tkersey

const I = x => x;
const K = x => y => x;
const A = f => x => f(x);
const T = x => f => f(x);
const W = f => x => f(x)(x);
const C = f => y => x => f(x)(y);
const B = f => g => x => f(g(x));
const S = f => g => x => f(x)(g(x));
const P = f => g => x => y => f(g(x))(g(y));
const Y = f => (g => g(g))(g => f(x => g(g)(x)));

tkersey

New Build System Tricks

Command Line

# enable internal menu
defaults write com.apple.dt.Xcode ShowDVTDebugMenu -bool YES

alias xcbuild=$(xcode-select -p)/../SharedFrameworks/XCBuild.framework/Versions/A/Support/xcbuild

tkersey

Build settings reference

Active Build Action (ACTION)

A string identifying the build system action being performed.

Additional SDKs (ADDITIONAL_SDKS)

The locations of any sparse SDKs that should be layered on top of the one specified by Base SDK (SDKROOT). If more than one SDK is listed, the first one has highest precedence. Every SDK specified in this setting should be a "sparse" SDK, for example, not an SDK for an entire macOS release.

Alternate Install Group (ALTERNATE_GROUP)

tkersey

// This example shows how higher-kinded types can be emulated in Swift today.
// It acheives correct typing at the cost of some boilerplate, manual lifting and an existential representation.
// The technique below was directly inspired by the paper Lightweight Higher-Kinded Polymorphism
// by Jeremy Yallop and Leo White found at http://ocamllabs.io/higher/lightweight-higher-kinded-polymorphism.pdf

/// `ConstructorTag` represents a type constructor.
/// `Argument` represents an argument to the type constructor.
struct Apply<ConstructorTag, Argument> {
    /// An existential containing a value of `Constructor<Argument>`
    /// Where `Constructor` is the type constructor represented by `ConstructorTag`

tkersey

import Foundation
import UIKit
import PlaygroundSupport

// --------------------------------------------------------------------------------
// MARK: - operators
// --------------------------------------------------------------------------------

precedencegroup MonoidComposePrecedence {
  associativity: left higherThan: AssignmentPrecedence lowerThan: AdditionPrecedence

tkersey

Verifying my Blockstack ID is secured with the address 1Pgb6MVcG9qhJ6Tnu86FPs5MtY1znYC3wP https://explorer.blockstack.org/address/1Pgb6MVcG9qhJ6Tnu86FPs5MtY1znYC3wP

tkersey

Quick access

• Books I'm tracking

2025

July

• ICEBlock

  See something, tap something

  ICEBlock is an innovative, completely anonymous crowdsourced platform that allows users to report Immigration and Customs Enforcement (ICE) activity with just two taps on their phone. In recent years, ICE has faced criticism for alleged civil rights abuses and failures to adhere to constitutional principles and due process, making it crucial for communities to stay informed about its operations.

> Modeled after Waze but for ICE sightings, the app ensures user privacy by storing no personal data, making it impossible to trace reports back to individual users. Available exclusively for iOS devices, ICEBlock empowers communities to stay informed about ICE presence within a 5-mile radius while maintaining their anonymity through real-time updates and automatic deletion of sightings after four hours.

tkersey

extension UIView {
  func calculatePreferredHeight(preferredWidth: CGFloat? = nil) -> CGFloat {
    let width = preferredWidth ?? frame.width
    let widthConstraint = NSLayoutConstraint.constraintsWithVisualFormat("H:[view(==\(width)@999)]", options: .allZeros, metrics: nil, views: ["view": self])
    addConstraints(contraint)
    let height = systemLayoutSizeFittingSize(UILayoutFittingCompressedSize).height
    removeConstraints(constraint)
    return height
  }
}

tkersey

"fundamental constants of human-computer interaction", which can be split into the human and computer halves.

Very roughly:

~16 ms – frame budget for interactive animation
100 ms – user action feels instantaneous
200 ms – typical human reaction time
500+ ms – perceptible delay
3+ seconds – perceived sluggishness
10+ seconds – attention span is broken

tkersey

Verifying myself: My Bitcoin username is +tk. https://onename.io/tk