redux/examples/tree-view/generateTree.js

export default function generateTree() {
  let tree = {
    0: {
      id: 0,
      counter: 0,
      childIds: []
    }
  }

  for (let i = 1; i < 1000; i++) {
    let parentId = Math.floor(Math.pow(Math.random(), 2) * i)
    tree[i] = {
      id: i,
      counter: 0,
      childIds: []
    }
    tree[parentId].childIds.push(i)
  }

  return tree
}