Js filters the tree structure data according to a certain attribute to obtain a new tree structure.

requirements as above, the data are as follows 

      data= [
        {
          id: 0,
          event: "1",
          timeLine: 50,
          comment: "",
                    age:13
        },
        {
          id: 1,
          event: "1",
          timeLine: 100,
          comment: "",
                    age:13
          children: [
            {
              id: 2,
              event: "2",
              timeLine: 10,
              comment: "",
                            age:11
            },
            {
              id: 3,
              event: "3",
              timeLine: 90,
              comment: "",
                            age:13
              children: [
                {
                  id: 4,
                  event: "4",
                  timeLine: 5,
                  comment: "",
                                    age:17
                },
                {
                  id: 5,
                  event: "5",
                  timeLine: 10,
                  comment: "",
                                    age:13
                },
                {
                  id: 6,
                  event: "6",
                  timeLine: 75,
                  comment: "",
                                    age:13
                  children: [
                    {
                      id: 7,
                      event: "7",
                      timeLine: 50,
                      comment: "",
                                            age:13
                      children: [
                        {
                          id: 71,
                          event: "71",
                          timeLine: 25,
                          comment: "xx",
                                                    age:18
                        },
                        {
                          id: 72,
                          event: "72",
                          timeLine: 5,
                          comment: "xx",
                                                    age:13
                        },
                        {
                          id: 73,
                          event: "73",
                          timeLine: 20,
                          comment: "xx",
                                                    age:15
                        }
                      ]
                    },
                    {
                      id: 8,
                      event: "8",
                      timeLine: 25,
                      comment: "",
                                            age:19
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]

now we want to filter data according to the attribute that age is 13, get a new tree structure, and find a recursive method

.
Javascript
Jun.21,2022

wrote one recursively and checked the output manually seems to be no problem. Errors can occur when using other data. Anyway, the train of thought is, if there is a mistake, it should not be difficult to correct. 

var newarr = []
function render (arr, newarr) {
        let i = 0
        let len = arr.length
        for (;i < len; iPP) {
          if (arr[i].age == 13){
            newarr.push({event: arr[i].event, id: arr[i].id,age:arr[i].age})
          }
          if (arr[i].children && arr[i].children.length > 0) {
            render(arr[i].children, newarr)
          }
        }
        return newarr
      }
render(data,newarr)
console.log(newarr)

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