mmyoji

import "colors";

import * as Diff from "diff";

const one = "こんにちは、きょうはいい天気ですね。";
const other = "こんばんは。今日は良い天気だね。";

const diff = Diff.diffChars(one, other);

function log(word) {

mmyoji

// https://florian.github.io/xor-trick/

function swap(a: number, b: number): [number, number] {
  a ^= b;
  b ^= a;
  a ^= b;
  return [a, b];
}

/**

mmyoji

type TaskFn<T> = () => Promise<T>;

// see: https://maximorlov.com/parallel-tasks-with-pure-javascript/
async function limit<T>(tasks: TaskFn<T>[], concurrency: number) {
  const results: (T | Error)[] = [];

  async function run(iterator: IterableIterator<[number, TaskFn<T>]>) {
    for (const [index, task] of iterator) {
      try {
        results[index] = await task();

mmyoji

# see: https://nodejs.org/api/crypto.html#cryptoscryptpassword-salt-keylen-options-callback

import { scrypt as _scrypt } from "node:crypto";
import { promisify } from "node:util";

const scrypt = promisify(_scrypt);

// e.g.) crypto.ramdomUUID().replace(/-/g, "")
const SALT = "random chars at least 16 bytes";

mmyoji

SELECT users.*, posts.*
FROM users
INNER JOIN posts ON posts.user_id = users.id;

mmyoji

preact          4.2kB (minified + gzipped)
@preact/compat  0.2kB (minified + gzipped)

react           2.5kB (minified + gzipped)
react-dom      42.0kB (minified + gzipped)

vite (react-ts):                   built index-xxx.js 143.55kB (gzip: 46.17kB)
vite (react-ts w/ @preact/compat)  built index-xxx.js  24.24kB (gzip:  9.36kB)
vite (preact-ts):                  built index-xxx.js  13.53kB (gzip:  5.48kB)

mmyoji

// Chapter 6
type NonEmptyArray<T> = [T, ...T[]];

mmyoji

// Suppose we have following code:

class APIError extends Error {}

function throwAPIError(message: string) {
  // complicated logic...

  throw new APIError(message);
}

mmyoji

# https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/distribution-web-values-specify.html#DownloadDistValuesPathPattern

# maybe settings are like the following:
- OriginSettings:
  - OriginDomain: MY-EXAMPLE-BUCKET.s3.ap-northeast-1.amazonaws.com
    OriginPath: /static
  - OriginDomain: example-load-balancer-1234567890.ap-northeast-1.alb.amazonaws.com
    OriginPath: *

mmyoji

mysql> SELECT * FROM information_schema.SCHEMATA WHERE schema_name = "test";
+--------------+-------------+----------------------------+------------------------+----------+
| CATALOG_NAME | SCHEMA_NAME | DEFAULT_CHARACTER_SET_NAME | DEFAULT_COLLATION_NAME | SQL_PATH |
+--------------+-------------+----------------------------+------------------------+----------+
| def          | test        | latin1                     | latin1_swedish_ci      | NULL     |
+--------------+-------------+----------------------------+------------------------+----------+
1 row in set (0.00 sec)

-- https://stackoverflow.com/a/6115705
mysql> ALTER DATABASE test CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;