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

First, you build just a map of the ids you want to delete. Then, you filter your first array with it, like that:

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

var idsToDelete = b.map(function(elt) {return elt.id;});
var result = a.filter(function(elt) {return idsToDelete.indexOf(elt.id) === -1;});
console.log(result)