phpjs/_octopress/source/functions/is_numeric/index.markdown

php.js offers community built php functions in javascript

---
layout: page
title: "JavaScript is_numeric function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/is_numeric:449
- /functions/view/is_numeric
- /functions/view/449
- /functions/is_numeric:449
- /functions/449
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's is_numeric

{% codeblock var/is_numeric.js lang:js https://raw.github.com/kvz/phpjs/master/functions/var/is_numeric.js raw on github %}
function is_numeric (mixed_var) {
  // From: http://phpjs.org/functions
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: David
  // +   improved by: taith
  // +   bugfixed by: Tim de Koning
  // +   bugfixed by: WebDevHobo (http://webdevhobo.blogspot.com/)
  // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: is_numeric(186.31);
  // *     returns 1: true
  // *     example 2: is_numeric('Kevin van Zonneveld');
  // *     returns 2: false
  // *     example 3: is_numeric('+186.31e2');
  // *     returns 3: true
  // *     example 4: is_numeric('');
  // *     returns 4: false
  // *     example 4: is_numeric([]);
  // *     returns 4: false
  return (typeof mixed_var === 'number' || typeof mixed_var === 'string') && mixed_var !== '' && !isNaN(mixed_var);
}
{% endcodeblock %}

 - [Raw function on GitHub](https://github.com/kvz/phpjs/blob/master/functions/var/is_numeric.js)

Please note that php.js uses JavaScript objects as substitutes for PHP arrays, they are 
the closest match to this hashtable-like data structure. 

Please also note that php.js offers community built functions and goes by the 
[McDonald's Theory](https://medium.com/what-i-learned-building/9216e1c9da7d). We'll put online 
functions that are far from perfect, in the hopes to spark better contributions. 
Do you have one? Then please just: 

 - [Edit on GitHub](https://github.com/kvz/phpjs/edit/master/functions/var/is_numeric.js)

### Example 1
This code
{% codeblock lang:js example %}
is_numeric(186.31);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
true
{% endcodeblock %}

### Example 2
This code
{% codeblock lang:js example %}
is_numeric('Kevin van Zonneveld');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
false
{% endcodeblock %}

### Example 3
This code
{% codeblock lang:js example %}
is_numeric('+186.31e2');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
true
{% endcodeblock %}


### Other PHP functions in the var extension
{% render_partial _includes/custom/var.html %}