just-numbers

Remove all non-number characters and return a number. '$1,234' → 1234

Optionally attempt to preserve decimal precision using the float option: '$1,234.12' → 1234.12

Install

$ npm install --save just-numbers

Usage

const justNumbers = require('just-numbers');

justNumbers('$1,234.00');
//=> 123400

justNumbers('$1$2$3$4$5');
//=> 12345

justNumbers('no-numbers-in-string');
//=> undefined

justNumbers('$1,234.23', {float: true});
//=> 1234.23

justNumbers('no-numbers-in-string', {zeroOnEmpty: true});
//=> 0

v1.0

• The 0.0.x version of this module would simply return 0 (zero) when no numbers were found in the string. This behavior has changed in v1.0, and now undefined is returned when no numbers are found in the string. If you want to mimic the behavior of 0.x, you can tell just-numbers to return zero on empty with the zeroOnEmpty option.

• v1.0.0 also allows you to supply your own return value in the event of an empty string using the onNull option.

• Since v1.0.2, if you supply a number to just-numbers, it will simply return that number (because numbers are just numbers). :smiley:

API

just-numbers(input, [options])

Returns a number. If no numbers are found in the string undefined or a custom value is returned.

input

Type: string

The string containing numbers.

options

float

Type: boolean
Default: false

Turns on the attempt to preserve your decimal precision in strings.

justNumbers('$123,456,789.02', {float: true});
//=> 123456789.02

zeroOnEmpty

Type: boolean
Default: false

Returns 0 on empty strings (mimics the 0.x API)

justNumbers('no numbers here', {zeroOnEmpty: true});
//=> 0

onNull

Type: string|object
Default: undefined

Override the return value when no numbers are found in the string.

justNumbers('no numbers here', {onNull: Infinity});
//=> Infinity

justNumbers('no numbers here', {onNull: 'NO NUMBERS!'});
//=> "NO NUMBERS!"

Tip: To avoid quirky behavior when overriding the onNull value, avoid values like {onNull: undefined}, {onNull: null}, or {onNull: 0}. Instead, just use the default behaviors (which returns undefined) or the zeroOnEmpty option.

License

MIT © Michael Wuergler