No for or while loops.

noLoops.js

// pushOne(10,[]) results in [1,2,3,4,5,6,7,8,9,10]
// Imperative Programming
  function pushOne(max, indexes) {
    while (indexes.length < max) {
      indexes.push(indexes.length+1)
    }
    return indexes
  }
// Functional, Declarative Programming
  function pushOne(max, indexes) {
    const newIndexes =  [...indexes, indexes.length+1]
    return indexes.length < max ? pushOne(max, newIndexes) 
    : newIndexes
  }
// One Liner
  const pushOne = (max, indexes) => indexes.length < max ? 
  pushOne(max, [...indexes, indexes.length+1]) 
  : indexes
/**
 * The second one is doing the first function in a functional/immutable way
 * This is how one would program it in Elixir or Haskell.
 * They both run at the same speed. Its just different philosophies. 
 * I prefer not using for-loops at all.
 **/