reduce解决读取多层嵌套对象属性

        在使用reduce时突然发现reduce似乎可以遍历对象嵌套结构

function getObjectPropertyValue(obj, propertyPath) {
  return propertyPath.split('.').reduce((result, key) => result[key], obj);
}

const person = {
  name: 'John',
  address: {
    city: 'New York',
    street: '123 ABC Street'
  }
};

const name = getObjectPropertyValue(person, 'name');
console.log(name); // John

const city = getObjectPropertyValue(person, 'address.city');
console.log(city); // New York

const street = getObjectPropertyValue(person, 'address.street');
console.log(street); // 123 ABC Street

        查询文档：Array methods

reduce/reduceRight

When we need to iterate over an array – we can use forEach, for or for..of.

When we need to iterate and return the data for each element – we can use map.

The methods