get Nested Object value without using if conditions

getNestedValue.js

const obj = {
  class: {
    stu1: {
      name: 'Andy'
    },
    stu2: {
      name: 'John'
    }
  }
};

Object.prototype.getNestedValue = function(props) {
  return props.reduce((acc, val) => (acc && acc[val]) ? acc[val] : undefined, this);
}

console.log(obj.getNestedValue(['class', 'stu1', 'name'])); // Andy
console.log(obj.getNestedValue(['class', 'stu3', 'name'])); // undefined

awesome