mathjs/docs/reference/functions/setSize.md

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

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# Function setSize

Count the number of elements of a (multi)set. When a second parameter is 'true', count only the unique values.
A multi-dimension array will be converted to a single-dimension array before the operation.


## Syntax

```js
math.setSize(set)
math.setSize(set, unique)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`a` | Array &#124; Matrix | A multiset

### Returns

Type | Description
---- | -----------
number | The number of elements of the (multi)set


## Examples

```js
math.setSize([1, 2, 2, 4])          // returns 4
math.setSize([1, 2, 2, 4], true)    // returns 3
```


## See also

[setUnion](setUnion.md),
[setIntersect](setIntersect.md),
[setDifference](setDifference.md)