动态深度选择JavaScript对象

function deepSelect(obj, path) {
  const segments = path.split('.');
  let current = obj;

  for (let i = 0; i< segments.length; i++) {
    if (current[segments[i]] === undefined) {
      return undefined;
    }
    current = current[segments[i]];
  }

  return current;
}

const obj = {
  a: {
    b: {
      c: {
        d: 'Hello, world!'
      }
    }
  }
};

console.log(deepSelect(obj, 'a.b.c.d')); // 输出：'Hello, world!'
console.log(deepSelect(obj, 'a.b.c.x')); // 输出：undefined

const _ = require('lodash');

const obj = {
  a: {
    b: {
      c: {
        d: 'Hello, world!'
      }
    }
  }
};

console.log(_.get(obj, 'a.b.c.d')); // 输出：'Hello, world!'
console.log(_.get(obj, 'a.b.c.x')); // 输出：undefined