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 < 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"

† Initial development release of this code was written by KPL and hosted at Google Code.

• 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.
• The code is safe to be minimized using Google Compiler in Advanced mode.

• 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 (+).

npm install --save hyyan/javascript-number-formatter

bower install hyyan/javascript-number-formatter --save

When only one symbol is supplied, the library will always treat that symbol as a decimal. For example, format( '#,###', 1234567.890) will output 1234567,890.

To force a single symbol to be used as a separator, add a trailing symbol. In this example, a period is added to the end of the mask - format( '#,###.', 1234567.890) - resulting in it being used as a decimal and forcing the first symbol to be the separator and return this output: 1,234,567.

A demo/sample page with few examples is provided (demo).

And a jsFiddle was created to aid in testing: https://jsfiddle.net/Mottie/t2etyodx/

• Fix the lib throws an error on null and undefined values

• Implement different Handling for Negative "-" and Positive "+" Signs

• Readme:
  • Update log.
  • Add playground link.
  • Reword note.
• Meta:
  • Update dependencies.
  • Remove GPL portion of the license & update package.json entry.
  • Fix bower.json "main" reference.
• Build:
  • Fix build process to use the updated package.json license format.

• Update license.
• Update dependencies & rebuild.

• Update dependencies & version bump.