// 
// Copyright 2022 New Vector Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

extension Sequence {
    func group<GroupID: Hashable>(by keyPath: KeyPath<Element, GroupID>) -> [GroupID: [Element]] {
        var result: [GroupID: [Element]] = .init()
        
        for item in self {
            let groupId = item[keyPath: keyPath]
            result[groupId] = (result[groupId] ?? []) + [item]
        }
        
        return result
    }
}