keymastervn

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

keymastervn

#fullstaq-ruby enables malloc-trim and jemalloc which is said to save up to 50% memory consumption
#ARG RUBY_VERSION=2.6.6-jemalloc
#FROM quay.io/evl.ms/fullstaq-ruby:${RUBY_VERSION}-slim

FROM swipesense/ruby-jemalloc:2.6-buster-slim
ENV LANG C.UTF-8
ENV DEBIAN_FRONTEND noninteractive

# Specify JP mirror, other mirrors are less stable than JP's
RUN echo 'deb http://ftp.jp.debian.org/debian/ buster main contrib non-free' > /etc/apt/sources.list

keymastervn

$ heroku login

# remember heroku instance is wellplayed with platform below
$ bundle lock --add-platform x86_64-linux --add-platform ruby

# remember postgres is wellplayed too
$ rails new app --database=postgresql

Assume you push already

keymastervn

## Installing the NodeSource Node.js 10.x repo...


## Populating apt-get cache...

+ apt-get update
Hit:1 http://deb.debian.org/debian buster InRelease
Hit:2 http://security.debian.org/debian-security buster/updates InRelease
Hit:3 http://deb.debian.org/debian buster-updates InRelease
Ign:4 https://dl.bintray.com/fullstaq/fullstaq-ruby-apt debian-10 InRelease

keymastervn

# frozen_string_literal: true

# rubocop:disable

require 'json'
require 'pry'
require 'pry-byebug'

# NOTE: going to logdna and download the jsonl and parse

keymastervn

require "benchmark/memory"
require "benchmark/ips"

def option_hash(options = {}); end
def double_splat(**options); end

Benchmark.memory do |x|
  x.report("mem option_hash") { option_hash(foo: 1, bar: 2) }
  x.report("mem double_splat") { double_splat(foo: 1, bar: 2) }
  # x.compare!

keymastervn

require 'memory_profiler'
require 'benchmark/ips'

puts "Memory stats for requiring mini_mime"
result = MemoryProfiler.report do
  require 'mini_mime'
end
puts "Total allocated: #{result.total_allocated_memsize} bytes (#{result.total_allocated} objects)"

puts "Memory stats for requiring marcel"

keymastervn

➜  xxx git:(----) ✗ bundle exec derailed bundle:mem CUT_OFF=0.3
/Users/datle-eh/.rbenv/versions/2.6.6/lib/ruby/gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/core_ext/object/duplicable.rb:111: warning: BigDecimal.new is deprecated; use BigDecimal() method instead.
TOP: 164.4844 MiB
  filestack: 55.8359 MiB
    filestack/models/filelink: 55.793 MiB (Also required by: filestack/models/filestack_av)
      filestack/utils/utils: 53.9414 MiB (Also required by: filestack/models/filestack_av, filestack/mixins/filestack_common, and 3 others)
        mimemagic: 50.7422 MiB (Also required by: filestack/utils/multipart_upload_utils, filestack/mixins/filestack_common)
        typhoeus: 3.0938 MiB (Also required by: filestack/utils/multipart_upload_utils)
          typhoeus/hydra: 2.6211 MiB
            typhoeus/hydra/block_connection: 2.5039 MiB

keymastervn

require 'benchmark/ips'

def very_good_content
  1+2+3+4+5
end

Benchmark.ips do |x|
  x.report("string") { send :very_good_content }
  x.report("symbol") { send 'very_good_content' }
  x.report("string.to_sym") { send 'very_good_content'.to_sym }

keymastervn

# This file extends the Kernel's require function and adds the 
# AutoReload module which allows to reload files once they have changed
# on the disk.
#
# Basically, you just require your files as usual, and if you want to update
# the files, either call AutoReload.reload(file) or AutoReload.reload_all.
#
# Usage:
#   irb -rautoload
#