mathjs/docs/reference/functions/boolean.md

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# Function boolean

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.


## Syntax

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

### Parameters

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

### Returns

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


## Examples

```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]
```


## See also

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