Nodejs Number Calculate equals(another)

Method Source Code

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

Related

1. digits()

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

2. discountPercentage(val)

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

3. 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;
   ...
   

4. double()

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

5. doubleDigitalize()

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

6. exp()

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

7. 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
   ...
   

8. fillZero(len)

   Number.prototype.fillZero = function (len)
     var s = this.toString(10);
     while (s.length<len) s = "0" + s;
     return s;
   

9. firstDigit()

   Number.prototype.firstDigit = Number.prototype.firstDigit || function () {
     let number = this;
     while (number >= 10) {
       number = Math.floor(number / 10);
     return number;
   };