Function Parameter Count

Number of function parameters should be low.

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

  Key	Value
  warning	5
  error	8
  ignores_default_parameters	true

Non Triggering Examples

init(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) {}

init (a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) {}

`init`(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) {}

init?(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) {}

init?<T>(a: T, b: Int, c: Int, d: Int, e: Int, f: Int) {}

init?<T: String>(a: T, b: Int, c: Int, d: Int, e: Int, f: Int) {}

func f2(p1: Int, p2: Int) { }

func f(a: Int, b: Int, c: Int, d: Int, x: Int = 42) {}

func f(a: [Int], b: Int, c: Int, d: Int, f: Int) -> [Int] {
    let s = a.flatMap { $0 as? [String: Int] } ?? []}}

override func f(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) {}

Triggering Examples

↓func f(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) {}

↓func initialValue(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) {}

private ↓func f(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int = 2, g: Int) {}

struct Foo {
    init(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) {}
    ↓func bar(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) {}}