apple_picker.rb

def apple_picker(array_of_fruits)
  #array_of_fruits.select { |fruit| fruit if fruit == "apple" }
  array_of_fruits.collect do |fruit|
    fruit if fruit == "apple"
  end.compact
end

p apple_picker(["apple", "orange", "apple"]) #=> ["apple", "apple"]

# select vs. collect
# if a conditional requirement is not met within a collect iteration, the value returned
# is equal to nil... in other words, select can and will return an array with fewer
# values than that of self (on which select was called)