Question

我找到了此帖子中的代码段：https://stackoverflow.com/a/24052094/2754218并在Playground中对其进行了测试。

func +=<K, V> (inout left: [K: V], right: [K: V]){ 
  for (k, v) in right { 
    left[k] = v
  }
}

var test = ["1": "a"] += ["2": "b"]

代码会导致：Binary operator '+=' cannot be applied to two [String : String] operands.

有什么建议吗？

解决方案：

感谢Eric，我与运营商一起创建了一个功能＆＃34; +＆＃34;：

func +<K, V> (left: [K: V], right: [K: V]) -> [K: V] {
  var newDic = left

  for (k, v) in right {
    newDic[k] = v
  }

  return newDic
}

var toto = ["1": "a"] + ["2": "b"]

Answer 1

此函数不返回任何内容，它将第一个值作为inout传递，这意味着它将改变左手对象本身：

var test = ["1": "a"]

test += ["2": "b"]

print(test)  // ["2": "b", "1": "a"]

无法连接两个词典

1 个答案: