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REQUIREMENTS.md

BACKEND SIDE :: TECHNOLOGY :: Ruby on Rails

Provide the list or PR or other contributions that proves understanding of each subject or ask for tech interview, where we will go step by step throught the following list.

Based of the result, you will reach one of the following assesment levels:

Level Required points Testing Components Introduction
Independent ? ? ? max
Mid ? ? ? ?
Senior ? max max max

Max points: ?

Once you fill the doc, you can check your score in the browser console via the following snippet:

document.querySelectorAll("li input[checked]").length

Testing exam (run in console):

let n = 20;
let evaluationQuestions = ([]).slice.call(document.querySelectorAll("li input[checked]"))
  .map(x => ({ x, r: Math.random() }))
  .sort((a, b) => a.r - b.r)
  .map(a => a.x)
  .slice(0, n)
  .map(
    (liElement) => 
      liElement.closest('li')
        .innerHTML
        .replace('<input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> ', '')
    );
console.log(evaluationQuestions.join("\n\n"));

Curated list of learning resources can be found here

Working with GIT using CLI

  • 📗 can checkout new branch
  • can switch between branches
  • can switch between branches
  • can display and understand git log
  • can add changes (progressively, all at once, selected files)
    • can split changesets when adding changes progressively
    • can edit changesets when adding changes progressively
  • can stash and unstash changes
  • can commit changes
    • can commit changes to last commit without amending message
  • can push changes to remote branch
    • can force-push changes to remote branch
  • can delete local and remote branches
  • can merge branches using rebasing
    • can resolve conflicts using any merge-tool or manually
  • can rebase interactively (squash, fixup, reorder, rename, delete commits)
  • can cherry-pick a commit from different branch
  • can arrange a history of multiple "junk" commits mixed with "legit" commits into a commits list aggregating logical sets of changes (using any technique)

Resources

CSS & HTML Basics

  • TODO

Ruby core and std-lib

Can explain and effectively use following language features

  • Array / Enumerable
    • <<, push, pop
    • |, &, +
    • at, [], values_at
    • any?, all?, one?, none?
    • map, map!, collect, collect!
    • count, size, length
    • cycle
    • delete, delete_at, delete_if
    • drop, drop_while
    • each, each_index
    • each_cons
    • each_with_object, inject, reduce
    • empty?
    • index, find_index, rindex
    • first, second, last
    • find, detect
    • find_all, select
    • flatten, flatten!
    • flat_map
    • group_by
    • include?
    • insert
    • join
    • keep_if, select, select!
    • min, max, min_by, max_by, minmax, minmax_by
    • partition
    • reject, reject!
    • reverse, reverse!, reverse_each
    • rotate, rotate!
    • shift, unshift
    • shuffle, shuffle!
    • sort, sort!, sort_by
    • take_while
    • transpose
    • uniq, uniq!
    • zip
  • Numeric, Float
    • %, modulo
    • abs
    • ceil, floor
    • div
    • nonzero?
    • round
    • zero?
    • positive?, negative?
    • 1/0.0 vs 1/0
  • Object
    • clone, dup
    • enum_for
    • extend
    • is_a?, instance_of?, kind_of?
    • instance_variable_get, instance_variable_set, instance_variable_defined?
    • method
    • nil?
    • send, public_send
    • respond_to?
    • tap
    • method_missing
    • instance_eval, instance_exec
  • String
    • <<
    • =~
    • %
    • +, *
    • []=
    • [], slice
    • capitalize, capitalize!
    • chars
    • chop, chomp
    • count, size
    • delete
    • downcase, downcase!, upcase, upcase!
    • each_char, each_line
    • empty?
    • gsub, gsub!, sub, gsub!
    • include?
    • index
    • ljust, rjust
    • match
    • next, next!, succ, succ!
    • replace
    • reverse, reverse!
    • partition
    • scan
    • split
    • strip, strip!
    • squeeze, squeeze!
    • start_with?, end_with?
  • Operators
    • == vs ===
    • <=>
    • <, >, >=, <=
  • File
    • basename
    • delete
    • dirname
    • directory?
    • exists?
    • new
    • open
  • Class, Module
    • <
    • new, initialize
    • inherited
    • superclass
    • alias_method
    • ancestors
    • attr_reader, attr_writer, attr_accessor, attr
    • class_eval, class_exec, module_eval, module_exec
    • const_get, const_set, const_defined?
    • define_method
    • extended, included,
    • module_function
    • private, private_class_method
    • private_constant
    • name
  • Range
    • .. vs ...
    • min, max
    • cover?
    • each
  • Regexp
    • named captures
    • =~
    • match, match?
  • Hash
    • [], []=
    • dig
    • each, each_pair, each_key, each_value
    • fetch
    • has_key?, key?, has_value?
    • invert
    • key
    • keys, values
    • merge, merge!, reverse_merge, reverse_merge!
    • transform_keys, transform_keys!, transform_values, transform_values!
  • Time
    • now, utc
    • day, month, year, hour, minute, sec
    • wday
    • monday? .. sunday?
    • zone
    • strftime
    • iso8601
    • to_s(:db)
  • Difference between strings and symbols
  • Difference between local, instance and global variables
  • Difference between class (static) and instance methods
  • Procs and lambdas
  • Exceptions handling
  • Monkey-patching
  • Mixins
  • ENV
  • Enumerator
    • Enumerator::Lazy
  • NotImplementedError
  • OpenStruct
  • &.
  • Shorthand blocks syntax (&:)
  • SecureRandom

