如何在深层嵌套数组中找到具有id值的对象？

Question

给定这个结构,我如何在这个深层嵌套的对象结构中找到具有给定id的对象.

const menuItems = [
    {
        id: 1,
        imageUrl: "http://placehold.it/65x65",
        display: "Shop Women",
        link: "#",
        type: "image",
        nextItems: [
            {
                id: 10,
                display: "?",
                link: "#",
                type: "menuitem"
            },
            {
                id: 20,
                display: "??",
                link: "#",
                type: "menuitem-withmore",
                nextItems: [
                    {
                        id: 100,
                        display: "I'm inside one nest",
                        link: "#",
                        type: "menuitem"
                    }
                ]
            },
            {
                id: 30,
                display: "??",
                link: "#",
                type: "menuitem-withmore",
                nextItems: []
            },
            {
                id: 40,
                display: "??",
                link: "#",
                type: "menuitem-withmore",
                nextItems: []
            },
            {
                id: 50,
                display: "????",
                link: "#",
                type: "menuitem-withmore",
                nextItems: []
            },
            {
                id: 60,
                display: "SALE",
                link: "#",
                type: "menuitem-withmore",
                style: "bold",
                nextItems: []
            },
            {
                id: 70,
                display: "???",
                link: "#",
                type: "menuitem-withmore",
                nextItems: []
            },
            {
                type: "separator"
            },
            {
                id: 80,
                display: "?????",
                link: "#",
                type: "menuitem"
            },
            {
                id: 90,
                display: "????",
                link: "#",
                type: "menuitem"
            },
            {
                id: 99,
                display: "? ????",
                link: "#",
                type: "menuitem"
            }
        ]
    },
    {
        id: 2,
        imageUrl: "http://placehold.it/65x65",
        display: "Shop Men",
        link: "#",
        type: "image",
        nextItems: [
            {
                id: 95,
                display: "MEN's ITEMS.",
                link: "#",
                type: "menuitem"
            }
        ]
    }
];

假设我想找到对象id: 20并返回:

        {
            id: 20,
            display: "??",
            link: "#",
            type: "menuitem-withmore",
            nextItems: [
                {
                    id: 100,
                    display: "I'm inside one nest",
                    link: "#",
                    type: "menuitem"
                }
            ]
        },

我似乎无法找到如何使用lodash,并且这个包可能已经解决了我的问题,但我无法理解如何使它适用于我的用例.

https://github.com/dominik791/obj-traverse

Answer 1

使用DFS.

const menuItems = [
    {
        id: 1,
        imageUrl: "http://placehold.it/65x65",
        display: "Shop Women",
        link: "#",
        type: "image",
        nextItems: [
            {
                id: 10,
                display: "?",
                link: "#",
                type: "menuitem"
            },
            {
                id: 20,
                display: "??",
                link: "#",
                type: "menuitem-withmore",
                nextItems: [
                    {
                        id: 100,
                        display: "I'm inside one nest",
                        link: "#",
                        type: "menuitem"
                    }
                ]
            },
            {
                id: 30,
                display: "??",
                link: "#",
                type: "menuitem-withmore",
                nextItems: []
            },
            {
                id: 40,
                display: "??",
                link: "#",
                type: "menuitem-withmore",
                nextItems: []
            },
            {
                id: 50,
                display: "????",
                link: "#",
                type: "menuitem-withmore",
                nextItems: []
            },
            {
                id: 60,
                display: "SALE",
                link: "#",
                type: "menuitem-withmore",
                style: "bold",
                nextItems: []
            },
            {
                id: 70,
                display: "???",
                link: "#",
                type: "menuitem-withmore",
                nextItems: []
            },
            {
                type: "separator"
            },
            {
                id: 80,
                display: "?????",
                link: "#",
                type: "menuitem"
            },
            {
                id: 90,
                display: "????",
                link: "#",
                type: "menuitem"
            },
            {
                id: 99,
                display: "? ????",
                link: "#",
                type: "menuitem"
            }
        ]
    },
    {
        id: 2,
        imageUrl: "http://placehold.it/65x65",
        display: "Shop Men",
        link: "#",
        type: "image",
        nextItems: [
            {
                id: 95,
                display: "MEN's ITEMS.",
                link: "#",
                type: "menuitem"
            }
        ]
    }
];

function dfs(obj, targetId) {
  if (obj.id === targetId) {
    return obj
  }
  if (obj.nextItems) {
    for (let item of obj.nextItems) {
      let check = dfs(item, targetId)
      if (check) {
        return check
      }
    }
  }
  return null
}

let result = null

for (let obj of menuItems) {
  result = dfs(obj, 100)
  if (result) {
    break
  }
}

console.dir(result)