Nodejs Factorial Number Get factorial()

Method Source Code

Number.prototype.factorial = function() { 
   if (this <= 1) return 1;
   var n = this;/*from   w  ww.  j a v  a  2s.com*/
   var sum = n;
   
   while(n > 1) sum *= --n;
   
   return sum;
};

Related

1. factorial()

   Number.prototype.factorial = function() { 
       var n = 1;
       for(var i = 2; i <= this; i++)
           n*=i; 
       return n;
   Number.prototype.permutation = function(r) { 
       return (this.factorial() / (this-r).factorial())
   function permutate(p) {
       var states = new Number(p.length)
       console.log( states.permutation(states) )
   function proofRow(n, pvar, rule ) {
     var s = n + "\t" + pvar + "\t" + rule
     console.log(s)
   module.exports = {
     chat: function chat() {
       var argsv = chat.arguments
       var s=""
       for(var ea in argsv) {
         if(argsv[ea] != undefined)
           s += argsv[ea] + " " 
       console.log(s)
     },
     solidify: function solidify(ary) {
     for(var i in ary) {
       if(ary[i] == undefined || ary[i] == '')
         ary.splice(i,1)
     return ary
   };