Nodejs Number Calculate subNum(n)

Method Source Code

Number.prototype.subNum = function(n){
   var f_x = parseFloat(this);
   if (isNaN(f_x)){
      return false;
   }/*from   ww w  .j  a  va2  s .c  om*/
   f_x = Math.floor(f_x*Math.pow(10,n)+0.0001)/Math.pow(10,n);
   var s_x = f_x.toString();
   var pos_decimal = s_x.indexOf('.');
   if (pos_decimal < 0){
      pos_decimal = s_x.length;
      s_x += '.';
   }
   while (s_x.length <= pos_decimal + n){
      s_x += '0';
   }
   return s_x;
}

function subNumFun(a,b){
   return a.subNum(b)
}

export {subNumFun}

Related

1. snap(resolution)

   Number.prototype.snap = function(resolution) {
     return Math.floor(this / resolution) * resolution;
   };
   

2. sqrt()

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

3. square()

   var expect = chai.expect;
   Number.prototype.square = function () {
       "use strict";
       return this * this;
   };
   

4. square()

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

5. step(to, add_remove_step)

   Number.prototype.step = function (to, add_remove_step) {
     var from = this.valueOf();
     var ch = add_remove_step.match(/[\+,\-]/g)[0];
     var i = from;
     var arr = [];
     if (ch === '+') {
       while (i <= to) {
         arr.push(i);
         i = i + parseInt(add_remove_step);
   ...
   

6. succ()

   Number.prototype.succ = function() {
       return this + 1;
   };
   

7. tan()

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

8. testNumber()

   function Number(){
     this.start = 20
     this.testNumber();
     this.answer = 1
   };
   Number.prototype.testNumber = function(){
     var i = 1;
     var start = this.start;
     while(i <= 20){
   ...
   

9. trim(a, b)

   Number.prototype.trim = function(a, b) {
     var min = Math.min(a, b),
         max = Math.max(a, b);
     return Math.min(Math.max(parseInt(this, 10), min), max);
   };