create tree from paths string.

createTreeFromPaths.js

const createNode = ([
    lvl, text, path,
    value,
    key,
    parentKey,
  ]) => ({
    value,
    lvl, text, path,
    key,
    parentKey,
    children: [],
  });

const insertNode = (node, data) => {
  if (data.parentKey === node.key && 
   node.children.every(x => x.key !== data.key)) {
    node.children.push(data);
    return node;
  }

  return node.children.reduce((acc, n) =>
      insertNode(n, data) && acc, node);
};

const createTreeFromPath = (data) =>
  data.reduce((acc, pth) =>
    acc.push(pth.split('/').reduce((prev, txt, lvl) =>
        prev.push([
          lvl, txt, pth,
          pth.split('/').slice(0, lvl + 1).join('/'),
          `${lvl}--${txt}`,
          !prev.slice().pop()
            ? null
            : `${prev[lvl - 1][0]}--${prev[lvl - 1][1]}`
        ]) && prev, [])
    ) && acc
  , [])
  .reduce((acc, n) => [...acc, ...n])
  .map(n => createNode(n))
  .reduce((root, n) => insertNode(root, n, root), { children: [], key: null });

usage:

console.log(createTreeFromPath([
  'beverages/softdrinks/coke/coke-zero',
  'beverages/softdrinks/coke/coke-sakto',
  'beverages/beer/pale pilsen',
  'beverages/beer/red horse',
  'beverages/beer/colt 45',
  'condiments/sweets/sugar',
  'condiments/sweets/brown sugar',
  'condiments/sweets/black sugar',
  'condiments/sweets',
]))```