tree_search.js

const tree = {
  name: "A",
  children: [
    { name: "A-1", children: [{ name: "A-1-A" }, { name: "A-1-B" }] },
    {
      name: "B-1",
      children: [
        { name: "B-1-A", children: [{ name: "B-11-A" }, { name: "B-11-B" }] },
        { name: "B-1-B" }
      ]
    }
  ]
};
const searchFn = (tree, name) => {
  let result = null;
  if (typeof tree !== "object") return result;
  if (tree.name === name) return tree;
  if (tree.children && tree.children.length) {
    tree.children.some(data => (result = searchFn(data, name)));
  }
  return result;
};
console.log(searchFn(tree, "A-1-A"));
console.log(searchFn(tree, "A-1"));
console.log(searchFn(tree, ""));