js配列分類

元のデータタイプ:let test=[
 
｛id:「7」、city:「全部」、name:「おかゆ」｝
｛id:“6”、city:“全部”、name:“ご飯”｝
｛id:「1」、city:「重慶」、name:「鍋」｝
｛id:「2」、city:「江蘇」、name:「肥大粉」｝
｛id:「3」、city:「重慶」、name:「小面」｝
｛id:「4」、city:「北京」、name:「北京ダック」｝
｛id:「5」、city:「北京」、name:「酸味辛味粉」｝
」
変換を期待:
var corect=[{    city:“全部”,info:{id:'6',name:''ご飯',{id:'7',name:''お粥'',},{city::"重慶",info:{id:'1',name:''鍋',{id:',name:',name:',name:'',name:''',name:''',name:'',name:''',name:'''',北京北京北京北京京''''',ddy'''',5'''''''''''',name','',name',''','''''',''''',name,''''',ティ:「江蘇」,info:{{id:''2',name:'肥大肠粉'}
」
方法:

let list = test,
    data = []; 
    
for(var i = 0,length = test.length; i < length; i++) {
    if(!data[list[i].city]) {
        var arr = [];
        arr.push(list[i]);
        data[list[i].city] = arr;
    }else {
        data[list[i].city].push(list[i])
    }
}