Nice, quick and easy range functions for your ES6 day-to-day

ranges.ts

// MIT License
//
// Copyright (c) 2022 Daniel Cousens
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// SOFTWARE.

// option 1
function* sequence (a, b) {
  while (a < b) yield a++
}

// option 2
function* sequence (from, to, step = 1) {
  while (from < to) {
    yield from;
    from += step
  }
}

// option 3
function* sequence (from, to, step = 1) {
  for (let i = from; i < to; i += step) yield i
}

for (const i of seq(0, 100)) {
  console.log(i)
}