fdelacruz

xcode-select --install
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew update
brew cask install iterm2
# update iterm2 settings -> solarized presets
brew install git
brew cask install spectacle
brew cask install alfred
# set CMD+space to launch alfred
brew cask install firefox

fdelacruz

def proc_test
  proc = Proc.new { return }
  proc.call
  puts "Hello world"
end

proc_test  # calling proc_test prints nothing

fdelacruz

def lambda_test
  lam = lambda { return }
  lam.call
  puts "Hello world"
end

lambda_test  # calling lambda_test prints 'Hello World'

fdelacruz

proc = Proc.new { |x| puts x } # creates a proc that takes 1 argument
proc.call(2)                   # prints out 2
proc.call                      # returns nil
proc.call(1,2,3)               # prints out 1 and forgets about the extra arguments

fdelacruz

lam = lambda { |x| puts x }    # creates a lambda that takes 1 argument
lam.call(2)                    # prints out 2
lam.call                       # ArgumentError: wrong number of arguments (0 for 1)
lam.call(1,2,3)                # ArgumentError: wrong number of arguments (3 for 1)

fdelacruz

lambda { puts "Hello!" }

#Is just about the same as

Proc.new { puts "Hello!" }

fdelacruz

cube = Proc.new { |x| x ** 3 }

[1, 2, 3].collect!(&cube)    #=>[ 1, 8, 27]

[4, 5, 6].map!(&cube)       #=>[64, 125, 216]

fdelacruz

array = [1, 2, 3, 4]

array.collect! do |n|
  n ** 2
end

puts array.inspect      # => [1, 4, 9, 16]

fdelacruz

class Gear
  attr_reader :chainring, :cog, :rim, :tire
  def initialize(chainring, cog, rim, tire)
    @chainring = chainring
    @cog       = cog
    @rim       = rim
    @tire      = tire
  end

  def ratio

fdelacruz

arr = [1, 2, 3, 4]
new_arr = arr.map { |x| x * 3 }
puts new_arr.inspect                  # => [3, 6, 9, 12]