yanmhlv

#Newbie programmer
def factorial(x):
    if x == 0:
        return 1
    else:
        return x * factorial(x - 1)
print factorial(6)


#First year programmer, studied Pascal

yanmhlv

# Elixir + Phoenix Framework 1.3 + Guardian + JWT(Refresh, Revoke, Recover) + Comeonin

### User model bootstrap
Let's generate User model and controller.

```bash
mix ecto.create # create DB table
mix phx.gen.json Accounts User users email:string password_hash:string # scaffold users structure
```

yanmhlv

--- PSQL queries which also duplicated from https://github.com/anvk/AwesomePSQLList/blob/master/README.md
--- some of them taken from https://www.slideshare.net/alexeylesovsky/deep-dive-into-postgresql-statistics-54594192

-- I'm not an expert in PSQL. Just a developer who is trying to accumulate useful stat queries which could potentially explain problems in your Postgres DB.

------------
-- Basics --
------------

-- Get indexes of tables

yanmhlv

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

yanmhlv

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

yanmhlv

package main

import (
	"compress/gzip"
	"io"
	"net/http"
	"strings"
)

type gzipResponseWriter struct {

yanmhlv

#!/bin/bash
#####################################################
# Name: Bash CheatSheet for Mac OSX
# 
# A little overlook of the Bash basics
#
# Usage:
#
# Author: J. Le Coupanec
# Date: 2014/11/04

yanmhlv

#!/usr/bin/env bash

if [ ! -f /tmp/linux ]; then
    curl -sS https://www.linux.org.ru/ | egrep -o /tag/[0-9a-z-]+ | sed 's|/tag/||' > /tmp/linux
fi
if [ ! -f /tmp/pron ]; then
    curl -sS http://www.xvideos.com/tags  | egrep -o /tags/[a-z0-9-]+ | sed 's|/tags/||' > /tmp/pron
fi

yanmhlv

- Haskell Mergesort
- Copyright (C) 2014 by Kendall Stewart


First we define a couple of helper functions that
will be useful in splitting the list in half:

> fsthalf :: [a] -> [a]
> fsthalf xs = take (length xs `div` 2) xs

yanmhlv

What is sync.Pool in golang and How to use it

sync.Pool (1/2)

Many Go libraries include custom thread-safe free lists, like this:

var objPool = make(chan *Object, 10)

func obj() *Object {

select {