No Magic Numbers

Magic numbers should be replaced by named constants

• Identifier: no_magic_numbers
• Enabled by default: No
• Supports autocorrection: No
• Kind: idiomatic
• Analyzer rule: No
• Minimum Swift compiler version: 5.0.0
• Default configuration:

  Key	Value
  severity	warning
  test_parent_classes	[“QuickSpec”, “XCTestCase”]

Non Triggering Examples

var foo = 123

static let bar: Double = 0.123

let a = b + 1.0

array[0] + array[1] 

let foo = 1_000.000_01

// array[1337]

baz("9999")

func foo() {
    let x: Int = 2
    let y = 3
    let vector = [x, y, -1]
}

class A {
    var foo: Double = 132
    static let bar: Double = 0.98
}

@available(iOS 13, *)
func version() {
    if #available(iOS 13, OSX 10.10, *) {
        return
    }
}

enum Example: Int {
    case positive = 2
    case negative = -2
}

class FooTests: XCTestCase {
    let array: [Int] = []
    let bar = array[42]
}

class FooTests: XCTestCase {
    class Bar {
        let array: [Int] = []
        let bar = array[42]
    }
}

class MyTest: XCTestCase {}
extension MyTest {
    let a = Int(3)
}

extension MyTest {
    let a = Int(3)
}
class MyTest: XCTestCase {}

let foo = 1 << 2

let foo = 1 >> 2

let foo = 2 >> 2

let foo = 2 << 2

let a = b / 100.0

let range = 2 ..< 12

let range = ...12

let range = 12...

let (lowerBound, upperBound) = (400, 599)

let a = (5, 10)

let notFound = (statusCode: 404, description: "Not Found", isError: true)

#Preview {
    ContentView(value: 5)
}

Triggering Examples

foo(↓321)

bar(↓1_000.005_01)

array[↓42]

let box = array[↓12 + ↓14]

let a = b + ↓2.0

let range = 2 ... ↓12 + 1

let range = ↓2*↓6...

let slice = array[↓2...↓4]

for i in ↓3 ..< ↓8 {}

let n: Int = Int(r * ↓255) << ↓16 | Int(g * ↓255) << ↓8

Color.primary.opacity(isAnimate ? ↓0.1 : ↓1.5)

        class MyTest: XCTestCase {}
        extension NSObject {
            let a = Int(↓3)
        }

if (fileSize > ↓1000000) {
    return
}

let imageHeight = (width - ↓24)

return (↓5, ↓10, ↓15)

#ExampleMacro {
    ContentView(value: ↓5)
}