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

php.js offers community built php functions in javascript

---
layout: page
title: "JavaScript tanh function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/tanh:561
- /functions/view/tanh
- /functions/view/561
- /functions/tanh:561
- /functions/561
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's tanh

{% codeblock math/tanh.js lang:js https://raw.github.com/kvz/phpjs/master/functions/math/tanh.js raw on github %}
function tanh (arg) {
  // From: http://phpjs.org/functions
  // +   original by: Onno Marsman
  // *     example 1: tanh(5.4251848798444815);
  // *     returns 1: 0.9999612058841574
  return (Math.exp(arg) - Math.exp(-arg)) / (Math.exp(arg) + Math.exp(-arg));
}
{% endcodeblock %}

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

### Example 1
This code
{% codeblock lang:js example %}
tanh(5.4251848798444815);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
0.9999612058841574
{% endcodeblock %}


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