naholyr

import * as React from 'react';

// TODO inject counters

const Counter = () => {
  const [value, setValue] = React.useState(1);
  const incr = React.useCallback(() => setValue(value + 1), [value]);
  return (
    <button type="button" onClick={incr}>
      Click to incr. ({value})

naholyr

const { promisify } = require('util')
const delay = promisify(setTimeout)
const pad = (s, len = 4) => s.length >= len ? s : pad(`0${s}`, len)

// 300 tasks (id for log, run for action)
const tasks = []
for (let i = 0; i < 300; i++) {
  const id = String(i)
  const run = () => delay(2000 + Math.random() * 8000)
  tasks.push({ id, run })

naholyr

import React, { Fragment, Component } from 'react';
import ReactDOM from 'react-dom';



class ContextData {
  watchers = []

  constructor(initialState = {}) {
    this.state = initialState

naholyr

scan-dependencies

Usage : node scan-dependencies.js <path>

• will find every root project inside <path> (a project is a folder with package.json file, himself not inside a node_modules directory)
• will npm install then npm outdated from project
• will list all *.js files and check for missing require(…) for every dependency

naholyr

Shitty code, version 1:

const concat = s => s.reduce((r,s) => r + s)
const mult = (a, b) => a * b
const foo = a => b => c => concat([c, ' = ', mult(a, b)])
const bar = a => Number(a) + 1
const baz = b => b ? 42 : 33
const res = foo(1)('bar')('baz')
console.log(res)

naholyr

// ( T1 => Promise<T2> ) => Array<T1> => Promise<Array<T2>>

export const concurrent = foo => vals =>
  Promise.all(vals.map(foo))

export const series = foo => vals =>
  vals.reduce((p, val) => p.then(rs => foo(val).then(r => rs.concat([val]))), Promise.resolve([]))

// Usage: promiseOfValues.then(promiseAll.concurrent(functionReturningAPromiseFromAValue))

naholyr

"use strict";

const { readFileSync } = require("fs")
const { parse } = require("json5")
const { merge } = require("lodash")

module.exports = merge({},
  // Global defaults
  requireConfig("defaults"),
  // Environment defaults

naholyr

#!/bin/bash

# Run from your project's root
# Run "npm install" or "npm update" before
# Requirement: jq (https://stedolan.github.io/jq/)

required () {
	grep -R "from ['\"]${1}[\\/'\"]\|require(['\"]${1}[\\/'\"]" --exclude-dir=node_modules --include='*.js' > /dev/null
}

naholyr

# Requires zsh
# Requires xdotool

the_command="?????"

preexec()
{
  if [ "x$TTY" != "x" ]; then
    the_command="$2"
  fi

naholyr

import config from '…'
import Redis from 'ioredis'

const client = new Redis(config.redis)
const cachePrefix = config.cache.prefix
const cacheDefaultTTL = config.cache.defaultTTL

// (string) => Promise<any>
export function get (key /* string */) {
  return client.get(cachePrefix + key)