将数组转换为对象树[JS]

function arrayToTree(arr) {
  let tree = {};
  
  arr.forEach((item, index) => {
    let keys = item.split('.');
    let currentNode = tree;
    
    keys.forEach((key, i) => {
      if (!currentNode[key]) {
        currentNode[key] = {};
      }
      
      if (i === keys.length - 1) {
        currentNode[key] = index;
      } else {
        currentNode = currentNode[key];
      }
    });
  });
  
  return tree;
}

// 示例用法
let arr = ['a.b.c', 'a.b.d', 'a.e', 'f'];
let tree = arrayToTree(arr);
console.log(tree);

{
  "a": {
    "b": {
      "c": 0,
      "d": 1
    },
    "e": 2
  },
  "f": 3
}