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dinhhuydh/ruby_exercise_2.rb

Created December 3, 2017 04:50
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ruby_exercise_2.rb
#1. sum of even numbers
# count_even(a)
# [1,2,3] => 2
# [1,2,4] => 6
# 2. Return names with 'H' at first letter
# ['Haa', 'aa', 'kkk] => ['Haa']
# 3. check if a number is prime
# prime(5) => true
# prime(4) => false
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