erica

// Returns `URL?`
public enum SocketEndPoint: String {
    case eventSocket = "http://nowhere.com/events"
    case liveSocket = "http://nowhere.com/live"
    
    public var url: URL? {
        return URL(string: self.rawValue)
    }
}

erica

import PlaygroundSupport
import SwiftUI
extension UIView {
  var renderedImage: UIImage {
    let image = UIGraphicsImageRenderer(size: self.bounds.size).image { context in
      UIColor.lightGray.set(); UIRectFill(bounds)
      context.cgContext.setAlpha(0.75)
      self.layer.render(in: context.cgContext)
    }
    return image

erica

import UIKit

/// High precedence
precedencegroup HighPrecedence { higherThan: BitwiseShiftPrecedence }

/// Exponentiation operator
infix operator **: HighPrecedence

extension CGFloat {
    /// Returns base ^^ exp

erica

import Glibc

// Swift 3 version here: https://gist.github.com/erica/7aee99db9753a1636e0fbed8d68b5845

/*
   Did a bunch of tweaks this morning: 
      removed == true (sorry Kametrixom!)
      cleaned up both stringFromBytes and bytesFromString
      changed fperror check to guard
      replaced use of 1024 in several places with a single constant

erica

import Cocoa
import CoreBluetooth
import PlaygroundSupport

public class BTHelper: NSObject, CBCentralManagerDelegate, CBPeripheralDelegate {
    
    // BLE Access
    var centralManager: CBCentralManager
    override init() {
        self.centralManager = CBCentralManager(delegate: nil, queue: nil)

erica

extension Never {
  /// A developer facing statement explaining how program correctness has failed.
  public struct Reason: CustomStringConvertible {
    public let description: String
    public init(_ rationale: String) {
      self.description = rationale
    }
  }
}

erica

"JUST BECAUSE YOU'RE USING SWIFT DOESN'T MEAN YOUR QUESTION IS ABOUT SWIFT"

How To Get Answers

Ask your question and then be patient. Tell us what you want to happen, what is actually happening, and include any error messages you find:

• Provide a scenario. "I am trying to do X, I do so by calling APIs W and Y, but Z happens instead. I see the following error messages:..."
• Focus on the goal. Ask about what you're trying to achieve (the big story) rather than the specific technical detail that you believe is holding you back.
• Don't solicit help. Don't say, "Does anyone here know about (for example) Protocol Extensions". Just ask your question.
• Do your homework. Search the web before asking in-channel.
• Be courteous Don't just paste Stack Overflow questions in-channel.
• Remember the topic Refer questions about third party libraries to their developers.

erica

Introducing Role Keywords to Protocol Implementations to Reduce Code Errors

• Proposal: SE-TBD
• Author(s): Olivier Halligon, Caleb Davenport, Brian King, Erica Sadun
• Status: tbd
• Review manager: tbd

Introduction

This proposal eliminates several categories of user errors. It mitigates subtle, hard-to-find bugs in Swift protocol code that compile without warning. Introducing "role" keywords that document code intent will increase protocol safety and enable the compiler to test for issues by matching desired behaviors against actual code.

erica

import Foundation

// 3456789012345678901234567890123456789012345678901234567890123456789012345678

/*
 
 Monoid reduction, for strictly binary operation combination.
 
 Note: The monoid approach does not throw right now.
 

erica

Reducing a sequence onto its own elements

• Proposal: SE-nnnnnnnn
• Authors: Erica Sadun, Nate Cook
• Review Manager: TBD
• Status: Awaiting implementation