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hs.execute("open shortcuts://run-shortcut?name=" .. (hs.brightness.ambient() > 80 and "light" or "dark"))

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//
//  Coordinates.swift
//  Scrapyard
//
//  Created by Maciej Konieczny aka narf
//  https://vis.social/@narf/111654813643291716
//

import Foundation

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In this video I used TCP sockets. I have since switched to UDP sockets with no buffering. Results are similarly smooth but servos are more responsive.

I use the following setup:

• SparkFun ESP32 Thing
• MG92B servos
• ESP32 is an access point (creates a wifi network) and a UDP socket server
• gamepad communicates with the phone over bluetooth
• phone joins the wifi network and sends data to the UDP socket
• I need only one-way communication

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Update: You can fix Xcode 7β3 "open project crash" by opening Xcode 6, going to preferences, "Accounts" tab, and removing repositories on the left.

---

Xcode 7β3 crashes when I open a project or try to create one...

Application Specific Information:
ProductBuildVersion: 7A152u
ASSERTION FAILURE in /Library/Caches/com.apple.xbs/Sources/IDEFrameworks/IDEFrameworks-8163.8/IDEFoundation/SourceControl/Model/IDESourceControlTree.m:82

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protocol Fooable {
    var foo: String { get }
}


extension Fooable {
    var foo: String {
        return "foo"
    }
}

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Postfix ? operator in Swift

As Chris Eidhof pointed out, Swift 1.1 (available in Xcode 6.1) had postfix ? operator, which could be used to implement flatMap on optionals:

// Swift 1.1 (Xcode 6.1)

extension Optional {
    func flatMap<U>(f: T -> U?) -> U? {
 return map(f)?

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// Of course, `if let` with multiple optionals is lazy.
//
// Tested on 2015-02-09 in Xcode 6.3 Beta 1, Swift 1.2.


func foo() -> Int? {
    println("foo")
    return 0
}

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Swift job interview idea: implement Dictionary.map

https://twitter.com/narfdotpl/status/558348210079809536

First try on a piece of paper

extension Dictionary {
 func map(f: (Hmm.Key, Hmm.Value) -> (A, B)) -> [A: B] {

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def f(s):
    return '%.3f' % (int(s, 16) / 255.0)

def rgb(s):
    print '[UIColor colorWithRed:%s green:%s blue:%s alpha:1],' % \
           tuple(f(s.lstrip('#')[i : i + 2]) for i in range(0, 6, 2))

rgb('ffffff')  # [UIColor colorWithRed:1.000 green:1.000 blue:1.000 alpha:1],
rgb('ff0000')  # [UIColor colorWithRed:1.000 green:0.000 blue:0.000 alpha:1],

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let email = "hello@narf.pl"
let domain = email[find(email, "@")!.succ()..email.endIndex]  // WTF
println(domain)