---
layout: page
title: "JavaScript str_rot13 function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/str_rot13:528
- /functions/view/str_rot13
- /functions/view/528
- /functions/str_rot13:528
- /functions/528
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's str_rot13

{% codeblock strings/str_rot13.js lang:js https://raw.github.com/kvz/phpjs/master/functions/strings/str_rot13.js raw on github %}
function str_rot13 (str) {
  // From: http://phpjs.org/functions
  // +   original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
  // +   improved by: Ates Goral (http://magnetiq.com)
  // +   bugfixed by: Onno Marsman
  // +   improved by: Rafał Kukawski (http://blog.kukawski.pl)
  // *     example 1: str_rot13('Kevin van Zonneveld');
  // *     returns 1: 'Xriva ina Mbaariryq'
  // *     example 2: str_rot13('Xriva ina Mbaariryq');
  // *     returns 2: 'Kevin van Zonneveld'
  // *     example 3: str_rot13(33);
  // *     returns 3: '33'

  return (str + '').replace(/[a-z]/gi, function (s) {
    return String.fromCharCode(s.charCodeAt(0) + (s.toLowerCase() < 'n' ? 13 : -13));
  });
}
{% endcodeblock %}

 - [Raw function on GitHub](https://github.com/kvz/phpjs/blob/master/functions/strings/str_rot13.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/strings/str_rot13.js)

### Example 1
This code
{% codeblock lang:js example %}
str_rot13('Kevin van Zonneveld');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
'Xriva ina Mbaariryq'
{% endcodeblock %}

### Example 2
This code
{% codeblock lang:js example %}
str_rot13('Xriva ina Mbaariryq');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
'Kevin van Zonneveld'
{% endcodeblock %}

### Example 3
This code
{% codeblock lang:js example %}
str_rot13(33);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
'33'
{% endcodeblock %}


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