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https://github.com/Mottie/javascript-number-formatter

Lightweight & Fast JavaScript Number Formatter
https://github.com/Mottie/javascript-number-formatter

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Lightweight & Fast JavaScript Number Formatter

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README 

        
# Javascript Number Formatter



Lightweight & Fast JavaScript Number Formatter



[![Build Status][build-image]][build-url] [![NPM Version][npm-image]][npm-url] [![devDependency Status][david-dev-image]][david-dev-url] [![MIT][license-image]][license-url]



## 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 around 150 lines including license info, blank lines and comments. And production release is less than 2,000 bytes.



```js

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

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



// Added in v2.0.0

format( "$ #,###.00", -1234567.890, {enforceMaskSign: true});  // output: "$ 1,234,567.89"

format( "$ -#,###.00", -1234567.890, {enforceMaskSign: true}); // output: "$ -1,234,567.89"

format( "$ +#,###.00", -1234567.890, {enforceMaskSign: true}); // output: "$ -1,234,567.89"

format( "$ +#,###.00", 1234567.890, {enforceMaskSign: true});  // output: "$ +1,234,567.89"

```



† Initial development release of this code was written by KPL and hosted at [Google Code](https://code.google.com/p/javascript-number-formatter/).



## 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 (`+`).



## Format Symbols



| Description   | Symbol | Summary |

|---------------|--------|---------|

| Mask symbols  | #0123456789+- | Mask symbols used for formatting the value. |

| Placeholders  | #123456789    | Un-forced digit*; this optional digit will only show if it is required as a placeholder. |

| Zero          | 0             | Forced digit; the digit will be shown whether or not the digit is relevant to the value. |

| Signs         | +-            | Indicates a positive or negative value; visible depending on the value sign and the `enforceMaskSign` setting. |

| Leftmost      |               | _Any_ non-mask symbol† inside the mask will be set to represent a thousands separator. |

| Rightmost     |               | _Any_ non-mask symbol† inside the mask‡ will be set to represent the decimal separator. |

| Prefix/Suffix |               | _Any_ non-mask symbol† outside the mask. |



\* Non-zero mask digits (`1` through `9`) behave the same as the `#`.


† Anything not a digit, and not a `+`, `-` or `#`.


‡ In the case where there is a trailing decimal or comma, it will be included in the mask, e.g. `#.` or `0,`.



## Note



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`.



## Installation



### npm package



    npm install --save number-format.js



## Demos



A demo/sample page with few examples is provided ([demo](http://mottie.github.io/javascript-number-formatter/)).



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



[build-url]: https://travis-ci.org/Mottie/javascript-number-formatter

[build-image]: https://travis-ci.org/Mottie/javascript-number-formatter.png?branch=master

[npm-url]: https://www.npmjs.com/package/number-format.js

[npm-image]: https://img.shields.io/npm/v/number-format.js.svg

[david-dev-url]: https://david-dm.org/Mottie/javascript-number-formatter?type=dev

[david-dev-image]: https://david-dm.org/Mottie/javascript-number-formatter/dev-status.svg

[license-url]: https://github.com/Mottie/javascript-number-formatter/blob/master/LICENSE

[license-image]: https://img.shields.io/badge/license-MIT-blue.svg



## Recent Changes



View the [complete change log here](https://github.com/Mottie/javascript-number-formatter/wiki).



### v2.0.7 (2018-11-13)



* Update typescript binding. See [issue #20](https://github.com/Mottie/javascript-number-formatter/issues/20).

* Fix improper placeholder behavior. Updated Readme with format symbols table. Closes [issue #19](https://github.com/Mottie/javascript-number-formatter/issues/19).

* Add more tests.

* Meta:

  * Update dependencies.

  * Improve code readability.

  * Include version in min.js.



### v2.0.6 (2018-11-06)



* Trim trailing zeros in mask. Fixes [issue #18](https://github.com/Mottie/javascript-number-formatter/issues/18).



### v2.0.0 – 2.0.5 (2018-10-26)



* Add `ignoreSign` option (modified to `enforeceMaskSign`!).

* Switch to XO, AVA & rollup.

* Meta: Update dot files & remove bower support.

* Code cleanup & convert to ES2015.

  * Rename `ignoreSign` to `enforceMaskSign` (default `false`).

  * Reduce code complexity.

  * Export as node module.

  * Update TS with options.

  * Switch demo to use lib file & highlight valid results.

* Switch from Grunt to rollup.

* Switch from IIFE to UMD output.