learn-co-students / advanced-hashes-hashketball-nyc-web-010620

Hasketball Review

Introductory Notes

How to participate in lecture

• Don’t wait for the answer
  • make a hypothesis based on the context and knowledge you have so far.
  • even if you don't plan on raising your hand, form a hypothesis in your head.
• Don’t be afraid to give the wrong answer.
• If you get tired or sleepy, do whatever it takes to stay awake.
  • jumping jacks
  • stand in the back
  • I don't care as long as it is not distracting others.

How to make the most of the labs

• RSPEC and TDD --f-f
• please don't just keep guessing till all the lights turn green.

SWBATS

• Identify common data types in Ruby.
• Explain what these iterators do:
  • #each
  • #select
  • #map
  • #find
• Create Methods
  • basically allow us to organize our procedures

Data Types

• Strings - some data representing text

  • to_i
  • to_f

• Integers - some data represting numbers

• Boolean - true or false

  • !!

• Arrays

  • indices
  • how to access something.

• Hash - like a dictionary, where key is the word, value is the definition.

  • keys
  • values
  • symbols

Enumerable Methods in ruby

• each
• map - put whatever the block returns in a new array
• find - return the first thing that returns true
• select - returns all the things that returned true

Methods in ruby

• Implicit return
• Explicit return
• binding.pry

def game_hash
    # returns a big hash with relavant data
end

def all_players
    game_hash[:home][:players].concat(game_hash[:home][:players])
end

def find_player(player_name)
    all_players.find { |player| player[:player_name] == player_name }
end

def num_points_scored(player_name)
    find_player(player_name)[:points]
end

We didn't have to make so many different methods, but now the code is more readable, updatable and modular because we did.

number_points_scored

• break large problems into small problems
• get quick feedback loop (code something, try it out)