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我想創建一個整數類型的鍵地圖的地圖,但是這並不工作:創建一個帶有整數鍵
iex(1)> a = %{3: "fdsfd"}
** (SyntaxError) iex:1: unexpected token: ":" (column 8, codepoint U+003A)
iex(1)> a = %{:3 => "fdsfd"}
** (SyntaxError) iex:1: unexpected token: ":" (column 7, codepoint U+003A)