yllan

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode() : val(0), next(nullptr) {}
 *     ListNode(int x) : val(x), next(nullptr) {}
 *     ListNode(int x, ListNode *next) : val(x), next(next) {}
 * };
 */

yllan

https://developer.apple.com/library/archive/documentation/mac/pdf/Text.pdf
https://developer.apple.com/library/archive/documentation/mac/pdf/MoreMacintoshToolbox.pdf
https://developer.apple.com/library/archive/documentation/mac/pdf/MacintoshToolboxEssentials.pdf
https://developer.apple.com/library/archive/documentation/mac/pdf/ResEditReference.pdf
https://developer.apple.com/library/archive/documentation/mac/pdf/ImagingWithQuickDraw.pdf
https://developer.apple.com/library/archive/documentation/mac/pdf/MacOS_RT_Architectures.pdf
https://developer.apple.com/library/archive/documentation/mac/pdf/Processes/Vertical_Retrace_Mgr.pdf
https://developer.apple.com/library/archive/documentation/mac/pdf/Sound/Sound_Input_Manager.pdf
https://developer.apple.com/library/archive/documentation/mac/pdf/Networking/DDP.pdf
https://developer.apple.com/library/archive/documentation/mac/pdf/Operating_System_Utilities/PRAM_Utilities.pdf

yllan

const IDX = {
  VHS: { P2: 6, P3: 7, P4: 8, P5: 9, P6: 10 }
}
const nudgePoints = (elementIndexes) => assign((ctx, evt) => {
  const [x, y] = [evt.clientX, evt.clientY]
  const [sx, sy] = ctx.lastClientPoint
  const [dx, dy] = [x - sx, y - sy]
  const paths = elementIndexes.map(idx => [0, ctx.groupIndex, idx])
  ctx.editorMethods.nudgeElementsAtPath(dx, dy, paths)
  return { ...ctx, lastClientPoint: [x, y] }

yllan

const pinchMachine = Machine({
  id: 'pinch',
  initial: 'idle',
  context: {
    onPinch: () => {},
    onPan: ([dx, dy]) => {},
    finishPinch: () => {},
    onSingleTouch: {
      touchStart: (currentPoint) => {},
      touchMove: (currentPoint) => {},

yllan

std::variant 是 C++ 的 sum type

在 C++17 後要 sum type 可以這樣用：

#include<variant>

// data Solution = Surface Vector3 Double |
//                 Line Vector3 Vector3 |

yllan

// Copyright (c) the JPEG XL Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,

yllan

const m = Machine({
  id: 'websocket',
  context: {
    devices: []
  },
  initial: 'offline',
  states: {
    offline: {
      on: {
        CONNECT: 'trying'

yllan

//
//  main.swift
//  ShitWeb
//
//  Created by Yung-Luen Lan on 2020/5/14.
//  Copyright © 2020 Yung-Luen Lan. All rights reserved.
//

import Foundation
import Network

yllan

yllan

前提： Syntax很簡單，不用look ahead，而且都會知道要讀多少byte（沒有那種「讀到0x00為止」）

我的作法看起來長這樣：

const msgParser = expect([10, 10, 20], (datetime, messageType, messageID) => {
    switch (messageType) {
        case "HI":
            expect([10, 10], (senderID, senderName) => {
 // connect