tkersey

import Combine
import Foundation
import os

@MainActor public final class PollingDataModel<DataModels: Sendable> {
    private let logger = Logger(subsystem: "Polling", category: "PollingDataModel")

    private var pollingTask: Task<Void, Never>?
    private var currentlyPolling = false

tkersey

import Foundation

extension Task {
	static func sleep(until target: Date) async throws where Success == Never, Failure == Never {
		let duration = target.timeIntervalSinceNow
		try await Self.sleep(for: .seconds(duration))
	}
}

print("Waiting for 1s...")

tkersey

struct ReducedReplayAsyncStream<Element> {

    typealias Reduce = (_ partialResult: inout Element, _ nextResult: Element) -> Void

    private let storage: _Storage
    private var originalStream: AsyncStream<Element>

    init(
        bufferingPolicy limit: AsyncStream<Element>.Continuation.BufferingPolicy = .unbounded,
        initialResult: Element,

tkersey

extension Optional {
    func map<T>(
        transform: (Wrapped) async throws -> T
    ) async rethrows -> T? {
        guard case let .some(value) = self else { return nil }
        return try await transform(value)
    }
}

tkersey

iOS Memory Deep Dive

• vmmap --summary X.memgraph
• vmmap X.memgraph | rg "MEMORY REGION NAME"
• vmmap --verbose X.memgraph | rg "MEMORYREGION"
• leaks --traceTree 0xSTARTINGMEMORYADDRESS
• malloc_history X.memgraph --fullStacks 0xSTARTINGMEMORYADRESS
• Other helpful commands
  • vmmap --pages X.memgraph
  • leaks X.memgraph
• heap X.memgraph

tkersey

#!/bin/sh

# Runs SwiftFormat on changed Swift files in the project.
# The re-formatting may not be caught at commit time, though, and so may require a subsequent commit/amending.

# If any command fails, exit immediately with that command's exit status.
# shellcheck disable=SC3040
set -eo pipefail

# Redirect output to stderr.

tkersey

-- Yoneda --------------------------------------------------------------
newtype Yoneda f a = Yoneda { runYoneda :: forall b. ((a -> b) -> f b) } 

instance Functor (Yoneda f) where
  fmap f y = Yoneda (\ab -> runYoneda y (ab . f))
  
toYoneda :: Functor f => f a -> Yoneda f a
toYoneda fa = Yoneda (\f -> fmap f fa)

fromYoneda :: Yoneda f a -> f a

tkersey

extension LinkerSetting {
    static var mergeable: Self = unsafeFlags([
        "-Wl,-make_mergeable",
        "-Wl,-no_exported_symbols",
    ])
}

tkersey

// https://www.typescriptlang.org/play?#code/PTAEDMEMBsGcFNQAcBOB7JbYEsAu20A7UQUqIAoXATyUQBUUBXRAXlAcIGtC0B3QgbjJkQoXI0SoMWPAWKASogrVEAMRgJQrQvABu8FIOFgAItlgArdgGN8RUAEFQgCiJQAIUU1QAeRQAeOwBpXAD4NUDJQUAAfUABvUUgAcwAuUAAiaHhwXFT+UG0YJhSHAF8wiOi43ESU1JRsBIALbNz86ELXUGKDMnArG2IMrL8ggApW9rsAShTvP0CtXRQQmPDQFHhcBhRiSuq0wezA8cQusmKhXsJrWTX6pp8XUeOUl2mvXwW9QMfY1fXN7axeLJNJ1RqHPIFE6Cc49Po3eB4Bp6OauQIAYVGqzQKBmvgCwX82MIABlMrgUiNIEVJhoQuiiREiAAlO4U0AjABGL1pzHpRLe6N+fw2W2II1WTJQADoqgkNMxWOlyakyhF1QB+UBEMlZEY46XHWmS9UpFls-Uyo2rSYwoSGUDoogWK79eygQDkRK53Ig7IQACaon6sADaBJcAF1uiIAJIAWyQ0GwlkgbocAFoQm4qB540ggyFWFSaXTXAYRABRACODGwrXgV19oB8fO9OcQMfA4ALoRDeYLgX7LkCdiCUaEIgAcvAEqmbgBCOw+0CTtC4YahEYADxLrc++ntImU2BQsFwoFTuHgCfPuDQyHQ-oYlkQkBXM7nulESjhrpuUGwDJ-QAfS0BJgMva8kFwEZaRWVZLmuWxwBxHQUVHYt7Dgk1-jFCBUMWKlbVWUohAids0HAfD1kWVYRHVAA9DV7QiRC3X9NAGE5DJQJnYYRi7SkU2gaBOUgSwOEpaksNLfdeRCOSil+dVQBAE02JuHhIDwYCUJovRMKmFJ92UlS1lFQEtJ0vS0JQIjBBU2EVNwwEuxGKzcF0gi9GIiJznIpRKNADiuJ4sC6LARjmIiejsEQVd1wS4YgjI0AMnPaTCAYONOT0UIQu4+BeISEYOFLDgRg

tkersey

Array

• Two Sum
• Best Time to Buy and Sell Stock
• Contains Duplicate
• Product of Array Except Self
• Maximum Subarray
• Maximum Product Subarray
• Find Minimum in Rotated Sorted Array