# reduceMul

`import { reduceMul } from "destack:math";`

Horizontal reduction: multiply all lanes.

```ds title="reduceMul"
export declare function reduceMul<T, const N: usize>(v: Vector<T, N>): T
```

[language/library/src/math/vector.ds:121](https://github.com/destack-sh/destack/blob/main/language/library/src/math/vector.ds#L121)