kawaz

/**
 * a以上b以下の整数の乱数を生成する
 * @param {number|bigint} a 
 * @param {number|bigint} b 
 * @returns {number|bigint}
 */
function getRandomIntBetween(a, b) {
    if (b < a) {
        // [a, b] = [b, a]
        const t = a; a = b; b = t;

kawaz

#!/bin/bash
set -e
set -o pipefail

# pam_tidの存在チェック（間違えてLinux環境などで実行されたら中断する）
[[ -f /usr/lib/pam/pam_tid.so.2 ]] || exit 1
[[ "${OSTYPE:0:6}" == "darwin" ]] || exit 1

# /etc/pam.d/sudo を念のためターミナルに出力しておく（似非バックアップ）
echo "### /etc/pam.d/sudo (original)"

kawaz

const superInterval = (cb, interval=1000, ...args) => {
  try {
    const code = `self.addEventListener('message', msg=>{setInterval(()=>self.postMessage(null), msg.data)})`
    const w = new Worker(`data:text/javascript;base64,${btoa(code)}`)
    w.onmessage = () => cb(...args)
    w.postMessage(interval)
    return {stop:()=>w.terminate()}
  } catch(_){
    // 実装の問題またはCSPによる拒否などで Worker が使えなければ普通の setInterval を使う
    const id = setInterval(cb, interval, ...args)

kawaz

// タイムアウト付き setInterval
const setIntervalTimeout = (f, interval = 200, timeout = 5000, immediate = false) => {
  immediate && setTimeout(f, 0)
  const i = setInterval(f, interval)
  const t = setTimeout(() => clearInterval(i), timeout)  
  return () => { clearInterval(i); clearTimeout(t) }
}
// タイムアウト付き setInterval の強化版（タブがバックグラウンドになってもサボらない）
const setIntervalTimeoutSuper = (f, interval = 200, timeout = 5000, immediate = false) => {
  try {

kawaz

const binconv = (()=>{

// base64 <-> binary
const atob = window.atob
const btoa = window.btoa

// binary <-> Uint8Array
const btou8 = b => new Uint8Array([].map.call(b,c=>c.charCodeAt(0))) //new Uint8Array([...b].map(c=>c.charCodeAt(0)))
const u8tob = u8 => String.fromCharCode.apply(null,u8) //String.fromCharCode(...u8)
// string <-> Uint8Array

kawaz

#!/usr/bin/env bash
sudo yum groups install -y Development\ tools
sudo yum install -y cmake
sudo yum install -y python34-{devel,pip}
sudo pip-3.4 install neovim --upgrade
(
cd "$(mktemp -d)"
git clone https://github.com/neovim/neovim.git
cd neovim
make CMAKE_BUILD_TYPE=Release

kawaz

const beep = (duration=200, frequency=440, gain=1.0) => new Promise((resolve, reject) => {
  try {
    const audioCtx = new AudioContext()
    const oscNode = new OscillatorNode(audioCtx, {frequency, type:"square"})
    const gainNode = new GainNode(audioCtx, {gain})
    oscNode.onended = resolve
    oscNode.connect(gainNode).connect(audioCtx.destination)
    oscNode.start(audioCtx.currentTime)
    oscNode.stop(audioCtx.currentTime + duration / 1000)
  } catch(err){

kawaz

const movingAverageFilter = (ws=3) => {
    if(!Number.isInteger(ws) || ws < 1) {
        throw new Error(`Invalid window size. ws must be >=1. You entered: ws=${ws}.`)
    }
    let win = []
    let sum = 0
    let pos = 0
    let tail = 0
    return (head) => {
        sum = sum + head - tail

kawaz

// const q = (s,r)=>[...(r||document).querySelectorAll(s)];

const q = (selector,root) =>
  selector.split(/::shadow\s*/)
    .reduce((parents,selector,idx) =>
      parents.flatMap(parent =>
        selector=="" ? (idx==0?parent:parent.shadowRoot) : [...(idx==0?parent:parent.shadowRoot).querySelectorAll(selector)]
      )
      , [root||document]
    )

kawaz

// CloudFront Functions 内で利用可能なBASE64実装

function b64enc(b) {
    var b64codes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".split("").map(s=>s.charCodeAt(0))
    var pad = [0, 2, 1][b.length % 3]
    // 入力バイト列（本来は 0xFF を超える charCode が含まれていたらエラーにすべきだが省略
    var bCodes = (b + '\0'.repeat(pad)).split("").map(s=>s.charCodeAt(0))
    // 出力用バイト列
    var aCodes = new Uint8Array(bCodes.length / 3 * 4)
    for(var i=0,j=0; i<b.length; i+=3,j+=4){