20 lines
523 B
Swift
20 lines
523 B
Swift
//
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// Copyright 2022-2024 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only
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// Please see LICENSE in the repository root for full details.
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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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