Deep Nesting (ARCH5184)

Key go.quality.deep-nesting · Severity warning · Category quality

Deeply nested if/for blocks hurt readability and raise cognitive load. Flatten them with early returns (guard clauses).

Incorrect

func handle(u *User) error {
    if u != nil {
        if u.Active {
            if u.Quota > 0 {
                return process(u)
            }
        }
    }
    return errSkip
}

Correct

func handle(u *User) error {
    if u == nil || !u.Active || u.Quota <= 0 {
        return errSkip
    }
    return process(u)
}

Fix

Convert conditions into early returns to flatten the nested blocks.