parse-decimal-number !Travis  !Downloads

> Parse a decimal number with i18n format support (localized decimal points and thousands separators)

About

OK, let’s fix international numbers parsing and validation once and forever. I got the inspiration for this in a UI project because somehow the libraries we used didn’t do a great job, so I wrote my own parser, and this is a more polished version of it.

These are the design goals:

* Simple. String in, float out, done. ✓
* Accurate. Parses numbers and returns NaN for non-numbers. (=good for input validation) ✓
* Lightweight. (<1k minified) ✓
* Complete. No external dependencies ✓
* Solid. 100% Code Coverage ✓
* CLDR Support. Supports cldr data ✓

In it’s simplest form, you just use it as a parseFloat replacement.

Install

#### Install with npm

``bash
npm i parse-decimal-number --save
`

Usage


`javascript
parseDecimalNumber = require('parse-decimal-number');
console.log(parseDecimalNumber('12,345,678.90'));
// -> 12345678.90

console.log(parseDecimalNumber('12.345.678,90','.,'));
// -> 12345678.90
`

$3


Returns a float representation of _string_ or NaN if _string_ is not a parseable number. Use the optional options parameter to specify the thousands and decimal point characters.

#### Parameters
string A String that is supposed to contain a number.

options _optional_ A string, array or hash with thousands and decimal separators.

* _String_
a two-character string consisting of the thousands character followed by the decimal point character, e.g. ',.'

* _Array_
An array of two elements, the first being the thousands character, the second being the decimal point character, e.g. ['.',',']

* _Hash_ with the following elements (this is compatible with NumeralJS)
* thousands thousands separator character. _Default:_ ,
* decimal decimal point character. _Default:_ .

enforceGroupSize A boolean indicating whether to support that individual groups between the thousands character are exactly 3 digits

#### Examples

`javascript
console.log(parseDecimalNumber('12.345.678,90'));
// -> 12345678.90
`

###### String options
`javascript
console.log(parseDecimalNumber('12.345.678,90','.,'));
// -> 12345678.90
`

###### Array options
`javascript
console.log(parseDecimalNumber('12.345.678,90',['.',',']));
// -> 12345678.90
`

###### Hash options
`javascript
var customSeparators = {thousands:'.',decimal:','};
console.log(parseDecimalNumber('12.345.678,90',customSeparators));
// -> 12345678.90
`

$3


Returns a _function_ that will take a _string_ as an argument and return a float or NaN, just like parseDecimalNumber.

#### Example

`javascript
const cldr = require('cldr');

const locale = 'de_DE';
const options = cldr.extractNumberSymbols(locale);

const parse = parseDecimalNumber.withOptions(options);

parse('123.456.789,0123'); // -> 123456789.0123
`




$3

##### parseDecimalNumber.setOptions
Set the default thousands and decimal characters that are used when no options are passed to parseDecimalNumber.

`javascript
var defaultSeparators = {thousands:'.',decimal:','};
parseDecimalNumber.setOptions(defaultSeparators);

console.log(parseDecimalNumber('12.345.678,90'));
// -> 12345678.90
`


##### parseDecimalNumber.factorySettings
has the same effect as parseDecimalNumber.setOptions({thousands:',',decimal:'.'};)

Using with cldr

You can easily apply CLDR data using the cldr package:

`javascript
const cldr = require('cldr');

parseDecimalNumber(
'12.345.678,90',
cldr.extractNumberSymbols('de_DE')
);
`




Using with Numeral.js


Numeral.js is good at formatting numbers and comes with an extensive set of locale data that you can use with parse-decimal-number.

If you use numeral in your project, you can use their locale data as follows:

`javascript
parseDecimalNumber('12.345.678,90', numeral.localeData('de').delimiters);
// -> 12345678.9
`

You can of course use the same data to set the default values for parse-decimal-number:

`javascript
parseDecimalNumber.setOptions(numeral.localeData('de').delimiters);
parseDecimalNumber('12.345.678,90');
// -> 12345678.9
``

Done :relaxed:

Related Projects

To keep this project as small and modular as possible, the locale data itself has been left out of this library. If you need locale date, other projects might be helpful:

* cldr
* Numeral
* jsi18n
* Unicode Common Locale Data Repository
* Wikipedia

Running tests

{%= include("tests") %}

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality, and please re-build the documentation with gulp-verb before submitting a pull request.

Author

Andreas Pizsa (http://github.com/AndreasPizsa)

+ github/AndreasPizsa
+ twitter/AndreasPizsa

License

Copyright (c) 2017 Andreas Pizsa (http://github.com/AndreasPizsa), contributors.