skyfe79

func startGifAnimation(with url: URL?, in layer: CALayer?) {
        let animation: CAKeyframeAnimation? = animationForGif(with: url)
        if let animation = animation {
            layer?.add(animation, forKey: "contents")
        }
    }
    
func animationForGif(with url: URL?) -> CAKeyframeAnimation? {

    let animation = CAKeyframeAnimation(keyPath: "contents")

skyfe79

extension NSImage {
    
    /// Returns the height of the current image.
    var height: CGFloat {
        return self.size.height
    }
    
    /// Returns the width of the current image.
    var width: CGFloat {
        return self.size.width

skyfe79

all: pdf epub kindle html examples

BOOK_TITLE = A\ React\ Developer’s\ Guide\ to\ Hooks\ -\ Sebastien\ Castiel

dist:
	@mkdir -p dist

pdf: dist/${BOOK_TITLE}.pdf
	@echo '✅  PDF'

skyfe79

• Passwords will contain at least 1 upper case letter
• Passwords will contain at least 1 lower case letter
• Passwords will contain at least 1 number or special character
• There is no length validation (min, max) in this regex!

Regular expression for JavaScript:

/((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$/

skyfe79

[Isolating Differences Between Files][paper]

Advantage over Other Algorithms

The diff output is more specific:

[I]f a whole block of text is moved, then all of it, rather than just the beginning and end, is detected as changed.

>The algorithm described here avoids these difficulties. It detects differences that correspond very closely to our intuitive notion of difference.

skyfe79

import Foundation

// Very slightly adapted from http://stackoverflow.com/a/30141700/106244
// 99.99% Credit to Martin R!

// Mapping from XML/HTML character entity reference to character
// From http://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references
private let characterEntities : [String: Character] = [

skyfe79

#import <UIKit/UIKit.h>
#import <ImageIO/ImageIO.h>
#import <MobileCoreServices/MobileCoreServices.h>

static UIImage *frameImage(CGSize size, CGFloat radians) {
    UIGraphicsBeginImageContextWithOptions(size, YES, 1); {
        [[UIColor whiteColor] setFill];
        UIRectFill(CGRectInfinite);
        CGContextRef gc = UIGraphicsGetCurrentContext();
        CGContextTranslateCTM(gc, size.width / 2, size.height / 2);

skyfe79

String getJavaHome(String version)
{
    def stdout = new ByteArrayOutputStream()
    exec {
        commandLine "/usr/libexec/java_home", "-v", version
        standardOutput = stdout;
    }
    return stdout.toString().trim()
}

skyfe79

import GLKit
 
// Uniform index.
private enum Uniform {
    case ModelViewProjectionMatrix, NormalMatrix
}
private var gUniforms: [Uniform: GLint] = [:]
 
extension GLKMatrix3 {
    var array: [Float] {

skyfe79

#Intro

Kotlin is a new programming language for the JVM. It produces Java bytecode, supports Android and generates JavaScript. The latest version of the language is Kotlin M5.3

Kotlin project website is at kotlin.jetbrains.org.

All the codes here can be copied and run on Kotlin online editor.

Let's get started.