算法-将对象的键从下划线形式转换为驼峰

没啥难度，考察对api的熟练程度和一点递归思想（有点类似深拷贝），直接看代码吧：

let snakeToCamel = (str) => {
  let parts = str.split("_");
  let camelParts = parts.map((item, index) => {
    if (index === 0) return item;
    else return item[0].toUpperCase() + item.slice(1);
  });
  return camelParts.join("");
};

let convert = (obj) => {
  if (typeof obj !== "object" || obj === null) return obj;
  let newObj = {};

  for (let key of Object.keys(obj)) {
    let newKey = snakeToCamel(key);
    newObj[newKey] = convert(obj[key]);
  }
  return newObj;
};

测试：

const inputObj = {
  first_name: "John",
  last_name: "Doe",
  address_info: {
    street_name: "123 Main St",
    city_name: "Example City",
  },
};

const outputObj = convert(inputObj);
console.log(outputObj);

// 结果
{
  firstName: 'John',
  lastName: 'Doe',
  addressInfo: { streetName: '123 Main St', cityName: 'Example City' }
}