daehn

extension DispatchQueue {

    /// Helper method to use when reading from a resource
    /// that is being isolated by this queue.
    ///
    /// Using this method retriving a value like this:
    /// ```
    /// var result: T?
    /// queue.sync {
    ///     result = resource["key"]

daehn

class Throttle {

    let delay: TimeInterval
    private var workItem: DispatchWorkItem?
    private let queue: DispatchQueue

    init(delay: TimeInterval, queue: DispatchQueue = .main) {
        self.delay = delay
        self.queue = queue
    }

daehn

import UIKit
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true


extension Comparable {
    /// Clamp the value between `low` and `high`
    func clamp(_ low: Self, _ high: Self) -> Self {

daehn

struct Car {
    let made: String
}

func compareDumps(lhs: Any, rhs: Any) -> Bool {
    var (lhsDump, rhsDump) = (String(), String())
    dump(lhs, to: &lhsDump)
    dump(rhs, to: &rhsDump)
    return lhsDump == rhsDump
}

daehn

import Foundation

// Defining this breaks the behaviour of the existing '||' operator in some cases
public func ||(lhs: NSPredicate, rhs: NSPredicate) -> NSPredicate {
    return NSCompoundPredicate(orPredicateWithSubpredicates: [lhs, rhs])
}

func foo() {
    let cards = [String: [String]]()
    let startingContactIndex: UInt = 3

daehn

public extension UIView {

    static var debugColors: [UIColor] {
        return [
            .red,
            .green,
            .blue,
            .cyan,
            .yellow,
            .magenta,

daehn

extension Equatable {
    func oneOf(other: Self...) -> Bool {
        return other.contains(self)
    }
}

daehn

import UIKit

/// Object observing keyboard changes and passing a `KeyboardChangeInfo` to notify about changes.
final class KeyboardObserver: NSObject {

    typealias KeyboardChangeClosure = (KeyboardChangeInfo) -> Void
    let changeClosure: KeyboardChangeClosure

    // MARK: - Private

daehn

import Foundation

struct Change<T>: CustomDebugStringConvertible {
    let oldValue, newValue: T?
    
    var debugDescription: String {
        let prettyString: T? -> String = { return $0 != nil ? "\($0!)" : ".None" }
        return "ChangeType:\n\tOld value: \(prettyString(oldValue))\n\tNew value: \(prettyString(newValue))"
    }
}

daehn

public struct CountedSet<Element : Hashable> : Hashable, CollectionType, ArrayLiteralConvertible {

    public typealias Index = SetIndex<Element>
    public typealias Generator = SetGenerator<Element>
    private var backingSet = Set<Element>()
    private var countMapping = [Int: UInt]()

    private var debugCountMapping: [Element : UInt] {
        var result = [Element : UInt]()
        backingSet.forEach { element in