RS.CLIPPY.NEEDLESS_SPLITN

Usages of `str::splitn` that can be replaced with `str::split`

This checker is a Clippy lint created by The Rust Project Contributors. The documentation shown here is a copy of the original documentation for: needless_splitn. Copyright ©2025 The Rust Team. All rights reserved.

What it does

Checks for usage of str::splitn (or str::rsplitn) where using str::split would be the same.

Why is this bad?

The function split is simpler and there is no performance difference in these cases, considering that both functions return a lazy iterator.

Example

let str = "key=value=add";
let _ = str.splitn(3, \'=\').next().unwrap();

Use instead:

let str = "key=value=add";
let _ = str.split(\'=\').next().unwrap();