Nodejs Number Iterate upto(t, cb)

Method Source Code

// Ruby = 1.upto(5) { |i| puts i }
// JS   = (1).upto(5, function(i){console.log(i);})
Number.prototype.upto = function(t, cb) {
  var i = this;// www  .  j  a  v  a 2s . c om
  if(t < this) return +this;
  while (i <= t) { cb(i++); }
  return +this;
};

Related

1. downto(down, iterator)

   Number.prototype.downto = function (down, iterator) {
     for (var i = this.valueOf(); i >= down; i--) {
       iterator(i);
     return this.valueOf();
   };
   

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;
   ...
   

6. downto(t, cb)

   Number.prototype.downto = function (t, cb) {
     var i = this;
     if(t > this) {
       return +this;
     while (i >= t) {
       cb(i--);
     return +this;
   ...
   

7. downto(t, cb)

   Number.prototype.downto = function(t, cb) {
     var i = this;
     if(t > this) return +this;
     while (i >= t) { cb(i--); }
     return +this;
   };
   

8. downto(to)

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