E026: duplicated-condition

Metadata

• Code: E026
• Rule: duplicated-condition
• Status: Stable since v0.0.1
• Quick fix: not available

What it does

Detects duplicated conditions in if / else if chains.

Why is this bad?

Repeating the same condition in one conditional chain usually means a copy-paste bug and can make branches unreachable.

Example

if (a < 1) {
    return 1;
} else if (a > 4) {
    return 2;
} else if (a > 4) {
E026: duplicated condition in conditional chain
    return 3;
}