01_sum_array.rb

# Write a method that takes in an array of numbers as input, and returns the sum of the array.

# I have written tests for you, which should all output true once you're written your code.

def sum_array(array_num)

end

p sum_array([])==0
p sum_array([1])==1
p sum_array([1,2,3,4,5])==15