mirror of
https://github.com/firebase/firebase-ios-sdk
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33 lines
1.3 KiB
Swift
33 lines
1.3 KiB
Swift
/*
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* Copyright 2026 Google LLC
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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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public extension Sequence {
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/// Creates a dictionary with sequence elements keyed by the property at the given key path.
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///
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/// If multiple elements produce duplicate keys, the first element encountered is preserved.
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///
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/// ```swift
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/// let targets = [targetA, targetB]
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/// let targetMap = targets.keyedBy(\.name)
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/// ```
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///
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/// - Parameter keyPath: The key path on `Element` used to extract each dictionary key.
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/// - Returns: A dictionary mapping extracted keys to their corresponding elements.
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func keyedBy<Key: Hashable>(_ keyPath: KeyPath<Element, Key>) -> [Key: Element] {
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Dictionary(map { ($0[keyPath: keyPath], $0) }, uniquingKeysWith: { first, _ in first })
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}
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}
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