Nodejs Number Value Check even()

Method Source Code

var puts = require("sys").puts;

Number.square = function(n) {
  return n * n// www. j a v  a 2s . c om
}

Number.even = function(n) {
  return n % 2 == 0
}

Number.odd = function(n) {
  return !this.even(n)
}

Number.prototype.even = function() {
  return this.constructor.even(this)
}

Number.prototype.odd = function() {
  return this.constructor.odd(this)
}

Array.prototype.sortAsc = function() {
  return this.sort(function(x, y){
    if(x < y) {
      return -1
    } else if(y < x) {
      return 1
    } else {
      return 0
    }
  })
}

Array.prototype.sortDesc = function() {
  return this.sort(function(x, y){
    if(x < y) {
      return 1
    } else if(y < x) {
      return -1
    } else {
      return 0
    }
  })
}

puts([2,1,4,3].map(Number.square).filter(Number.even).sortDesc())

Related

1. odd()

   Number.prototype.odd = function(){
     return ( ( this % 2 ) == 1 )
   

2. isBetween(l,h)

   Number.prototype.isBetween = function(l,h){
     return (this >= l.val() && this <= h.val());
   

3. isBetween(min, max, inclusive)

   Number.prototype.isBetween = function (min, max, inclusive) {
     return inclusive
       ? this >= min && this <= max
       : this > min && this < max;
   };
   

4. isBetweenisBetween(a, b)

   Number.prototype.isBetween = function isBetween(a, b) {
     if(a <= this) {
       return this <= b;
     return this >= b;
   

5. even()

   Number.prototype.even = function(){
       return (this % 2 === 0);
   };
   

6. isNumber()

   String.prototype.isNumber = function(){
     return !isNaN(this);
   };
   

7. isNumber()

   String.prototype.isNumber = function(){
     var pattern=/^[+\-]?\d+(.\d+)?$/;
     flag=pattern.test(this);
     if(flag) return true;
     return false;
   

8. isNumber()

   String.prototype.isNumber = function (){
       var str = this;
       return !isNaN(str);
   

9. isNumber()

   String.prototype.isNumber = function()
     return (/^\d+$/.test(this.Trim()));