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Swift Functional Programming - Second Edition by Dr. Fatih Nayebi

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<|| operator

The <|| operator is used to decode an array of values at a specific key into the requested type:

public func <|| <A: Decodable>(json: JSON, keys: [String]) -> Decoded<[A]> where A == A.DecodedType {     return flatReduce(keys, initial: json, combine: decodedJSON) >>-       Array<A>.decode } 

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