15. Now you try - this is my code

#1 



my_array = ["raindrops", :kettles, "whiskers", :mittens, :packages]

# Add your code below!

symbol_filter = lambda { |x| x.is_a? Symbol }

symbols = my_array.select(&symbol_filter)

#2

{ |my_array| my_array.is_a? Symbol}
examine this part of your code

#3

You need parentheses around your lambda - ( lambda { block } )