RS.CLIPPY.IF_NOT_ELSE

`if` branches that could be swapped so no negation operation is necessary on the condition

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

What it does

Checks for usage of ! or != in an if condition with an else branch.

Why is this bad?

Negations reduce the readability of statements.

Example

if !v.is_empty() {
    a()
} else {
    b()
}

Could be written:

if v.is_empty() {
    b()
} else {
    a()
}