just-numbers v1.0.3
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 return0
(zero) when no numbers were found in the string. This behavior has changed inv1.0
, and nowundefined
is returned when no numbers are found in the string. If you want to mimic the behavior of0.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