通过对象的键数组来分解对象

let obj = {a: "John", b: "Sarah", c: "Lara", d: "Joseph", e: "Roger"}
let arr_of_keys = ["a", "d", "e", "f"];

var result = arr_of_keys.reduce(function(o,item){

	if(obj.hasOwnProperty(item)){
  	o[item] = obj[item]; 
  }
  
  return o;
}, {});

console.log(result)

const obj = {a: "John", b: "Sarah", c: "Lara", d: "Joseph", e: "Roger"}

const arr_of_keys = ["a", "d", "e"];


const customObjectDescructurer = (arrayOfDesiredPropKeys, object) => {

  const setOfDesiredPropKeys = new Set(arrayOfDesiredPropKeys);
  
  const filteredObject = [...setOfDesiredPropKeys].reduce(
    (filteredObject, desiredPropKey) => {
      if(object.hasOwnProperty(desiredPropKey)){
        filteredObject[desiredPropKey] = object[desiredPropKey];
      } else {
        console.error(`
          The given ${desiredPropKey}, does not exist in ${object} object.
        `);
      }
      return filteredObject;
    }, {});

  return filteredObject;
  
}


const desiredKeys = customObjectDescructurer(arr_of_keys, obj);

console.log(desiredKeys);