Lodash检查数组中的任何对象是否包含与另一个数组匹配的ID

Question

I have one user array like:

var users = [{
 id: 1,
 name: 'ABC',
 isDisplay: true
}, {
 id: 2,
 name: 'XYZ',
 isDisplay: true
}, {
 id: 3,
 name: 'JKL',
 isDisplay: true
}];

And another array selectedUsers which contains some object from above array like:

var selectedUsers = [{
 id: 1,
  name: 'ABC'
 },
 {
  id: 3,
  name: 'JKL'
}];

Not with lodash, i want to indentify which object are present in second array with matching its ID .

 _.each(users, (_u) => {
     if(selectedUsers.includes(_u)) {
       _u.isDisplay = false;
     } else {
       _u.isDisplay = true;
     }
  });

I have tried to match whole object with includes but it dint work, because i am using angularjs, so angular put some $$hashkey with object, so it will not match, Is there any other way to do this.

Answer 1

 var users = [{ id: 1, name: 'ABC', isDisplay: true }, { id: 2, name: 'XYZ', isDisplay: true }, { id: 3, name: 'JKL', isDisplay: true }]; var selectedUsers = [{ id: 1, name: 'ABC' }, { id: 3, name: 'JKL' }]; var intersection = _.intersectionBy(users, selectedUsers, 'id'); console.log(intersection); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.13.1/lodash.js"></script> 

Answer 2

Create a Set of selected ids ( selectedUsersIds ). Iterate the users array with Array#forEach , assign the value of isDisplay by checking if the id exists in the selectedUsersIds set:

 const users = [{"id":1,"name":"ABC","isDisplay":true},{"id":2,"name":"XYZ","isDisplay":true},{"id":3,"name":"JKL","isDisplay":true}]; const selectedUsers = [{"id":1,"name":"ABC"},{"id":3,"name":"JKL"}]; const selectedUsersIds = new Set(selectedUsers.map(({ id }) => id)); users.forEach((u) => u.isDisplay = selectedUsersIds.has(u.id)); console.log(users);