Nodejs Number Convert toPrecisionFixed(precision)

Method Source Code

Number.prototype.toPrecisionFixed = function(precision) {
   // www.  j a  v a 2s .c o  m
   // use standard toPrecision method
   var n = this.toPrecision(precision);
   
   // ... but replace +ve exponential format with trailing zeros
   n = n.replace(/(.+)e\+(.+)/, function(n, sig, exp) {
     sig = sig.replace(/\./, '');       // remove decimal from significand
     l = sig.length - 1;
     while (exp-- > l) sig = sig + '0'; // append zeros from exponent
     return sig;
   });
   
   // ... and replace -ve exponential format with leading zeros
   n = n.replace(/(.+)e-(.+)/, function(n, sig, exp) {
     sig = sig.replace(/\./, '');       // remove decimal from significand
     while (exp-- > 1) sig = '0' + sig; // prepend zeros from exponent
     return '0.' + sig;
   });
   
   return n;
}

// Merge Objects

Object.merge = function(o1, o2) {
   for(var i in o2) { o1[i] = o2[i]; }
   return o1;
}

Related

1. toCounter()

   Number.prototype.toCounter = function () {
       var d = this;
       d = Number(d);
       var h = Math.floor(d / 1000 / 3600 );
       var m = Math.floor(d / 1000 % 3600 / 60);
       var s = Math.floor(d / 1000 % 3600 % 60);
       var ms = (d % 3600000 % 60000 % 1000);
       var tenths = Math.floor(ms / 100);
       return ((h > 0 ? h + ":" + (m < 10 ? "0" : "") : "") + m + ":" + (s < 10 ? "0" : "") + s + "." + tenths);
   ...
   

2. toDigits()

   Number.prototype.toDigits = Number.prototype.toDigits || function () {
     let number = this;
     let digits = [];
     while (number > 0) {
       digits[digits.length] = number % 10;
       number = Math.floor(number / 10);
     return digits.reverse();
   };
   ...
   

3. toDollars(c, printSign)

   Number.prototype.toDollars = function(c, printSign){
     var n = this,
       c = isNaN(c = Math.abs(c)) ? 2 : c,
       d = ".",
       t = ",",
       s = n < 0 ? "-" : "",
       i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "",
       j = (j = i.length) > 3 ? j % 3 : 0,
       sign = printSign ? '$': '';
   ...
   

4. toMinutes()

   Number.prototype.toMinutes = function(){
     return (Math.floor(parseInt(this)/60)).addTrailingZero()+":"+(parseInt(this)%60).addTrailingZero();
   };
   

5. toNumber( val )

   var NumberUtils = new function() {
       this.toNumber = function( val ) {
           if(val==null || val=="") return null;
       val = val.replace(',', '');
           return eval(val);
       this.toInteger = function( val ) {
       val = val.replace(',', '');
           return parseInt(val, 10); 
   ...
   

6. toPrecision(length)

   Number.prototype.toPrecision = function toPrecision(length) {
       return parseFloat(this.toFixed(length));
   };
   

7. toS()

   function numberToPx(number) {
     return number + "px"; 
   function getMilliseconds(timestampStr) {
     var timestampStrSplit = timestampStr.split(".");
     var milli = Date.parse("January 1, 1970 " + timestampStrSplit[0] + " UTC");
     if (timestampStrSplit.length == 1)
       return milli;
     else (timestampStrSplit.length == 2)
   ...
   

8. to_feet()

   Number.prototype.to_feet = function() {
     return this / 0.3048;
   };