Creating an array of results through a range: traditional mutation vs functional way.

ranges.js

const playDice = sides => 1 + Math.floor(Math.random() * sides)
const playSixSidedDice = () => playDice(6)

// Pushing to Results (Traditional For)
const playSixSidedDices = rollTimes => {
  let results = []
  for(let i = 0; i < rollTimes; i++) {
    results.push(playSixSidedDice())
  }
  return results
}

// Unchangeable Results (Map through an iterable Array of range indexes)
const range = i => [...Array(i).keys()]

const playSixSidedDices = rollTimes =>
  range(rollTimes).map(playSixSidedDice)

const results = playSixSidedDices(3)
// (example) results: [3, 4, 2]

Some alternatives using functional library for JavaScript:
Lodash: https://lodash.com/docs#range
Ramda: http://ramdajs.com/docs/#range

Alternative using Array.from:

Array.from({length: 5}, (v, i) => i);

MDN - full example