JavaScript is_float

Returns true if variable is float point

function is_float (mixed_var) {
    // Returns true if variable is float point  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/is_float    // +   original by: Paulo Freitas
    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
    // +   improved by: WebDevHobo (http://webdevhobo.blogspot.com/)
    // +   improved by: Rafał Kukawski (http://blog.kukawski.pl)
    // %        note 1: 1.0 is simplified to 1 before it can be accessed by the function, this makes    // %        note 1: it different from the PHP implementation. We can't fix this unfortunately.
    // *     example 1: is_float(186.31);
    // *     returns 1: true
    return +mixed_var === mixed_var && !!(mixed_var % 1);
}

external links: original PHP docs | raw js source

Examples

Running

1	is_float(186.31);

Should return

true

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

php.js uses JsLint to help us keep our code consistent and prevent some common bugs.

Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.

Authors

Thanks to the following developers, you get to have is_float goodness in JavaScript.

Paulo Freitas ( original )
Brett Zamir ( bugfixed )
WebDevHobo ( improved )
Rafał Kukawski ( improved )

Comments

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Use:

[CODE]
your_stuff('here');
[/CODE]

for proper code formatting
By submitting code here you are allowing us to use it in php.js hence dual licensing it under the MIT and GPL licenses

CoursesWeb
Apr 30th

Hi,
For is_float i use this version:

function is_float(n) {
  return n===+n && n!==(n|0);
}

- is_float() doesn't always work if you are validating form input. This is because form inputs are strings, even if the user typed a number.

Enrique Melendez
23 Mar '11

version in one line:

return typeof mixed_var == 'number' ? !!(mixed_var % 1) : false;

WebDevHobo
13 Dec '09

Nevermind my comments, I just now noticed in the docs the text about the 1.0 issue. :P

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