debounce prior to iOS 16

debounce_compatibility.swift

import Foundation

// < iOS 16

var task: Task<(), Never>?

func debounce(seconds: Double = 1.0,
              operation: @escaping () -> Void) {
    task?.cancel()

    task = Task {
        do {
            try await Task.sleep(seconds: seconds)
            operation()
        } catch {
            // TODO
        }
    }
}

for i in 0...1000 {
    debounce(seconds: 1.0 * 0.00001) {
        print(i)
    }
}

// 0
// 123
// 1000

extension Task where Success == Never, Failure == Never {
    static func sleep(seconds: Double) async throws {
        let duration = UInt64(seconds * 1_000_000_000)
        try await Task.sleep(nanoseconds: duration)
    }
}