iterators.rb

musicians = ['David Gilmour', 'Roger Waters', 'Richard Wright', 'Nick Mason']
# EACH
musicians.each do |musician|
  puts "Hello #{musician}"
end

puts '-------------'

# EACH WITH INDEX
# musicians.each do |musician|
#   puts "#{musicians.index(musician) + 1} - #{musician}"
# end
musicians.each_with_index do |musician, index|
  puts "#{index + 1} - #{musician}"
end

puts '------------------------'
# MAP
# upcased_musicians = []
# musicians.each do |musician|
#   upcased_musicians << musician.upcase
# end
# p upcased_musicians
upcased_musicians = musicians.map do |musician|
  musician.upcase
end
puts '-------------'
p upcased_musicians
first_names = musicians.map do |musician|
  musician.split.first
end
p first_names
puts '-------------'
# COUNT
# counter = 0
# musicians.each do |musician|
#   if musician[0] == 'R'
#     counter += 1
#   end
# end
# puts counter
counter = musicians.count do |musician|
  musician[0] == 'R'
end
puts counter
puts '------------'
# SELECT
# r_musicians = []
# musicians.each do |musician|
#   if musician[0] == 'R'
#     r_musicians << musician
#   end
# end
# p r_musicians
r_musicians = musicians.select do |musician|
  musician[0] == 'R'
end
p r_musicians