jpsim

//
//  JAZMusician.h
//  JazzyApp
//

#import <Foundation/Foundation.h>

/**
 JAZMusician models, you guessed it... Jazz Musicians!
 From Ellington to Marsalis, this class has you covered.

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NSInternalInconsistencyException: Call must be made on main thread
0   CoreFoundation                	0x196c40cb4 __exceptionPreprocess + 164 (NSException.m:202)
1   libobjc.A.dylib               	0x18fcd83d0 objc_exception_throw + 60 (objc-exception.mm:356)
2   Foundation                    	0x1913ce54c -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 188 (NSException.m:242)
3   UIKitCore                     	0x1999f3da0 -[UIApplication _performBlockAfterCATransactionCommitSynchronizes:] + 404 (UIApplication.m:3377)
4   UIKitCore                     	0x199a00318 -[UIApplication _updateStateRestorationArchiveForBackgroundEvent:saveState:exitIfCouldNotRestoreState:updateSnapshot:windowScene:] + 528 (UIApplication.m:11822)
5   UIKitCore                     	0x199a005dc -[UIApplication _updateSnapshotAndStateRestorationWithAction:windowScene:] + 144 (UIApplication.m:11867)
6   <REDACTED>                          0x104bbbc04 @objc closure #1 in <REDACTED>.userNotificationCenter(_:

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When a LazyVStack is nested within a ScrollView on iOS 17, the scroll view's content offset can be incorrectly set for a brief moment, causing the scroll view to "jitter".

Here's some sample code:

import SwiftUI

struct ContentView: View {
    @State var isExpanded = Set<Int>()
    var body: some View {

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import AppKit
import Compression
import CoreImage
import Foundation
import Vision

// MARK: - Get QR code image from specified path

guard CommandLine.arguments.count == 2 else {
  print("Usage: scan-shc [path-to-qr-image]")

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This gist documents the steps to analyze the binary size allocation for SwiftLint (and other SwiftPM-based executables).

First, install Bloaty McBloatface: https://github.com/google/bloaty

Then run the following:

$ swift build -c release
$ ditto .build/release/swiftlint swiftlint-stripped
$ strip -rSTX swiftlint-stripped

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extension Array {
  func parallelMap<T>(transform: (Element) -> T) -> [T] {
    var result = ContiguousArray<T?>(repeating: nil, count: count)
    return result.withUnsafeMutableBufferPointer { buffer in
      DispatchQueue.concurrentPerform(iterations: buffer.count) { idx in
        buffer[idx] = transform(self[idx])
      }
      return buffer.map { $0! }
    }
  }

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1. Plain Strings (207): foo
2. Anchors (208): k$
3. Ranges (202): ^[a-f]*$
4. Backrefs (201): (...).*\1
5. Abba (169): ^(.(?!(ll|ss|mm|rr|tt|ff|cc|bb)))*$|^n|ef
6. A man, a plan (177): ^(.)[^p].*\1$
7. Prime (286): ^(?!(..+)\1+$)
8. Four (199): (.)(.\1){3}
9. Order (198): ^[^o].....?$
10. Triples (507): (^39|^44)|(^([0369]|([147][0369]*[258])|(([258]|[147][0369]*[147])([0369]*|[258][0369]*[147])([147]|[258][0369]*[258])))*$)

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////////////////////////////////////////////////
//
// Swift and Objective-C Class Parsing
//
////////////////////////////////////////////////

import Foundation

// Class parsing

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With the following code:

import SwiftUI

struct ContentView: View {
    @State private var showPopover = false

    var body: some View {
 NavigationView {

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An Xcode project generates the following archive:

$ tree Yams-macosx.xcarchive
Yams-macosx.xcarchive
├── Info.plist
├── Products
│   └── Library
│       └── Frameworks
│           └── Yams.framework