greenchiu

import Foundation

enum PromiseError: Error {
    case invaild
}
public struct AsyncExecutor {
    public static let main = AsyncExecutor()
    public static let background = AsyncExecutor(qos: .default)
    
    private let queue: DispatchQueue

greenchiu

protocol X {
    func hello()
}

extension X {
    func hello() {
        print("Hello")
    }
}

greenchiu

class UnivalCountSolution {
    private var count = 0
    private var testCount = 0
    func soultion(_ root: TreeNode?) -> Int {
        guard let root = root else {
            return 0
        }
        isUnivalSubtree(root)
        return count
    }

greenchiu

func Solution(_ nums1:[Int], _ nums2: [Int]) -> Int? {
    let set: Set<Int> = Set(nums1)
    var result: Int?
    for element in nums2 {
        if set.contains(element) {
            if let currentMin = result {
                result = min(element, currentMin)
                continue
            }
            result = element

greenchiu

- (viod)loadSongInfo:(LocalSongInfo *)inSongInfo 
{
	// load image 
	if (inSongInfo.source == ... ) {
		self.coverImage.image = [[MediaItem itemWithSongID:...].artwork imageWith...];
	}
	else if (inSongInfo.source == ... ) {
		SongMetadata *metadata = ...
		[metadata getImagWithCallback:...]
	}