I’ve enrolled in Dev Bootcamp to help accelerate my learning. Week 1 was all about ruby algorithms. This involved converting roman numerals to Arabic, creating chess boards, boggle and building an app that solves sudoku. After week 1 at DBC you will never look at sudoku the same way again. I forgot to mention the different search methods (dictionary, linear, binary, etc.), nested arrays, regex drills, and good ol’ ruby racer. Ruby racer was actually a lot of fun. And don’t get me started on the 7 books we had to read. spoiler alert: POODR is the most important read (Practical Object-Oriented Design in Ruby)
Ruby Racer
require_relative 'racer_utils'
class RubyRacer
attr_reader :players, :length, :die
def initialize(players, length = 30)
@players = {players[0] => 0, players[1] => 0}
@length = length
@die = Die.new
end
# Returns +true+ if one of the players has reached
# the finish line, +false+ otherwise
def finished?
players['a'] >= length || players['b'] >= length
end
# Returns the winner if there is one, +nil+ otherwise
def winner
return players.key(players['a']) if players['a'] >= length
return players.key(players['b']) if players['b'] >= length
end
# Rolls the dice and advances +player+ accordingly
def advance_player!(player)
players[player] += die.roll
players[player] = length if players[player] > length
end
# Prints the current game board
# The board should have the same dimensions each time
# and you should print over the previous board
def print_board
puts " | " * players['a'] + ' a ' + " | " * (length - players['a'])
puts " | " * players['b'] + ' b ' + " | " * (length - players['b'])
end
end
players = ['a', 'b']
game = RubyRacer.new(players)
# This clears the screen, so the fun can begin
clear_screen!
until game.finished?
players.each do |player|
# This moves the cursor back to the upper-left of the screen
move_to_home!
end
end
# The game is over, so we need to print the "winning" board
clear_screen!
move_to_home!
game.print_board
puts "Player '#{game.winner}' has won!"
die.rb
class Die
def initialize(sides = 6)
@sides = sides
end
def roll
1 + rand(@sides)
end
end
# Use "reputs" to print over a previously printed line,
# assuming the cursor is positioned appropriately.
def reputs(str = '')
puts "\e[0K" + str
end
# Clear the screen
def clear_screen!
print "\e[2J"
end
# Moves cursor to the top left of the terminal
def move_to_home!
print "\e[H"
end
# Flushes the STDOUT buffer.
# By default STDOUT is only flushed when it encounters a newline (\n) character
def flush!
$stdout.flush
end
Week 2 consists of recursion, ARGV basics, benchmarking, OOD, TDD, team projects and SQL.
Fibonacci example:
def is_fibonacci?(i, num0 = 0, num1 = 1)
if i == num0 || i == num0 + num1
return true
elsif i < num1
return false
end
is_fibonacci?(i, num1, num0 + num1)
end
week 3 is more SQL, OO, TDD. This is also the week they introduce ActiveRecord and Sinatra. Perhaps this doesn’t sound like much… but believe me it is.
What now?
So Now that I begin again tomorrow, I have the opportunity to learn it all again! Onward and upward!
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