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# sum

> ⚠️ **This is not a builtin function.**

`sum()` is an **array method**, not a standalone function. See [Array aggregating methods](/methods/arrays/aggregating.md).

## Usage

```javascript
[10, 10, 5, 3, 5].sum()
// 33

[2, 5].sum()
// 7
```

Call `.sum()` on an array to find the total value of all the numbers in that array.