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// add .identifier
let centerXConstraint = view.centerXAnchor.constraint(equalTo: centerXAnchor, constant: 0)
centerXConstraint.identifier = "IdentifierName"

// get constraint 
let constraintByIdentifier = view.constraints.filter ({ $0.identifier == "IdentifierName" }).first

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# taken from http://www.piware.de/2011/01/creating-an-https-server-in-python/
# generate server.xml with the following command:
#    openssl req -new -x509 -keyout server.pem -out server.pem -days 365 -nodes
# run as follows:
#    python simple-https-server.py
# then in your browser, visit:
#    https://localhost:4443

import BaseHTTPServer, SimpleHTTPServer
import ssl

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import Foundation

enum timingFunction{
    case Linear,EaseIn,EaseOut,EaseInOut,
    Spring,
    EaseInSine,EaseOutSine,EaseInOutSine,
    EaseInQuad,EaseOutQuad,EaseInOutQuad,
    EaseInCubic,EaseOutCubic,EaseInOutCubic,
    EaseInQuart,EaseOutQuart,EaseInOutQuart,
    EaseInQuint,EaseOutQuint,EaseInOutQuint,

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import Foundation
import UIKit

struct ViewStyle<T> {
    let style: (T) -> Void
}

let filled = ViewStyle<UIButton> {
    $0.setTitleColor(.white, for: .normal)
    $0.backgroundColor = .red

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xcrun simctl spawn booted log config --mode "level:off" --subsystem com.apple.CoreTelephony

# source: https://github.com/aws-amplify/aws-sdk-ios/issues/1251#issuecomment-471866504

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extension UIView {
    func firstSuperview<T>(where predicate: (T) -> Bool) -> T? where T: UIView {
        if let superview = superview as? T, predicate(superview) {
            return superview
        }
        return superview?.firstSuperview(where: predicate)
    }
}

// view.firstSuperview(where: { (view: UITableView) in view.isEditing })

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extension UIColor {
    
    // get a complementary color to this color
    // https://gist.github.com/klein-artur/025a0fa4f167a648d9ea
    var complementary: UIColor {

        let ciColor = CIColor(color: self)

        // get the current values and make the difference from white:
        let compRed: CGFloat = 1.0 - ciColor.red

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//Inspired by: http://planetozh.com/blog/2012/10/generate-random-pronouceable-words/
func randomWord(wordLength: Int = 6) -> String {
    
    let kCons = 1
    let kVows = 2
    
    var cons: [String] = [
        // single consonants. Beware of Q, it"s often awkward in words
        "b", "c", "d", "f", "g", "h", "j", "k", "l", "m",
        "n", "p", "r", "s", "t", "v", "w", "x", "z",

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let emitterLayer = CAEmitterLayer()
        emitterLayer.frame = navigationView.bounds
        emitterLayer.renderMode = .additive
        emitterLayer.emitterMode = .outline
        emitterLayer.emitterShape = .line
        emitterLayer.emitterSize = CGSize(width: 50, height: 0)
        emitterLayer.emitterPosition = CGPoint(x: navigationView.bounds.width / 2, y: navigationView.bounds.height)
        emitterLayer.velocity = 1
        emitterLayer.seed = (arc4random() % 100) + 1
        navigationView.layer.insertSublayer(emitterLayer, at: 0)

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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