---
layout: default
---

<!-- Note: This file is automatically generated from source code comments. Changes made in this file will be overridden. -->

<h1 id="function-boolean">Function boolean <a href="#function-boolean" title="Permalink">#</a></h1>

Create a boolean or convert a string or number to a boolean.
In case of a number, `true` is returned for non-zero numbers, and `false` in
case of zero.
Strings can be `'true'` or `'false'`, or can contain a number.
When value is a matrix, all elements will be converted to boolean.


<h2 id="syntax">Syntax <a href="#syntax" title="Permalink">#</a></h2>

```js
math.boolean(x)
```

<h3 id="parameters">Parameters <a href="#parameters" title="Permalink">#</a></h3>

Parameter | Type | Description
--------- | ---- | -----------
`value` | string &#124; number &#124; boolean &#124; Array &#124; Matrix &#124; null | A value of any type

<h3 id="returns">Returns <a href="#returns" title="Permalink">#</a></h3>

Type | Description
---- | -----------
boolean &#124; Array &#124; Matrix | The boolean value


<h3 id="throws">Throws <a href="#throws" title="Permalink">#</a></h3>

Type | Description
---- | -----------


<h2 id="examples">Examples <a href="#examples" title="Permalink">#</a></h2>

```js
math.boolean(0)     // returns false
math.boolean(1)     // returns true
math.boolean(-3)     // returns true
math.boolean('true')     // returns true
math.boolean('false')     // returns false
math.boolean([1, 0, 1, 1])     // returns [true, false, true, true]
```


<h2 id="see-also">See also <a href="#see-also" title="Permalink">#</a></h2>

[bignumber](bignumber.html),
[complex](complex.html),
[index](index.html),
[matrix](matrix.html),
[string](string.html),
[unit](unit.html)