DmitryTsepelev

How to run examples

1. Run $ createdb uniq-db-test to create DB
2. Run example with Ruby (e.g., $ ruby 1_find_or_create_by_single_thread.rb)

Benchmark output

With many successful INSERTs

Warming up --------------------------------------

DmitryTsepelev

How to run examples:

1. Run $ createdb nplusonedb to create DB
2. Run specs $ rspec demo.rb

DmitryTsepelev

ActiveRecord::Migration.remove_foreign_key(:current_table, :foreign_table) # no lock

ActiveRecord::Migration.add_column(:current_table, :column_bigint, :bigint) # no lock

copy_data = lambda do
  CurrentTable.where(column_bigint: nil).where.not(column: nil).in_batches do |batch|
    batch.update_all("column_bigint = column")
  end
end

DmitryTsepelev

import Control.Applicative hiding (many)
import Data.Char (toLower, isAlphaNum)
import Data.Either (isRight)
import Data.List (isPrefixOf)

data Parser a = Parser { parse :: String -> Either String (String, a) }

satisfy :: (Char -> Bool) -> Parser Char
satisfy pr = Parser f where
  f "" = Left "unexpected end of input"

DmitryTsepelev

Snippets for the article about natural language programming with Ruby

DmitryTsepelev

Examples for my metaprogramming/DSL talk

DmitryTsepelev

Setup

Results gathered from my MacBook Pro Mid 2014 (2,5 GHz Quad-Core Intel Core i7, 16 GB 1600 MHz DDR3)

GraphQL Parsing

                                   user     system      total        real
1 fields, 0 nested levels:     0.000153   0.000002   0.000155 (  0.000152)
1 fields, 2 nested levels:     0.000188   0.000001   0.000189 (  0.000187)

DmitryTsepelev

class GraphqlController < ApplicationController
  include EnsureHash

  def execute
    result = GraphqlSchema.execute(
      params[:query],
      variables: ensure_hash(params[:variables]),
      context: context,
      operation_name: params[:operationName],
    )

DmitryTsepelev

How to run examples:

1. Run $ createdb railstestdb to create DB
2. Run examples with Ruby $ ruby demo.rb

DmitryTsepelev

require "bundler/inline"

gemfile do
  source "https://rubygems.org"

  gem "graphql"
end

class BaseObject < GraphQL::Schema::Object
end