Aleksey Ivanov ivanovaleksey

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Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

Stores data elements based on an sequential, most commonly 0 based, index.
Based on tuples from set theory.

OUT: Join

{request: "join", room: 1234, ptype: "publisher", display: "a"}

Создается participant (с типом publisher) и добавляется в комнату.

g_hash_table_insert(videoroom->participants, janus_uint64_dup(publisher->user_id), publisher);

	module DateScopes
	extend ActiveSupport::Concern

	module ClassMethods

	def define_date_scopes(*scope_columns)
	scope_columns.map(&:to_s).each do \|column\|
	match_data = column.match(/^(.*)_at$/)
	name = match_data ? match_data[1] : column

	load 'deploy'
	# Uncomment if you are using Rails' asset pipeline
	load 'deploy/assets'
	load 'config/deploy' # remove this line to skip loading any of the default tasks

	// XPath CheatSheet
	// To test XPath in your Chrome Debugger: $x('/html/body')
	// http://www.jittuu.com/2012/2/14/Testing-XPath-In-Chrome/


	// 0. XPath Examples.
	// More: http://xpath.alephzarro.com/content/cheatsheet.html


	'//hr[@class="edge" and position()=1]' // every first hr of 'edge' class

	# make_dump(){
	# now=$(date +"%Y%m%d")
	# pg_dump -Fc -U deployer -w mercury_production -f ~/manual_dumps/mercury_sa_$now.dump
	# }

	_pg_restore(){
	if [[ -z $1 ]]; then
	echo Database is not specified
	return 0
	fi

	require 'axlsx'
	require 'batch_factory'

	def off_balance?(count)
	!(count =~ /^0\d\d/).nil? \|\| !(count =~ /^\D/).nil?
	end

	keys = [:code, :name, :sub1, :sub2, :sub3]

	skk = BatchFactory.from_file('skk.xlsx', keys: keys).drop(1)

	require 'dry-struct'

	module Types
	include Dry::Types.module
	end

	class Button < Dry::Struct
	attribute :text, Types::String
	end

	#!/bin/bash

	ffmpeg \
	-protocol_whitelist file,udp,rtp -i sdp.test \
	-c:v libx264 -c:a aac \
	-y test.mp4


	# ffmpeg \
	# -protocol_whitelist file,rtp,udp -i sdp.test \