> For the complete documentation index, see [llms.txt](https://osl.mistium.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://osl.mistium.com/methods/arrays/aggregating.md).

# Aggregating

Reduce an array to a single value. Numeric aggregates ignore non-numeric elements.

#### `.sum()` → `number`

Adds the numeric elements.

```javascript
log [1, 2, 3, 4, 5].sum()       // 15
log [1, "two", 3, null].sum()   // 4
```

#### `.product()` → `number`

Multiplies the numeric elements.

```javascript
log [1, 2, 3, 4].product()  // 24
```

#### `.average()` → `number`

The mean of the elements.

```javascript
log [1, 2, 3].average()  // 2
```

#### `.max()` → `number` / `.min()` → `number`

The largest / smallest element.

```javascript
arr = [3, 1, 4, 1, 5, 9, 2, 6]
log arr.max()  // 9
log arr.min()  // 1
```

#### `.join(sep)` → `string`

Joins the elements into a string separated by `sep`.

```javascript
log [1, 2, 3].join("-")  // "1-2-3"
```