Rails

ActiveSupport

  • Core extensions
    • Array
      • deep_dup
      • extract_options
      • in_groups, in_groups_of
      • to_param, to_query
      • to_sentence
      • without
      • wrap
    • Class
      • class_attribute
      • descendants
      • subclasses
    • Date, DateAndTime
      • beginning_of_day, end_of_day
      • current, tomorrow, yesterday
      • days_ago, months_ago, years_ago
      • future?, past?, today?
      • on_weekday?, on_weekend?
      • in_time_zone
    • Enumerable
      • exclude
      • index_by
      • many?
      • pluck
      • sum
      • without
    • Hash
      • assert_valid_keys
      • compact, compact!
      • deep_dup
      • deep_merge, deep_merge!,
      • deep_stringify_keys, deep_stringify_keys!, deep_symbolize_keys, deep_symbolize_keys!
      • deep_transform_keys, deep_transform_keys!
      • except, except!, extract!
      • slice, slice!
      • with_defaults, with_defaults!
    • Kernel
      • silence_warnings
    • Module
      • alias_attribute
      • delegate
      • delegate_missing_to
      • deprecate
    • Object
      • presence, present?, presence_in
      • with_options
    • Range
      • overlaps?
    • String
  • Difference between try, try! and &.
  • ArrayInquirer
  • Benchmarkable
  • Cache
    • Available store types
    • NullStore
  • Callbacks
  • Concern
  • Configurable
  • CurrentAttributes
  • Duration
  • HashWithIndifferentAccess
  • Inflector
    • camelize
    • classify
    • constantize, safe_constantize
    • dasherize
    • deconstantize
    • demodulize
    • foreign_key
    • humanize
    • ordinalize
    • parameterize
    • pluralize, singularize
    • tableize
    • titleize
    • transliterate
    • underscore
    • upcase_first
  • MessageEncryptor
  • MessageVerifier
  • Notifications, Subscriber
  • NumberHelper
    • number_to_currency
    • number_to_delimited
    • number_to_human
    • number_to_human_size
    • number_to_percentage
    • number_to_phone
    • number_to_rounded
  • OrderedOptions
  • RangeWithFormat
  • Rescuable
  • StringInquirer

ActiveRecord

Views and Forms

ActionController

Routing

Patterns

Testing

  • TODO

Other

Gems and Libraries

Development

Testing

Tooling

  • Rubocop
  • Heroku
  • Brakeman
  • CI
  • IDE or Editor of choice
    • Quickly finding files

Open questions

  • What is your list of top things/techniques to ensure high code quality and why?
  • What do you think about metaprogramming?
  • What do you think about custom controller actions (outside CRUD)?
  • What do you consider clean code?
  • What patterns do you consider useful when writing rails apps?
  • How about testing? Are there any principles you identify with regarding TDD?
  • How would you ensure that specs are easy to understand by other developers?
  • Does writing tests after implementation affects process & quality in positive or negative way? Please explain.
  • What is your opinion about monolithic vs microservice based architecture?
  • How would you ensure reliability of microservice architecture?
  • How would you deal with performance issues in RoR?
  • What full-text search solution are you familiar with? In what cases would you use those solutions?
  • What do you miss in Rails? Where do you think RoR is not the good fit?
  • What do you like about Rails the most?
  • What is your preferred way in working with repository? (i.e. GitFlow)
  • What do you think about project documentation?
  • What are the anti-patterns when writing RoR apps in your opinion?
  • How do you deal with database related performance issues (when processing tens of millions of records)?
  • How would you deal with complex, legacy project that you need to work with, if it does not have full tests suite?
  • What options can you see in terms of static code analysis?
  • Are you familiar with concept of Test Induced Design Damage? What is your opinion on that?
  • How do you often deal with long running requests (i.e. generating documents)
  • If you are asked to implement an interface that should work with live (realtime) data feed, how would you approach implementing it?
  • How would you handle very intense traffic (i.e. from IoT) in Rails application?
  • How would you describe “maintainable code”?
  • How would you ensure stability of public API in application that is under active and rapid development?
  • If I was to write API only application in ruby, what would be your recommendations / hints in relation to this task?
  • What kinds of caching do you feel are the most useful when developing rails applications?
  • If there is an information you need deep inside your code, but it is only accessible on top level (i.e. in controller), how would you approach propagating it (think “current_user”, but it can be anything else)
  • What do you think about / where do you find application for SOA
  • What do you think about / where do you find application for JWT
  • What do you think about / where do you find application for CQRS
  • What do you think about / where do you find application for DDD
  • What do you think about / where do you find application for Reporting Databases
  • What do you think about / where do you find application for Pub / Sub
  • What do you think about / where do you find application for Event Sourcing
  • What do you think about / where do you find application for CBRA
  • What do you think about / where do you find application for UUIDs
  • What do you think about / where do you find application for WebSockets and ActionCable

Level 1

Level 2-1

Level 3-1

Level 3-2

Level 4

Level 2-2

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