一維數組元素分類轉換成二維數組

數組元素按照某個key分類轉換成二維數組web let test =[ {id:0,code:"4"}, {id:1,code:"1"}, {id:2,code:"1"}, {id:3,code:"2"}, {id:4,code:"2"}, {id:5,code:"3"}, {id:6,

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