yannxou

// Perform various asynchronous tasks and wait for all results

__block NSObject *result1;
__block NSObject *result2;
__block NSObject *result3;

dispatch_group_t dispatchGroup = dispatch_group_create();

dispatch_group_enter(dispatchGroup);
[self performBackgroundTask:^(NSObject *result) {

yannxou

extension Optional where Wrapped == String {
    var isNilOrEmpty: Bool {
        return (self ?? "").isEmpty
    }
}

yannxou

// Xcode will notify in the appropiate line when the custom assertion function fails

func assertSomething(with param: InterestingObject, file: StaticString = #file, line: UInt = #line) {
    XCTFail("Bad bad", file: file, line: line)
}

yannxou

func description(for percentage: Int?) -> String {
  switch percentage {
  case .some(0):
      return "Minimum value"
  case .some(let value):
      return "Value: \(value)"
  case .none:
      return "Value not specified"
  }
}

yannxou

parse_git_branch() {
     git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'
}

# Appearance

# PS1="\h:\W \u\$"  # default
export PS1="\u@\h \[\033[32m\]\W\[\033[33m\]\$(parse_git_branch)\[\033[00m\] $ "
export CLICOLOR=1
export LSCOLORS=ExFxBxDxCxegedabagacad

yannxou

import Foundation
import UIKit

func swiftVersion() -> String {
    #if swift(>=4.2.1)
    return "4.2.1"
    #elseif swift(>=4.2)
    return "4.2"
    #elseif swift(>=4.1)
    return "4.1"

yannxou

let array: [Any] = ["String1", 2, "String2", 3, 4]

for case let str as String in array {
    print(str)
}

yannxou

# Reset last commit (if changes have not been pushed yet)
git reset --soft HEAD~1

yannxou

struct Data {
    let name: String?
    let location: String?

    var components: String {
        return [name, location]
            .compactMap { $0 }
            .filter { !$0.isEmpty }
            .joined(separator: " - ")
    }

yannxou

switch john.residence?.numberOfRooms {
case .Some(let x) where x % 2 == 0:
    println("Even number of rooms")
default:
    println("Odd number of rooms")
}