> Aztec.nr API reference, v6.0.0 (mainnet and testnet). Index: https://docs.aztec.network/aztec-nr-api/v6.0.0/llms.txt

# Function find_first_index

Module: `noir_aztec::protocol::utils::arrays`

```rust
pub unconstrained fn find_first_index<T, let N: u32, Env>(
    array: [T; N],
    find: fn[Env](T) -> bool,
) -> u32
```

Helper function to find the index of the first element in an array that satisfies a given predicate. If the element is not found, the function returns the length of the array `N`