Nodejs Number Calculate double()

Method Source Code

Number.prototype.double = function() {
  return this * 2;
};

Related

1. decimalPlaces(digits)

   Number.prototype.decimalPlaces = function(digits) {
       var re = new RegExp("(\\d+\\.\\d{" + digits + "})(\\d)"),
           m = this.toString().match(re);
       return m ? parseFloat(m[1]) : this.valueOf();
   };
   

2. decorateFloat(decimals, decSeparator)

   Number.prototype.decorateFloat = function (decimals, decSeparator) {
     if(decSeparator == undefined)
       decSeparator = '.';
     var price = this;
     var decPattern = '';
     for(var i = 0; i < decimals; i++)
       decPattern += '0';
     price = price.roundFloat(decimals);
     var split = price.toString().split('.');
   ...
   

3. digits()

   Number.prototype.digits = function() {
       return (Math.floor(this)+"").replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,");
   };
   

4. discountPercentage(val)

   Number.prototype.discountPercentage = function(val){
     return this - this.percentage(val);
   };
   

5. div10()

   Number.prototype.div10 = function () {
     return this/10;
   Object.prototype.say = function (s) {
    console.log('I say ' + s);
   var o = {};
   o.say("Hello");
   var n = 120;
   ...
   

6. doubleDigitalize()

   "use strict";
   Number.prototype.doubleDigitalize = function() {
     const numberString = this.toString();
     return numberString.length < 2 ? "0" + numberString : numberString;
   };
   

7. equals(another)

   Number.prototype.equals = function (another) {
       return this - another === 0;
   };
   

8. exp()

   Number.prototype.exp = function() {
     return Math.exp(this);
   };
   

9. fe(x)

   Number.prototype.fe = function(x)
     var s = x.toString();
     var point = s.search(/\./);
     if (point == -1)
       return (Math.abs(this - x) < 0.5);    
     else
   ...