cd     x000D   x000D   x000D

User · Answer

It works for me   function stringIncludes a  b          return a indexOf b      -1

User · Answer

I had the same problem when working in Angular 5  In order to make it work directly without writing a polyfill yourself  just add the following line to polyfills ts file   import  core-js es7 array    Also  tsconfig json lib section might be relevant    lib        es2017      dom

User · Answer

If you want to keep using the Array prototype include   in javascript you can use this script  github-script-ie-include That converts automatically the include   to the match   function if it detects IE   Other option is using always thestring match Regex expression

User · Answer

Or just put this in a Javascript file and have a good day      String prototype includes   function  str      var returnValue   false     if  this indexOf str      -1        returnValue   true         return returnValue

User · Answer

For react   import  react-app-polyfill ie11   import  core-js es5   import  core-js es6   import  core-js es7     Issue resolve for - includes    find    and so on

[javascript] .includes() not working in Internet Explorer

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