javascript - 遍历此JavaScript的最佳方法是什么

我有一个项目的主列表，这是一个嵌套的对象数组，我也有一个选定的列表。

let masterList = [{
  category_id: 1,
  meta_list: [{
    name: "Cuisine",
    id: "QWEQWEQWE",
    is_multiselect: false,
    item_list: ["Arabian", "Indian"]
  }, {
    name: "Cost for Two",
    id: "SFDFSDASDASDASD",
    is_multiselect: true,
    item_list: [
      "AED 0 - 100",
      "AED 100 - 200",
      "Greater Than AED 200"
    ]
  }]
}, {
  category_id: 2,
  meta_list: [{
    name: "Cat 2",
    id: "cat2",
    is_multiselect: false,
    item_list: ["cat 2 1", "cat 2 2"]
  }, {
    name: "cuisine 2",
    id: "cui2",
    is_multiselect: true,
    item_list: ["cu1", "cu2"]
  }]
}];

let selectedList = [{
  category_id: 1,
  meta_list: [{
    name: "Cuisine",
    id: "QWEQWEQWE",
    is_multiselect: false,
    item_list: ["Arabian"]
  }, {
    name: "Cost for Two",
    id: "SFDFSDASDASDASD",
    is_multiselect: true,
    item_list: [
      "AED 100 - 200",
      "Greater Than AED 200"
    ]
  }]
}, {
  category_id: 2,
  meta_list: [{
    name: "cuisine 2",
    id: "cui2",
    is_multiselect: true,
    item_list: ["cu1"]
  }]
}];

使用masterList和选择的列表，我想有一个namedList
必须看起来像这样

[{
  category_id: 1,
  meta_list: [{
    name: "Cuisine",
    id: "QWEQWEQWE",
    is_multiselect: false,
    item_list: ["Arabian", "Indian"],
    sel_list: ["Arabian"]
  }, {
    name: "Cost for Two",
    id: "SFDFSDASDASDASD",
    is_multiselect: true,
    item_list: [
      "AED 0 - 100",
      "AED 100 - 200",
      "Greater Than AED 200"
    ],
    sel_list: [
      "AED 100 - 200",
      "Greater Than AED 200"
    ]
  }]
}, {
  category_id: 2,
  meta_list: [{
    name: "Cat 2",
    id: "cat2",
    is_multiselect: false,
    item_list: ["cat 2 1", "cat 2 2"],
    sel_list: ["cat 2 2"]
  }, {
    name: "cuisine 2",
    id: "cui2",
    is_multiselect: true,
    item_list: ["cu1", "cu2"],
    sel_list: ["cu1"]
  }]
}];

我希望具有与masterList相同的项和结构的期望列表，除了它具有另一个属性sel_list，其值将是item_list数组中selected_list的对应值。
masterList和selectedList的区别在于item_list中的selectedList属性是item_list中masterList的子集

如您在示例中所见，masterList也可以有一个附加项

{
  name: "Cat 2",
  id: "cat2",
  is_multiselect: false,
  item_list: ["cat 2 1", "cat 2 2"],
}

[{
  category_id: 1,
  meta_list: [{
    name: "Cuisine",
    id: "QWEQWEQWE",
    is_multiselect: false,
    item_list: ["Arabian", "Indian"],
    sel_list: ["Arabian"]
  }, {
    name: "Cost for Two",
    id: "SFDFSDASDASDASD",
    is_multiselect: true,
    item_list: [
      "AED 0 - 100",
      "AED 100 - 200",
      "Greater Than AED 200"
    ],
    sel_list: [
      "AED 100 - 200",
      "Greater Than AED 200"
    ]
  }]
}, {
  category_id: 2,
  meta_list: [{
    name: "Cat 2",
    id: "cat2",
    is_multiselect: false,
    item_list: ["cat 2 1", "cat 2 2"],
    sel_list: ["cat 2 2"]
  }, {
    name: "cuisine 2",
    id: "cui2",
    is_multiselect: true,
    item_list: ["cu1", "cu2"],
    sel_list: ["cu1"]
  }]
}]

不在selectedList中。

我该如何实现？

编辑:我目前正在这样

masterList.forEach(cat_met_item => {
  selectedList.forEach(filled_cat_met_item => {
    if (cat_met_item.category_id === filled_cat_met_item.category_id) {
      cat_met_item.meta_list.forEach(met_item => {
        filled_cat_met_item.meta_list.forEach(filled_met_item => {
          if (met_item.id === filled_met_item.id) {
            met_item["list"] = filled_met_item["item_list"];
          }
        });
      });
    }
  });
});

使用4个forEach循环。我发现我的方法效率不高且非常凌乱，所以有更好的方法吗？

最佳答案

使用json过滤器方法:

let masterList = [
                {
                    category_id: 1,
                    meta_list: [
                        {
                            name: "Cuisine",
                            id: "QWEQWEQWE",
                            is_multiselect: false,
                            item_list: ["Arabian", "Indian"]
                        },

                        {
                            name: "Cost for Two",
                            id: "SFDFSDASDASDASD",
                            is_multiselect: true,
                            item_list: [
                                "AED 0 - 100",
                                "AED 100 - 200",
                                "Greater Than AED 200"
                            ]
                        }
                    ]
                },
                {
                    category_id: 2,
                    meta_list: [
                        {
                            name: "Cat 2",
                            id: "cat2",
                            is_multiselect: false,
                            item_list: ["cat 2 1", "cat 2 2"]
                        },

                        {
                            name: "cuisine 2",
                            id: "cui2",
                            is_multiselect: true,
                            item_list: ["cu1", "cu2"]
                        }
                    ]
                }
            ];

      let selectedList = [
                        {
                            category_id: 1,
                            meta_list: [
                                {
                                    name: "Cuisine",
                                    id: "QWEQWEQWE",
                                    is_multiselect: false,
                                    item_list: ["Arabian"]
                                },
                                {
                                    name: "Cost for Two",
                                    id: "SFDFSDASDASDASD",
                                    is_multiselect: true,
                                    item_list: [
                                        "AED 100 - 200",
                                        "Greater Than AED 200"
                                    ]
                                }
                            ]
                        },
                        {
                            category_id: 2,
                            meta_list: [
                                {
                                    name: "cuisine 2",
                                    id: "cui2",
                                    is_multiselect: true,
                                    item_list: ["cu1"]
                                }
                            ]
                        }
                    ];

masterList.forEach(cat_met_item => {
  var obj = selectedList.filter(function (el) {
    return cat_met_item.category_id === el.category_id;

  })
  cat_met_item.meta_list.forEach(met_item => {
      var selObj = obj[0].meta_list.filter(function (el) {
      return met_item.id === el.id;
    });
    if (selObj[0]) {
      met_item['sel_list'] = selObj[0].item_list;
    }
    else {
      met_item['sel_list'] = met_item.item_list[met_item.item_list.length - 1];
    }
  });
});

console.log(masterList);