ha1f

import Foundation

/// Debouncer is useful for situations like following.
/// If we want to execute action n sec after the last trigger.
public final class Debouncer<T> {
    let dispatchQueue: DispatchQueue
    let interval: TimeInterval
    let action: (T) -> Void

    private var _lastDispatchTime: DispatchTime?

ha1f

import Foundation
// import EthereumKit
// import Play

final class Lets {
    private let nyanWallet = Wallet("💰")
    private let nyan = Haruna("🐈")
    
    func go(to place: String) {
        nyan.move(to: place)

ha1f

extension UIImage {
    /// CGAffineTransform to apply orientation of the image
    var orientationTransformer: CGAffineTransform {
        var transform = CGAffineTransform(translationX: size.width / 2, y: size.height / 2)
        switch imageOrientation {
        case .up, .upMirrored:
            break
        case .down, .downMirrored:
            transform = transform.rotated(by: CGFloat.pi)
        case .left, .leftMirrored:

ha1f

import Foundation

extension Array {
    /// Returns unique pairs from array
    /// Following is result of `[1, 2, 3, 4].pairs()`
    /// [(1, 2), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)]
    func pairs() -> [(Element, Element)] {
        return enumerated()
            .flatMap { index, element in
                dropFirst(index.advanced(by: 1))

ha1f

//
//  Zip3Sequence.swift
//
//  Created by はるふ on 2018/05/28.
//  Copyright © 2018年 ha1f. All rights reserved.
//

import Foundation

/// An iterator for `Zip3Sequence`.

ha1f

//
//  NthTimeLucky.swift
//
//  Created by はるふ on 2018/05/24.
//  Copyright © 2018年 ha1f. All rights reserved.
//

import Foundation
import RxSwift

ha1f

enum ExpressionError: Error {
    case invalidInput
    case failedParsingValue
    case unknown
}

indirect enum Expression {
    case value(Double)
    case plus(Expression, Expression)
    case minus(Expression, Expression)

ha1f

import Foundation

extension UnicodeScalar {
    /// `a-z{
    var isLowerCase: Bool {
        return value >= 0x61 && value <= 0x7a
    }
    
    /// @A-Z[
    var isUpperCase: Bool {

ha1f

class PrintingViewController: UIViewController {
    
    // Load
    
    override func loadView() {
        super.loadView()
        print("lifecycle", #function)
    }
    
    override func viewDidLoad() {

ha1f

//
//  QrCodeGenerator.swift
//  CoreImageSample
//
//  Created by はるふ on 2017/12/11.
//  Copyright © 2017年 ha1f. All rights reserved.
//

import Foundation
import CoreImage