Use of a JavaScript Array as an `iterable` in a `for-of` loop

array-iterable.js

const assert = require('assert')

const numbers = [0, 2, 4, 6, 8]

let sum = 0

// We can loop through “iterables” with the new “for-of” loop:
for (let n of numbers) {
  sum += n
}

assert.equal(sum, 20)