29 lines
963 B
Swift
29 lines
963 B
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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extension Sequence {
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func group<GroupID: Hashable>(by keyPath: KeyPath<Element, GroupID>) -> [GroupID: [Element]] {
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var result: [GroupID: [Element]] = .init()
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for item in self {
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let groupId = item[keyPath: keyPath]
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result[groupId] = (result[groupId] ?? []) + [item]
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}
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return result
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}
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}
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