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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")

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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

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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'

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• 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]).*$/

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[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.

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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] = [

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#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);

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

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

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import Cocoa

indirect enum BST<T: Comparable> {
    case Leaf
    case Node(BST<T>, T, BST<T>)
}

var bst = BST.Node(.Leaf, 10, .Leaf)

extension BST {