Generator as a Method

generatorMethod.js

class Range {
  constructor(start, stop=start) {
    if (start === undefined && stop === undefined) {
      throw 'usage: range(start, stop) or range(stop)';
    }

    if (stop === start) {
      start = 0;
    }

    if (stop < start) {
      throw 'usage: range(start, stop)';
    }

    this.start = start;
    this.stop = stop;
  }

  *[Symbol.iterator]() {
    for (let i = this.start; i <= this.stop; i += 1) {
      yield i;
    }
  }
}
 
const oneToTen = new Range(1, 10);
 
for (let n of oneToTen) {
  console.log(n);
}

/*
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10
*/