Precision option

README.md

@@ -35,9 +35,15 @@ _*(string)*_ Output of function (`array`, `exponent`, `object`, or `string`), de
 ### pad
 _*(boolean)*_ Decimal place end padding, default is `false`
 
+### precision
+_*(number)*_ Sets precision of numerical output, default is `0`
+
 ### round
 _*(number)*_ Decimal place, default is `2`
 
+### roundingMethod
+_*(string)*_ Rounding method, can be `round`, `floor`, or `ceil`, default is `round`
+
 ### separator
 _*(string)*_ Decimal separator character, default is `.`
 
@@ -53,9 +59,6 @@ _*(object)*_ Dictionary of SI/JEDEC/IEC symbols to replace for localization, def
 ### unix
 _*(boolean)*_ Enables unix style human readable output, e.g `ls -lh`, default is `false`
 
-### roundingMethod
-_*(string)*_ Rounding method, can be `round`, `floor`, or `ceil`, default is `round`
-
 ## Examples
 
 ```javascript

lib/filesize.es6.js

@@ -42,7 +42,7 @@
 	function filesize (arg, descriptor = {}) {
 		let result = [],
 			val = 0,
-			e, base, bits, ceil, full, fullforms, locale, localeOptions, neg, num, output, pad, round, u, unix, separator, spacer, standard, symbols, roundingFunc;
+			e, base, bits, ceil, full, fullforms, locale, localeOptions, neg, num, output, pad, round, u, unix, separator, spacer, standard, symbols, roundingFunc, precision;
 
 		if (isNaN(arg)) {
 			throw new TypeError("Invalid number");
@@ -67,6 +67,7 @@
 		num = Number(arg);
 		neg = num < 0;
 		ceil = base > 2 ? 1000 : 1024;
+		precision = isNaN(descriptor.precision) === false ? parseInt(descriptor.precision, 10) : 0;
 
 		// Flipping a negative number to determine the size
 		if (neg) {
@@ -84,6 +85,10 @@
 
 		// Exceeding supported length, time to reduce & multiply
 		if (e > 8) {
+			if (precision > 0) {
+				precision += 8 - e;
+			}
+
 			e = 8;
 		}
 
@@ -132,6 +137,11 @@
 			result[0] = -result[0];
 		}
 
+		// Setting optional precision
+		if (precision > 0) {
+			result[0] = result[0].toPrecision(precision);
+		}
+
 		// Applying custom symbol
 		result[1] = symbols[result[1]] || result[1];
 

lib/filesize.js

@@ -62,7 +62,8 @@
 	      spacer,
 	      standard,
 	      symbols,
-	      roundingFunc;
+	      roundingFunc,
+	      precision;
 
 	  if (isNaN(arg)) {
 	    throw new TypeError("Invalid number");
@@ -86,7 +87,8 @@
 	  roundingFunc = roundingFuncs[descriptor.roundingMethod] || Math.round;
 	  num = Number(arg);
 	  neg = num < 0;
-	  ceil = base > 2 ? 1000 : 1024; // Flipping a negative number to determine the size
+	  ceil = base > 2 ? 1000 : 1024;
+	  precision = isNaN(descriptor.precision) === false ? parseInt(descriptor.precision, 10) : 0; // Flipping a negative number to determine the size
 
 	  if (neg) {
 	    num = -num;
@@ -103,6 +105,10 @@
 
 
 	  if (e > 8) {
+	    if (precision > 0) {
+	      precision += 8 - e;
+	    }
+
 	    e = 8;
 	  }
 
@@ -149,6 +155,11 @@
 
 	  if (neg) {
 	    result[0] = -result[0];
+	  } // Setting optional precision
+
+
+	  if (precision > 0) {
+	    result[0] = result[0].toPrecision(precision);
 	  } // Applying custom symbol