Remove array of objects from array of objects with Jquery or JavaScript

Question

Might be duplicate, but I couldn't find it. So I have two arrays of objects:

var a = [{id: '1', name: 'bob'}, {id: '2', name: 'bill'}]
$scope.b = [{id: '4', name: 'jack'}, {id: '2', name: 'bill'}, {id: '1', name: 'bob'}, {id: '3', name: 'john'}]

I want to remove all the a elements from b. I have tried:

$scope.b = $scope.b.filter(function(item){
   return a.indexOf(item) === -1;
});

unfortunately, for some reason, the index is always -1, so nothing gets deleted. with some console.log-s

console.log(item);
console.log(a);
console.log(a.indexOf(item));

, this is how the data looks like:

Resource {id: 4, name: "jack"}
[Resource, Resource, Resource, Resource, $promise: Promise, $resolved: true]
-1

indexOf is looking for a reference to the same object - they're not. Do you want to delete by id? or perhaps only when id and name match? — Jamiec
– Jamiec, Commented Feb 16, 2015 at 13:03
by id would be fine (some text to fill in the required length of this input) — bokkie
– bokkie, Commented Feb 16, 2015 at 13:04

Oleksandr T. · Accepted Answer · 2015-02-16 13:03:16Z

2

You can do it like this

// get all id's from a
var a = [{id: '1', name: 'bob'}, {id: '2', name: 'bill'}].map(function (el) {
    return el.id;
});

// search item.id in array with id's
$scope.b = $scope.b.filter(function(item){
   return a.indexOf(item.id) === -1;
});

answered Feb 16, 2015 at 13:03

Oleksandr T.

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2 Comments

bokkie Over a year ago

@phari - it actually works, am I doing something so wrong that it went right? :)) Alexander - you're the king of everything! :)) thanks a lot!

bokkie Over a year ago

@phari - well, it is not really "a", it is users, and I get all the users from the db. I have changed the above code a bit into: userIds = users.map(...); and return userIds.indexOf(item.id) === -1;

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