php从map删除指定的元素并返回一个新的map
val origMap = Map("key1" -> "something", "key2" -> "else");
val myMap = origMap - "key1";
//myMap looks like Map("key2" -> "else")
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php从map删除指定的元素并返回一个新的map
val origMap = Map("key1" -> "something", "key2" -> "else");
val myMap = origMap - "key1";
//myMap looks like Map("key2" -> "else")
