Performance of Reflection in Swift"

 Published On July 12, 2017

Original question

(Details will be explained later)

Loop 1,000,000 times on my Macbook Pro (in seconds)

  • 2 properties: 1 Int & 1 String
    • Getting mirror: 1.67
    • Looping throw mirror and set values: 5.68
    • Setting values: 0.11
  • 1 property: 1 Int
    • Getting mirror: 1.52
    • Looping throw mirror and set child.value: 3.3
    • Looping throw mirror and set 42: 3.27
    • Setting value 42: 0.05
    • Setting value 42: 0.05

Test Class

	class Test: NSObject {
		var int = 42
		var str = "test"
		var data = [String: Int]()
	}

Benchmark

	var test = Test()
	let date = Date()
	for _ in 0 ... 1000000 {
		let reflection = Mirror(reflecting: test)
		for child in reflection.children {
			if let key = child.label {
				test.setValue(42, forKey: key)
			}
		}
		test.int = 42
		test.str = "test"
		test.data["int"] = 42
	}
	SA.log("BENCHMARK", -date.timeIntervalSinceNow)

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