Nodejs Number Calculate sigFig(precision)

Method Source Code

'use strict'/*from  w ww  .  j ava2 s  .  c om*/

Number.prototype.sigFig = function(precision){
    if( !precision ) precision = 2;
    var d = Math.pow(10, precision);
    return ( parseInt( this.valueOf() * d) / d ).toFixed(precision);
};

Related

1. send(method)

   Number.prototype.send = function(method) {
     return this[method].call();
   };
   

2. separatorsseparators()

   Number.prototype.separators = function separators(){
     var string = this.toString();
     var x      = string.split('.');
     var x1     = x[0];
     var x2     = x.length > 1 ? '.' + x[1] : '';
     var regex  = /(\d+)(\d{3})/;
     while (regex.test(x1)) {
         x1 = x1.replace(regex, '$1' + ',' + '$2');
     return x1 + x2;
   };
   

3. set(key, value)

   'use strict';
   const assert = require('assert');
   const nan = Symbol('NaN');
   const define = Object.defineProperty;
   Number.prototype[nan] = Object.create(null);
   Number.prototype.set = function (key, value) {
     if (null == this || !isNaN(this)) { return this; }
     const space = this[nan];
     const accessor = {
   ...
   

4. setInCirclesetInCircle(lower, upper)

   Number.prototype.setInCircle = function setInCircle(lower, upper){
     var zahl = this;
     if (lower === upper){
       return lower;
     if (lower > upper){
       var l = lower;
       lower = upper;
       upper = l;
   ...
   

5. setInRangesetInRange(lower, upper)

   Number.prototype.setInRange = function setInRange(lower, upper){
     if (typeof lower === "undefined" || lower === null){
       lower = this;
     if (typeof upper === "undefined" || upper === null){
       upper = this;
     lower = parseFloat(lower) || 0;
     upper = parseFloat(upper) || 0;
   ...
   

6. simEq(number, digits)

   DEFAULT_DIGIT = 5;
   Number.prototype.simEq = function(number, digits) {
     digits = digits == undefined ? DEFAULT_DIGIT : digits;
     var n1 = this.toFixed(digits);
     var n2 = number.toFixed(digits);
     if (n1 == -0)
       n1 = 0;
     if (n2 == -0)
       n2 = 0;
   ...
   

7. sin()

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

8. smallerThan(num)

   Number.prototype.smallerThan = function(num) {
       return this < num;
   

9. snap(resolution)

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