outline.md

Interview Outline

Introduction

Code Genome

C, Java, .NET, Clojure

Setup

rails new

rvm & rbenv

Ruby

Basics

dynamic

global variables: $foo

instance/class variables syntax: @foo/@@foo

symbols

blocks: [1,2,3].each { |n| puts n }

open classes OO (easy monkey patching)

mixins

functional: lambda { |foo| foo }

rich collection support with enumerable: all?, any?, collect/map, count, detect/find, inject/reduce, max, min, select and more

args: default, hash, splat

1.8

old school but still used

1.9

big change

new syntax for chars (?a), json hashes {a: 1}

better lexical scoping, block variable must be local

enumerators: [1,2,3].each

new lambda syntax: -> foo { foo }

tap

2.0

keyword args: def foo(bar: 'baz')

refinements like scoped patching (debate, file scoped, scaled back due to perf.)

prepend: more flexible mixins

lazy: [1,2,3].lazy.cycle.map {|x| x * 10}.take(5).to_a

2.1

refinements module scoped

rational literal 0.1r

required keyword args: def foo(bar:)

faster & better GC (partial gen.)

2.2

shiny

performance

keyword args speedup

GC on symbols

unicode 7

Rails

• conventions
• MVC
• migrations
• AR

3.0

mature and modular

4.0

• strong params
• turbolinks
• russian-doll caching

4.1

• spring

• variant

  respond_to do |format| format.js { render "trash" } format.html.phone { redirect_to progress_path } format.html.none { render "trash" } end

4.2

• active job
• async mail
• adequate record (faster db queries)
• web console

5.0

Editor & IDE

editor: Emacs, vi, Sublime

IDE: RubyMine (JetBrains), RadRails (Eclipse)

Deployment

Capistrano

Outro