Range

range.js

const to = Symbol('number to')

// Number.prototype[to] = function to(end) {
//   let [start, tend, rev] = (this>end) ? [end, this, true] : [this, end, false], arr = []
//   for (let i=start; i<=tend; i++) arr.push(i)
//   return rev ? arr.sort(_=>1) : arr
// }

Number.prototype[to] = function to(end, {step}={step:this<=end?1:-1}) {
  let arr = [], i, d = end>this
  for (i=+this;d?(i<=end):(i>=end);i+=step) arr.push(i)
  return arr
}

console.log(1[to](11))