Nodejs Number Check isInRangeisInRange(lower, upper)

Method Source Code

(function(){/* w w w. j a va 2  s.  co  m*/
"use strict";

/**
 * prototype-extension for Number
 *
 **/

Number.prototype.isInRange = function isInRange(lower, upper){
   /**
    * Function Number.prototype.isInRange
    * @name: Number.prototype.isInRange
    * @version: 0.9
    * @author: Korbinian Kapsner
    * @last modify: 04.08.2009
    * @description: ?erpr?b die Zahl in einem bestimmten Bereich liegt
    * @parameter:
    *   lower: untere Grenze
    *   upper: obere Grenze
    *
    */

   if (this >= lower && this <= upper){
      return true;
   }
   if (this <= lower && this >= upper){
      return true;
   }
   return false;
};

Related

1. isMultipleof(num)

   Number.prototype.isMultipleof = function (num) {
     if (this % num === 0) {
       return true;
     return false;
   var result = 0;
   for (var i = 1; i < 1000; i++) {
     if (i.isMultipleof(3) || i.isMultipleof(5) ) {
   ...
   

2. isNegativeZero()

   Number.prototype.isNegativeZero = function() {
     var n = this;
     return n === 0 && (((n = +n) || (1 / n)) < 0);
   

3. isPalindrome()

   Number.prototype.isPalindrome = function() {
     return this == this.reverse();
   var max = 0
     , x;
   for (var i = 100; i < 999; i++) {
     for (var j = i; j < 999; j++) {
       x = i * j;
       if (x.isPalindrome() && x > max) {
   ...
   

4. isPerfPow(nroot)

   Number.prototype.isPerfPow = function(nroot){
     var primes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53];
     var root,log2,t;
     t = Math.abs(this);
     log2 = Math.floor(Math.log(t)/Math.LN2);
     if(this.isPow2()) return true;
     root = Math.round(Math.sqrt(t));
     if(t - (root * root) == 0){
       if(arguments.length  > 0){
   ...