# aget Get the element at index `$idx` from a mutable array or vector. Zero-based and O(1); literal `[aget ...]` calls compile to a dedicated opcode. Out-of-range indices, negative indices, and non-indexable targets all return nil. ## Syntax

[aget $coll $idx]

## Parameters - `$coll` — Array (from `array`/`array-of`) or vector. - `$idx` — Zero-based index (number). ## Examples

[aget [array 10 20 30] 1]   # → 20
[aget @{10 20 30} 1]        # → 20
[aget [array 10 20 30] 9]   # → nil

## Returns The element at `$idx`, or nil when out of range, negative, non-numeric, or when `$coll` is not an array/vector. Strings and maps are not indexable with `aget` — use `nth` / `get`. ## See Also `aset`, `nth`, `get`, `array`