# libtmux._internal.sparse_array.SparseArray.add

- **Module:** libtmux._internal.sparse_array
- **Package:** libtmux
- **Language:** Python
- **Kind:** method
- **Source:** https://github.com/tmux-python/libtmux/blob/38e368c11117fb4aeb2f082d552cd4f210eae06a/src/libtmux/_internal/sparse_array.py#L90
- **Page:** https://libtmux.org/en/py/stable/reference/libtmux-_internal-sparse_array-sparsearray-add/

```
libtmux._internal.sparse_array.SparseArray.add(
    self, index: int, value: T
) -> None
```

Add a value at a specific index.

## Examples

```python
>>> from libtmux._internal.sparse_array import SparseArray
```

```python
>>> arr: SparseArray[str] = SparseArray()
>>> arr.add(0, "hook at index 0")
>>> arr.add(10, "hook at index 10")
>>> arr[0]
'hook at index 0'
>>> arr[10]
'hook at index 10'
>>> sorted(arr.keys())
[0, 10]
```

## Type parameters

- [`T`](/en/py/stable/reference/libtmux-_internal-sparse_array-sparsearray/#libtmux._internal.sparse_array.SparseArray.type-parameter.T), declared by [`SparseArray<T>`](/en/py/stable/reference/libtmux-_internal-sparse_array-sparsearray/)

## Parameters

- `index` (`int`): The index at which to store the value.
- `value` (`T`): The value to store.