Lightweight & Fast JavaScript Number Formatter

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 75 lines including license info, blank lines and comments. And production release is as small as 849 bytes.

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

• Short, fast, flexible yet standalone. Only 75 lines including MIT license info, blank lines & comments.
• 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

• 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 (+).

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.

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

• Various fixes to get Travis builds to work.

• Forked a copy of the script on GitHub
• Clean up
  • Cleaned up code for jshint.
  • Add grunt build with jshint, testing & compression.
  • Register script with bower.
• Add support for a prefix & suffix within the mask.
  • Updated demo with prefix & suffix examples; showing allowed and not-allowed formats.
  • Updated tests

• Initial development release at https://code.google.com/p/javascript-number-formatter/