python range function for js

range.js

function* range (...args) {
  if (args.length === 0) throw new Error('too few parameters')
  if (args.length === 1) args.unshift(undefined) // start = 0, stop

  const [start = 0, stop, step = 1] = args
  for (let k = start; (stop - k) * step > 0; k += step) yield k
}

// [...range(3)] === [0, 1, 2]
// [...range(-5, -1)] === [-5, -4, -3, -2]
// [...range(42, 32, -2)] === [42, 40, 38, 36, 34]