Remove array of objects from another array of objects

Question

Assume we have the following arrays of objects to be compared based on property id:

a = [{\'id\':\'1\', \'name\':\'a1\'}, {\'id\':\'2\', \'name\':\'         


        

Answer 1

Here is a nice one line answer :)

Basically, you can filter, as you were trying to do already. Then you can also filter b for each a element and if the length of the filtered b is zero, then you return true because that means the a element is unique to a.

var a = [{
  'id': '1',
  'name': 'a1'
}, {
  'id': '2',
  'name': 'a2'
}, {
  'id': '3',
  'name': 'a3'
}];

var b = [{
  'id': '2',
  'name': 'a2'
}];

c = a.filter( x => !b.filter( y => y.id === x.id).length);
console.log(c);