Cyclomatic Complexity

Complexity of function bodies should be limited.

• Identifier: cyclomatic_complexity
• Enabled by default: Yes
• Supports autocorrection: No
• Kind: metrics
• Analyzer rule: No
• Minimum Swift compiler version: 5.0.0
• Default configuration:

  Key	Value
  warning	10
  error	20
  ignores_case_statements	false

Non Triggering Examples

func f1() {
    if true {
        for _ in 1..5 { }
    }
    if false { }
}

func f(code: Int) -> Int {
    switch code {
    case 0: fallthrough
    case 1: return 1
    case 2: return 1
    case 3: return 1
    case 4: return 1
    case 5: return 1
    case 6: return 1
    case 7: return 1
    case 8: return 1
    default: return 1
    }
}

func f1() {
    if true {}; if true {}; if true {}; if true {}; if true {}; if true {}
    func f2() {
        if true {}; if true {}; if true {}; if true {}; if true {}
    }
}

Triggering Examples

↓func f1() {
    if true {
        if true {
            if false {}
        }
    }
    if false {}
    let i = 0
    switch i {
        case 1: break
        case 2: break
        case 3: break
        case 4: break
        default: break
    }
    for _ in 1...5 {
        guard true else {
            return
        }
    }
}