kapillamba4

#include <iostream>
#include <cmath>
#include <algorithm>
#include <limits>
#include <vector>
#include <bitset>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <time.h>

kapillamba4

/* global window */

const popup = (url) => {
  const windowArea = {
    width: Math.floor(window.outerWidth * 0.8),
    height: Math.floor(window.outerHeight * 0.5),
  };

  if (windowArea.width < 1000) { windowArea.width = 1000; }
  if (windowArea.height < 630) { windowArea.height = 630; }

kapillamba4

{
  // http://eslint.org/docs/rules/

  "env": {
    "browser": true,      // browser global variables.
    "node": false,        // Node.js global variables and Node.js-specific rules.
    "worker": false,      // web workers global variables.
    "amd": false,         // defines require() and define() as global variables as per the amd spec.
    "mocha": false,       // adds all of the Mocha testing global variables.
    "jasmine": false,     // adds all of the Jasmine testing global variables for version 1.3 and 2.0.

kapillamba4

Docker - How to cleanup (unused) resources

Cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

kapillamba4

#!/bin/sh
# Cleanup docker files: untagged containers and images.
#
# Use `docker-cleanup -n` for a dry run to see what would be deleted.

exited_containers() {
  docker ps -a -q -f status=exited
}

untagged_containers() {

kapillamba4

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

const Article = require('../../../../app/models/article');

Those suck for maintenance and they're ugly.

Possible solutions

kapillamba4

ffmpeg -re -f concat -i <(for i in {1..9999}; do printf "file '%s'\n" input.mp4; done) -f v4l2 /dev/video1 && !!

kapillamba4

Table of contents

1. Алгоритм Ахо-Корасик
2. Поиск в ширину (BFS)
3. Поиск в ширину по сетке
4. Длинная арифметика
5. Бинарный поиск
6. Битовые операции
7. Битовые множества (bitset)
8. Алгоритм Блоссома

kapillamba4

const waitFor = (ms) => new Promise(r => setTimeout(r, ms))
const asyncForEach = (array, callback) => {
  for (let index = 0; index < array.length; index++) {
    await callback(array[index], index, array)
  }
}

const start = async () => {
  await asyncForEach([1, 2, 3], async (num) => {
    await waitFor(50)

kapillamba4

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)