# notContains

`import { notContains } from "destack:assert";`

Assert that `values` does not contain `expected`.

```ds title="notContains"
export function notContains<T>(values: readonly Iterable<T>, expected: T, message?: string | undefined): void
```

[language/library/src/assert/assert.ds:84:87](https://github.com/destack-sh/destack/blob/main/language/library/src/assert/assert.ds#L84-L87)