Question 179087 in Javascript Question posted in
A very good W3school tutorial can be found here.

How many levels are in a Javascript array?

The user has children, children also have children as in the code example. There are a maximum of 5 such levels, but maybe less, 2, 3. My task is to iterate each level and return the number of children the user has at each level. I have been unable to solve this problem for two days now. help me please

"children": [
        {
            "id": "7b3602fa-0df3-4170-9248-9a5df00b0bd7",
            "name": "Rick Rich",
            "email": "[email protected]",
            "role": "user",
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                                    "children": [
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                                            "id": "042681be-f521-40af-a1dd-a1591700f8e0",
                                            "name": "Rick Rich",
                                            "email": "[email protected]",
                                            "role": "user",
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                                            "children": []
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                                            "role": "user",
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                                                    "parentId": "997e02a7-1bb7-473f-8ff8-5eb76d8d309b",
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                                                    "isActivate": false,
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                                                    "role": "user",
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Tags:

3

Answers


  1. 0

    i think this may be what you are looking for?

    result = [];
function recurse(level, obj) {
    if(obj.children) {
        result[level] = obj.children.length + (result[level] === undefined ? 0 : result[level]);
        for(i in obj.children)
            recurse((level + 1), obj.children[i]);
    }
}
recurse(0, data);
console.log(result);
    Login or Signup to reply.
  2. 0

    You could use a DFS algorithm to iterate all children notes with recursion:

    const count = (children, arr = [], level = 0) => {
    children.forEach(node => {
        arr[level] = (arr[level] || 0) + 1;
        if (node.children) {
            count(node.children, arr, level + 1);
        }
    })

    return arr;
};

const output = count(data.children);

    const data = {
    "children": [
        {
            "id": "7b3602fa-0df3-4170-9248-9a5df00b0bd7",
            "name": "Rick Rich",
            "email": "[email protected]",
            "role": "user",
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            "walletAmount": 0,
            "deposit": 0,
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            "referralChildDeposit": 0,
            "children": [
                {
                    "id": "ddf86d60-a607-4a4e-a7f9-d96013ee7070",
                    "name": "Rick Rich",
                    "email": "[email protected]",
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const count = (children, arr = [], level = 0) => {
    children.forEach(node => {
        arr[level] = (arr[level] || 0) + 1;
        if (node.children) {
            count(node.children, arr, level + 1);
        }
    })

    return arr;
};

const output = count(data.children);

console.log(output);
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  3. 0

    Its not Particularly elegant like the other answers but this is an easy way of understanding how it works:

    let firstLayer = children.length
let secondLayer = 0
let thirdLayer = 0
let fourthLayer = 0
let fifthLayer = 0
let sixfthLayer = 0

for (let i = 0; i < children.length; i++) {
  secondLayer += children[i].children.length
  for (let j = 0; j < children[i].children.length; j++) {
    thirdLayer += children[i].children[j].children.length
    for(let f = 0; f < children[i].children[j].children.length; f++) {
      fourthLayer += children[i].children[j].children[f].children.length
      for (let e = 0; e < children[i].children[j].children[f].children.length; e++) {
        fifthLayer += children[i].children[j].children[f].children[e].children.length
        for (let g = 0; g < children[i].children[j].children[f].children[e].children.length; g++) {
          sixfthLayer += children[i].children[j].children[f].children[e].children[g].children.length
        }
      }
    }
  }
}
const output = [firstLayer, secondLayer, thirdLayer, fourthLayer, fifthLayer, sixfthLayer]
console.log(output)

    nested For loops loop through the children and add to the layers total only problem with this is its not scalable with more layers
    Hopefully this helps you understand.

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