Nodejs Number Calculate discountPercentage(val)

Method Source Code

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

Related

1. countDecimals()

   Number.prototype.countDecimals = function () {
       if(Math.floor(this.valueOf()) === this.valueOf()) return 0;
       return this.toString().split(".")[1].length || 0; 
   

2. decimal(nb)

   Number.prototype.to_s       = function(){ return toString(this)     }
   Number.prototype.to_i       = function(){ return parseInt(this, 10) }
   Number.prototype.is_string  = function(){return false}
   Number.prototype.is_hash    = function(){return false}
   Number.prototype.is_array   = function(){return false}
   Number.prototype.is_number  = function(){return true}
   Number.prototype.decimal = function(nb) {
       if( this.toString().indexOf('.') === false ) return this ;
       m = Math.pow(10, nb) ;
   ...
   

3. 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();
   };
   

4. 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('.');
   ...
   

5. digits()

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

6. 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;
   ...
   

7. double()

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

8. doubleDigitalize()

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

9. equals(another)

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