# Array.each

## Function

Iterate through the array and execute callbacks.

## Syntax

```bt
array.each(callback)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| callback | Fn | No | Empty | The callback signature is fn(value, index, current). |

## Return value

| Type | Description |
| ------ | ------ |
| Array | Returns the original array to facilitate continued chain calls. |

## Example

```bt
items = [1, 2, 3]
sum = 0
items.each(fn(value) { sum += value })

// Output: 6
echo(sum)
```

## Notes

- The traversal source is a shallow copy of the array at the time of the call.
- When the callback is not a function, no error is raised and its result is treated as Null.