parse-decimal-number
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 ✓
In it’s simplest form, you just use it as a parseFloat
replacement.
Install
Install with npm
npm i parse-decimal-number --save
Usage
parseDecimalNumber = require('parse-decimal-number');
console.log(parseDecimalNumber('12,345,678.90'));
console.log(parseDecimalNumber('12.345.678,90','.,'));
parseDecimalNumber(string [,options])
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: .
Examples
console.log(parseDecimalNumber('12.345.678,90'));
String options
console.log(parseDecimalNumber('12.345.678,90','.,'));
Array options
console.log(parseDecimalNumber('12.345.678,90',['.',',']));
Hash options
var customSeparators = {thousands:'.',decimal:','};
console.log(parseDecimalNumber('12.345.678,90',customSeparators));
Setting and Resetting Default Options
parseDecimalNumber.setOptions
Set the default thousands and decimal characters that are used when no options are passed to parseDecimalNumber
.
var defaultSeparators = {thousands:'.',decimal:','};
parseDecimalNumber.setOptions(defaultSeparators);
console.log(parseDecimalNumber('12.345.678,90'));
parseDecimalNumber.factorySettings
has the same effect as parseDecimalNumber.setOptions({thousands:',',decimal:'.'};)
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:
parseDecimalNumber('12.345.678,90', numeral.countryData('de').delimiters);
You can of course use the same data to set the default values for parse-decimal-number
:
parseDecimalNumber.setOptions(numeral.countryData('de').delimiters);
parseDecimalNumber('12.345.678,90');
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:
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)
License
Copyright (c) 2016 Andreas Pizsa (http://github.com/AndreasPizsa), contributors.
This file was generated by gulp-verb on February 10, 2016.