let and const in loop heads

[Ivan Yan]

9.5.1 for loop

const works like var, but you can't change the initial value of a const-declared variable.

I think here should be 'const works like let'.

9.5.2 for-of loop and for-in loop

let arr = [];
for (let i of [0, 1, 2]) {
    arr.push(() => i);
}
arr.map(x => x()); // [0,1,2]

In latest firefox developer edition, the result is [2, 2, 2]. 

in the latest Chrome dev, the result is expected:

(function () {
  'use strict'


  let arr = []
  for (let i of [0, 1, 2]) {
    arr.push(function () {
      return i
    })
  }


  let r = arr.map(function (x) {
    return x()
  })


  console.log(r) // [0, 1, 2]
}())