How to implement native map in js

JS native method map implementation, the code is as follows:

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Supplementary knowledge points :

We usually use the encapsulated map method. If we encapsulate a map ourselves, how should we implement it.

The basic principle remains unchanged. In fact, the core of traversing an array is the for loop. Therefore, a map method is encapsulated below.

The ideas are as follows:

1. Add a method to the prototype

2. Pass a function and this

3. The parameters passed by the call method are the same as those of the encapsulated map method.

Array.prototype.fakeMap = function(fn,context) { let arr = this; let temp = []; for(let i=0;i
        

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