Deleting Keys

Keys can be deleted from maps using the Map.delete and Map.deleteIn methods.

let movie = Immutable.fromJS({
    name: 'Star Wars',
    episode: 7,
    actors: [
        { name: 'Daisy Ridley', character: 'Rey'},
        { name: 'Harrison Ford', character: 'Han Solo' }
    ],
    mpaa: {
        rating: 'PG-13',
        reason: 'sci-fi action violence'
    }
});

movie = movie.delete('mpaa');

console.log(movie.toObject());

/* writes
{ name: 'Star Wars',
  episode: 7,
  actors: List [ Map { "name": "Daisy Ridley", "character": "Rey" }, Map { "name": "Harrison Ford", "character": "Han Solo" } ] }
*/