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Use var in struct in Swift

TL;DR: Use var for properties in struct as long as it serves as a nominal tuple. In most cases, there is no obvious benefit to using let for struct properties.

Simple Example

Let's start with a simple example:

struct MyStruct {

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#!/usr/bin/env xcrun swift

import Foundation
import MetalPerformanceShaders
import MetalPerformanceShadersGraph

let device = MTLCreateSystemDefaultDevice()!

//let size = 256 * 256 - 1 // This size should work
let size = 256 * 256 // This size may not work

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#!/usr/bin/env ruby

require 'optparse'
require 'pathname'

def update_name(name, options)
  pattern = /#{options[:rpath]}/
  if name =~ pattern
    suffix = $'
    if options[:path].join(suffix).exist?

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The Hunt for the iOS 18 Neural Engine Bug: A Long Weekend Investigation

This is the tale of a long weekend spent uncovering a mysterious iOS 18 Neural Engine bug—a journey of problem-solving in a system where full visibility is elusive, especially in the locked-down world of Apple’s platforms. But the process I followed is a general approach you can use for any opaque system. It all began last week when I stumbled upon a strange behavior in my iOS app. The output generated from a CoreML model was completely broken—something I had never seen before. And after some digging, I realized this only happened when the model was running on the Neural Engine of iOS 18. The first step was triage. I implemented a quick workaround in the app: if the device is running iOS 18, switch from the Neural Engine to the GPU. This temporarily solved the issue, but I had no idea why it worked or whether other CoreML models in the app’s pipeline might also be affected. Without a deeper understanding of the root cause, I knew I cou

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/*
Copyright (c) 2024 Yoshimasa Niwa

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

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commit 6ac1a2feb7143a8bc0e57af5c8dc57cbbb05d85f
Author: Yoshimasa Niwa <[email protected]>
Date:   Fri Apr 19 22:14:55 2024 -0700

    wip

diff --git a/3_bidirectional_cxx_interop/include/fibonacci/fibonacci.h b/3_bidirectional_cxx_interop/include/fibonacci/fibonacci.h
index 911e7d7..ed3f909 100644
--- a/3_bidirectional_cxx_interop/include/fibonacci/fibonacci.h
+++ b/3_bidirectional_cxx_interop/include/fibonacci/fibonacci.h

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import AppKit
import Foundation

final class MainView: NSView {
    private let textView: NSTextView

    override init(frame frameRect: NSRect) {
        textView = NSTextView(usingTextLayoutManager: true)

        super.init(frame: frameRect)

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# Usage
# =====
#
# ## Prerequisite
#
# Prepare Python 3, for exmaple, install Homebrew and `brew install python`.
#
# ## Install dependencies
# 
# $ python3 -m venv .venv

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import Foundation

extension String: Error {}

// MARK: - Parser Combinator

typealias ParserFunction<Element, Output> =
    (any Collection<Element>) throws -> (Output, any Collection<Element>)

protocol Parser<Element, Output> {

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import Foundation

extension String: Error {}

// MARK: - Evaluation

enum Atom {
    case symbol(String)
    case number(Double)
}