@fav/type.to-number

Converts a number or a string to a number.

"fav" is an abbreviation of "favorite" and also the acronym of "for all versions". This package is intended to support all Node.js versions and many browsers as possible. At least, this package supports Node.js >= v0.10 and major Web browsers: Chrome, Firefox, IE11, Edge, Vivaldi and Safari.

Install

To install from npm:

$ npm install --save @fav/type.to-number

NOTE: npm < 2.7.0 does not support scoped package, but old version Node.js supports it. So when you use such older npm, you should download this package from github.com, and move it in node_modules/@fav/type.to-number/ directory manually.

Usage

For Node.js:

var toNumber = require('@fav/type.to-number');
toNumber(123); // => 123
toNumber('45.6'); // => 45.6
toNumber(Infinity); // => Infinity
toNumber('ABC'); // =>> NaN
toNumber('ABC', 100); // => 100

For Web browsers:

<script src="fav.type.to-number.min.js"></script>
<script>
var toNumber = fav.type.toNumber;
toNumber(123); // => 123
</script>

API

toNumber(value [, defaultValue]): number

Converts a number or a string to a number. If value is neither a number nor a numeric string, this function returns NaN, or defaultValue if specified.

NOTE: Number('') and Number(' ') return 0. parseInt(' 123'), parseInt('123abc'), parseFloat(' 123') and parseFloat('123abc') return 123. However, this function returns NaN in all such cases.

Parameter:

Parameter	Type	Description
value	any	The number or string to be converted.
defaultValue	any	Is returned when failing to convert. (Optional)

Returns:

The converted number, or NaN (or defaultValue if specified) when failing to convert.

Type: number

Checked

Node.js (4〜)

Platform	4	5	6	7	8	9	10
macOS	◯	◯	◯	◯	◯	◯	◯
Windows10	◯	◯	◯	◯	◯	◯	◯
Linux	◯	◯	◯	◯	◯	◯	◯

io.js (1〜3)

Platform	1	2	3
macOS	◯	◯	◯
Windows10	◯	◯	◯
Linux	◯	◯	◯

Node.js (〜0.12)

Platform	0.8	0.9	0.10	0.11	0.12
macOS	◯	◯	◯	◯	◯
Windows10	◯	◯	◯	◯	◯
Linux	◯	◯	◯	◯	◯

Web browsers

Platform	Chrome	Firefox	Vivaldi	Safari	Edge	IE11
macOS	◯	◯	◯	◯	--	--
Windows10	◯	◯	◯	--	◯	◯
Linux	◯	◯	◯	--	--	--

License

Copyright (C) 2018 Takayuki Sato

This program is free software under MIT License. See the file LICENSE in this distribution for more details.