javascript中map((k,i))的k和i分别代表什么意思？

Question

想生成一个1,100的Array

  arr=[...Array(100)].map((k,i)=>i+1);
       console.log(arr);

问题：
(k,i)中的k和i分别代表什么意思？

Answer 1

Array.prototype.map

map(function(element, index) { /* ... */ })

callbackFn
Function that is called for every element of arr. Each time callbackFn executes, the returned value is added to newArray.

The callbackFn function accepts the following arguments:

• element
  The current element being processed in the array.
• index
  The index of the current element being processed in the array.
• array
  The array map was called upon.

....