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radianttap/Dictionary-mapKeys.swift

Created April 12, 2019 14:12
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Dictionary, mapKeys (counterpart to mapValues)
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Dictionary-mapKeys.swift
public extension Dictionary {
func mapKeys<T>(_ transform: (Key) throws -> T) rethrows -> [T : Value] where T: Hashable {
var dict: [T: Value] = [:]
for (key, value) in self {
let newKey = try transform(key)
dict[newKey] = value
}
return dict
}
}
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