How to polyfill with native code in IE11?

Question

As we all know that IE does not support Array.prototype.includes method, so it should log 'undefined' with Array.protopetype.includes.

However, open I open an app in IE which was built with vue-cli, and I tried to log ' Array.prototype.includes' in console, it unexpectedly log the 'native code', which means that the includes methods now was nativly supported!

Out of my perception，it should log something like function(){....}

but how could it log 'native code'?I've googled that, but found nothing relative.Online link was showned here: https://gaoshijun1993.github.io/，you can test it with IE

user_8902065 · Answer

Here is the code I used:

 if (!Array.prototype.includes) //Dirty-fix za starije preglednike koji ne podrzavaju JavaScript naredbu Array.includes (kao sto je Internet Explorer 6).
                Array.prototype.includes = function (x)
                {
                    for (var i = 0; i < this.length; i++)
                        if (this[i] == x)
                            return true;
                    return false;
                }

Here is the full program:

https://github.com/FlatAssembler/ArithmeticExpressionCompiler/blob/master/compiler.html

How to polyfill with native code in IE11?

1 Answers