javascript - 通过对象的 id 在 javascript 数组中查找和移动对象

Question

我有 2 个对象数组。每个对象都有一个 Id 属性。现在，如果我有一个只有 ID 的第三个数组，那么根据这些 ID 从 array1 中查找对象并将它们移动到 array2 的更好更快的方法是什么。

非常感谢您的回答..

示例代码:

Person = function(id, fn, ln) {
  this.id = id,
  this.firstName = fn,
  this.lastName = ln
}

array1 = new Array();
// add 500 new Person objects to this array

array2 = new Array();
// add some other new Person objects to this array

function moveArrayItems(ids) {
  // ids is an array of ids e.g. [1,2,3,4,5,6,...]
  // Now I want to find all the person objects from array1 whose ids 
  // match with the ids array passed into this method. Then move them to array2.
  // What is the best way to achive this?
}

Answer 1

如果每个数组中确实有 500 多个对象，您最好使用散列来存储对象，以 id 为键:

var people = {
              1: {id:1, name:"George Washington"},
              2: {id:2, name:"John Adams"},
              3: {id:3, name:"Thomas Jefferson"},  // ...
             } 

var people2 = {}

现在通过 ID 移动东西很简单(而且快得多):

function moveArrayItems(ids) {
    var i,id;
    for (i=0; i<ids.length; i++){
        id = ids[i];
        if (people1[id]) {
            people2[id] = people1[id];
            delete people1[id];
        }
    }
}