Code Snippet for http://vichudson1.micro.blog/2018/05/26/health-up-diaries.html

HelperTypes.swift

public enum Result<Value, Error> {
    case success(Value)
    case failure(Error)
}

public enum HealthUpQueryError: Error {
    case noSamplesReturned
    case undefinedError
}

public typealias BaseSampleResult = Result<[HKSample], Error>
public typealias BaseSampleQueryResultsHandler = (HKQuery , BaseSampleResult) -> ()

public typealias QuantitySampleResult = Result<[HKQuantitySample], Error>
public typealias QuantitySampleQueryResultsHandler = (HKQuery , QuantitySampleResult) -> ()

public typealias CategorySampleResult = Result<[HKCategorySample], Error>
public typealias CategorySampleQueryResultsHandler = (HKQuery ,CategorySampleResult) -> ()