在Swift中异步合并两个字典

import Foundation

func mergeDictionaries(dict1: [String: Any], dict2: [String: Any], completion: @escaping ([String: Any]) -> Void) {
    DispatchQueue.global().async {
        var mergedDict = dict1
        for (key, value) in dict2 {
            mergedDict[key] = value
        }
        completion(mergedDict)
    }
}

let dict1 = ["key1": "value1", "key2": "value2"]
let dict2 = ["key3": "value3", "key4": "value4"]

mergeDictionaries(dict1: dict1, dict2: dict2) { mergedDict in
    print(mergedDict)
}