Squares.js

var squaresTo = (limit) => {
  var iterator = {
    value: 1,
    nextDelta: 3,
    done: false,
    next: () => {
      return {
        value: this.value + this.nextDelta,
        nextDelta: this.nextDelta + 2,
        done: (this.value + this.nextDelta) <= limit,
        next: this.next,
      }      
    }
  }
}

var test = [ ...squaresTo(100) ]