[JavaScript] Hashmap of hashmaps

hashmap-of-hashmaps.js

function generate(...input) {
  const tree = {'': {}};
  for (const text of input) {
      let currentNode = tree[''];
      Array.from(text).forEach(char => {
        if (!currentNode[char]) {
          currentNode[char] = {};
        }
        currentNode = currentNode[char]
      })
  }
  return tree;
}

generate('cagatay', 'cali')
// {"":{"c":{"a":{"g":{"a":{"t":{"a":{"y":{}}}}},"l":{"i":{}}}}}}