Nodejs Number Calculate decimal(nb)

Method Source Code

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) ;//from  w ww.ja v a2s  . c  om
    return parseInt(this * m, 10) / m ;
}

Related

1. timesTwo(x)

   var x = new Number(2);
   console.log(x);
   Number.prototype.timesTwo = function(x){
     return x * 2;
   };
   console.log(x.timesTwo(x));
   console.log(Number.isNaN(x));
   Number.isInteger = Number.isInteger || function(x){
     return typeof x === "number" &&
   ...
   

2. clone(handler)

   Number.prototype.clone = function(handler) {
     return new this.constructor(this);
   };
   

3. concat(value)

   Number.prototype.concat = Number.prototype.concat || function (value) {
     let number = this;
     let digits = exports.digitLength(value);
     number *= Math.pow(10, digits);
     return number + value;
   };
   

4. cos()

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

5. countDecimals()

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

6. 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();
   };
   

7. 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('.');
   ...
   

8. digits()

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

9. discountPercentage(val)

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