Javascript Number Formatter

Lightweight & Fast JavaScript Number Formatter

Introduction

This standalone number formatter is intended to be short and fast. As they are the main factors for a high performance JavaScript app. Development release is as short as < 120 lines including license info, blank lines and comments. And production release is less than 1,200 bytes.

format( "#,##0.####", 1234567.890 );  // output: "1,234,567.89"
format( "$ #,###.00", -1234567.890 ); // output: "$ -1,234,567.89"

Features

• Short, fast, flexible yet standalone.
• Accept standard number formatting like #,##0.00 or with negation -000.####.
• Accept any country format like # ##0,00, #,###.##, #'###.## or any type of non-numbering symbol.
• Accept any numbers of digit grouping. #,##,#0.000 or #,###0.## are all valid.
• Accept any redundant/fool-proof formatting. ##,###,##.# or 0#,#00#.###0# are all OK.
• Auto number rounding.
• Simple interface, just supply mask & value like this: format( "0.0000", 3.141592).
• Include a prefix & suffix with the mask

Limitations

• No scientific/engineering formatting.
• Not for date or phone formation.
• No color control.
• No prefix or suffix is allowed except leading negation symbol. So $#,##0.00 or #,###.##USD will not yield expected outcome. Use '$'+format('#,##0.00', 123.45) or format('#,##0.00', 456.789) + 'USD'
• The prefix or suffix can not include any numbers (0-9), dashes (-), or plus signs (+).

Installation

npm package

npm install --save number-format.js

bower

bower install number-format.js --save

Note

When there's only one symbol is supplied, system will always treat the single symbol as Decimal. For instance, format( '#,###', 1234567.890) will output 1234567,890. To force a single symbol as Separator, add a trailing dot to the end like this: format( '#,###.', 1234567.890) which will then output 1,234,567.

A demo/sample page with few examples is provided (DEMO). The code is safe to be minimized using Google Compiler in Advanced mode.

Version

V1.1.5 (1/26/2015)

• Change name in bower.json & package.json to "number-format.js".
• Update readme with installation instructions.

v1.1.4 (1/26/2015)

• Add AMD & NodeJS compatibility (UMD). Thanks MadMG!
• Renamed variables & code cleanup to make it more readable.

v1.1.3 (11/12/2014)

• Fix bower link to point to the production version. Thanks marcelboettcher!
• Minor code & demo cleanup.

v1.1.2 (6/22/2014)

• Remove negative sign from results with a value of zero.
• Added more examples to demo page.