Nodejs Number Iterate downto(down, iterator)

Method Source Code

Number.prototype.downto = function (down, iterator) {
  for (var i = this.valueOf(); i >= down; i--) {
    iterator(i);//  ww w . j  a v  a  2 s  . com
  }
  return this.valueOf();
};

Related

1. __iterator__(iterKeys)

   "use strict";
   Number.prototype.__iterator__ = function (iterKeys) {
     if (this % 1) {
       throw new TypeError("Integer expected for number iterator");
     var i = 1 - iterKeys,
         j = this + i;
     if (j < 0) {
       i = j - i + iterKeys;
   ...
   

2. iters()

   Number.prototype.iters = function () {
       return [(this for (x of [0])),
               (this for (y of [0]))];
   };
   var [a, b] = (3).iters();
   var three = a.next();
   assertEq(Object.prototype.toString.call(three), '[object Number]');
   assertEq(+three, 3);
   assertEq(b.next(), three);
   ...
   

3. upto(up, iterator)

   Number.prototype.upto = function (up, iterator) {
     for (var i = this.valueOf(); i <= up; i++) {
       iterator(i);
     return this.valueOf();
   };
   

4. upto(from)

   Number.prototype.upto = function (from) {
     var a = [];
     var to = this.valueOf();
     var i = to - 1;
     while (i++ < from) {
       a.push(i);
     return a;
   };
   ...
   

5. upto(t, cb)

   Number.prototype.upto = function (t, cb) {
     var i = this;
     if(t < this) {
       return +this;
     while (i <= t) {
       cb(i++);
     return +this;
   ...