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struct ContentView: View {
@State var selected: Bool = false
var body: some View {
Color.clear
.frame(width: 900, height: 400)
.toolbar {
ToolbarItem {
Button(action: {}, label: {
@dabrahams
dabrahams / FactoryInitialization.swift
Last active June 5, 2024 20:44
Class factory initializers
/// Classes whose initializers actually create derived classes
protocol FactoryInitializable {
/// The type of the least-derived class declared to be FactoryInitializable.
///
/// - Warning: Do not define this in your FactoryInitializable type!
associatedtype FactoryBase: AnyObject, FactoryInitializable = Self
// This associatedtype is a trick that captures `Self` at the point where
// `FactoryInitializable` enters a class hierarchy; in other contexts, `Self`
// refers to the most-derived type.
}
@sinclairtarget
sinclairtarget / fish.sim
Last active February 21, 2022 15:18
Simula Demonstration
Simulation Begin
! We will use this as input to Normal() below ;
Integer seed;
! Utility method for logging messages along with the current simulation
time ;
Procedure log(message); Text message; Begin
OutFix(Time, 2, 0);
OutText(": " & message);
OutImage;
(declaim (ftype (function (fixnum function) ) triples))
(time
(defun triples (n func)
(declare (optimize (speed 3) (debug 0) (safety 0)))
(declare (type function func)
(type fixnum n))
(let ((count 0))
(declare (type fixnum count))
(loop for z fixnum from 1 do
(loop for x fixnum from 1 to z do
@andrekandore
andrekandore / keypaths.playground
Created June 9, 2018 00:12 — forked from desugaring/keypaths.playground
Two-way binding in iOS using KVO
//: Playground - noun: a place where people can play
import UIKit
/* Scroll to the bottom for examples */
typealias WritableObjectKeyPath<O: NSObject, V: Equatable> = (object: O, keyPath: WritableKeyPath<O, V>)
typealias ReadOnlyObjectKeyPath<O: NSObject, V: Equatable> = (object: O, keyPath: KeyPath<O, V>)
func bind<O: NSObject, O2: NSObject, V: Equatable>(source: ReadOnlyObjectKeyPath<O, V>, to target: WritableObjectKeyPath<O2, V>) -> NSKeyValueObservation?
@desugaring
desugaring / keypaths.playground
Created June 8, 2018 15:28
Two-way binding in iOS using KVO
//: Playground - noun: a place where people can play
import UIKit
/* Scroll to the bottom for examples */
typealias WritableObjectKeyPath<O: NSObject, V: Equatable> = (object: O, keyPath: WritableKeyPath<O, V>)
typealias ReadOnlyObjectKeyPath<O: NSObject, V: Equatable> = (object: O, keyPath: KeyPath<O, V>)
func bind<O: NSObject, O2: NSObject, V: Equatable>(source: ReadOnlyObjectKeyPath<O, V>, to target: WritableObjectKeyPath<O2, V>) -> NSKeyValueObservation?
@tclementdev
tclementdev / libdispatch-efficiency-tips.md
Last active June 13, 2024 21:59
Making efficient use of the libdispatch (GCD)

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

  • You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.

  • Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

@dylanmckay
dylanmckay / facebook-contact-info-summary.rb
Last active March 12, 2024 22:46
A Ruby script for collecting phone record statistics from a Facebook user data dump
#! /usr/bin/env ruby
# NOTE: Requires Ruby 2.1 or greater.
# This script can be used to parse and dump the information from
# the 'html/contact_info.htm' file in a Facebook user data ZIP download.
#
# It prints all cell phone call + SMS message + MMS records, plus a summary of each.
#
# It also dumps all of the records into CSV files inside a 'CSV' folder, that is created
@aparrish
aparrish / understanding-word-vectors.ipynb
Last active June 16, 2024 02:26
Understanding word vectors: A tutorial for "Reading and Writing Electronic Text," a class I teach at ITP. (Python 2.7) Code examples released under CC0 https://creativecommons.org/choose/zero/, other text released under CC BY 4.0 https://creativecommons.org/licenses/by/4.0/
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