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public extension Bool {
    var not: Bool { !self }
}


// zip
public extension Optional {
    static func zip<B>(
        _ a: Wrapped?,
        _ b: B?

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private extension Array {
  func chunked(into size: Int) -> [[Element]] {
      stride(from: 0, to: count, by: size).map {
          Array(self[$0 ..< Swift.min($0 + size, count)])
      }
  }

  static func += (lhs: inout Self, rhs: Self.Element) {
      lhs.append(rhs)
  }

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// MARK: Optional

public extension Optional where Wrapped == String {
    var orEmpty: String { self ?? "" }

    var isNilOrEmpty: Bool {
        orEmpty.isEmpty
    }

    var isNotNilNorEmpty: Bool {

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private func filter(searchText: String, using keyPath: KeyPath<Object, String>) -> [Object] {
    originalList.filter {
        let value = $0[keyPath: keyPath]
        return value == searchText
    }
}

private func filter(searchText: String, using matcher: @escaping (Object, String) -> Bool) -> [Object] {
    originalList.filter { object in
        matcher(object, searchText)

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static func isOutdated(thisVersion: String, comparisonVersion: String) -> Bool {
    
    let thisVersionComponents = thisVersion.components(separatedBy: ".")
    let comparisonVersionComponents = comparisonVersion.components(separatedBy: ".")
    
    let thisVersionNumbers: [Int] = thisVersionComponents.map { Int($0) ?? 0 }
    let comparisonVersionNumbers: [Int] = comparisonVersionComponents.map { Int($0) ?? 0 }
    
    for i in 0 ..< 3 {
        if thisVersionNumbers[i] > comparisonVersionNumbers[i] {

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--------------
- Rx testing:
--------------
https://github.com/ReactiveX/RxSwift/blob/master/Documentation/UnitTests.md
http://rx-marin.com/post/rxswift-rxtests-unit-tests/
http://rx-marin.com/post/rxblocking-part1/
http://adamborek.com/rxtests-rxactionsheet/

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let granularity = Calendar.Component.day
let comparisonResult = Calendar.current.compare(firstDate, to: secondDate, toGranularity: granularity)

// granularity:
// .second
// .minute
// .hour
// .day
// .month
// .year

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class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.addGestureRecognizer(UITapGestureRecognizer(target: self.view, action: #selector(UIView.endEditing(_:))))     
    }
}

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import Foundation

extension String {

    public var upperCasedFirstLetter: String {
        prefix(1).uppercased() + dropFirst()
    }

    public var lowerCasedFirstLetter: String {
        prefix(1).lowercased() + dropFirst()

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func convertToValidInt(amount: String) -> Int?
	if amount != "" {
		let badCharacters = CharacterSet.decimalDigits.inverted
		if amount.rangeOfCharacter(from: badCharacters) == nil {
			if let amount = Int(amount) {
				if amount > 0 {
					return amount
				}
			}
		}