Hi, here is the playground snippet: var noOptDict = ["one": 1, "two": 2, "three": 3 ] noOptDict["one"] = nil noOptDict // “one” is gone
var optDict: [String: Int?] = ["one": 1, "two": 2, "three": nil] optDict["one"] = nil optDict // “one” is gone but “three” is still there So the first dict instance works as it should, the second using opt values allows to store nil but deletes the key when you assign nil. Is it bug, feature, or both? Best wishes, Artyom _______________________________________________ swift-users mailing list swift-users@swift.org https://lists.swift.org/mailman/listinfo/swift-users