phpjs/functions/var/is_float.js

php.js offers community built php functions in javascript

function is_float(mixed_var) {
  //  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: 1.0 is simplified to 1 before it can be accessed by the function, this makes
  //        note: 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 && (!isFinite(mixed_var) || !! (mixed_var % 1));
}