morning code

block.rb

# def timer
#   start_time = Time.now
#   yield
#   puts "Elapsed time: #{Time.now - start_time}s"
# end

# # def timer2
# #   start_time = Time.now
# #   (1..8000000).to_a.each {|n|}
# #   puts "Elapsed time: #{Time.now - start_time}s"
# # end

# # result = timer do |message|
# #   puts message
# #   sleep(2)
# # end

# # puts result
# puts "how many iterations"
# count = gets.chomp.to_i

# result = timer do
#   (1..count).to_a.each {|n|}
# end

# puts result

def say_hello(first_name, last_name)
  full_name = "#{first_name} #{last_name}"
  puts yield(full_name) if block_given?
end

say_hello("Charles", "Brownson")


say_hello("Johnny", "Hallyday") do |name|
  "Hi #{name}"
end

morning.rb

musicians = ['David Gilmour', 'Roger Waters', 'Richard Wright', 'Nick Mason']

# for index in (0...musicians.length)
#   puts "#{index} - #{musicians[index]}"
# end

# for musician in musicians
#   puts musician
# end


# musicians.each_with_index do |musician, index|
#   puts "#{index} - #{musician}"
# end

# puts "=" * 20

count = 0
musicians.each do |musician|
  # count += 1
  count = count + 1
  cont + 1
  puts "#{count} - #{musician}"
end

# a = 3

musicians = ['David Gilmour', 'Roger Waters', 'Richard Wright', 'Nick Mason']

# upcased_musicians = []
# musicians.each do |musician|
#   upcased_musicians << musician.upcase
# end

# p upcased_musicians

# upcased_musicians = musicians.map do |musician|
#   musician.upcase
# end

# # strictly equivalent to
# upcased_musicians = musicians.map { |musician|  musician.upcase }

# p upcased_musicians

# filtering ===========================

# filtered_musicians = [] # contains only musicians with 1st letter is "R"
# musicians.each do |musician|

#   if musician[0] == "R"
#     filtered_musicians << musician
#   end

#   # filtered_musicians << musician  if musician[0] == "R"

# end

# p filtered_musicians

# filtered_musicians = musicians.select do |musician|
#   musician[0] == "R"
# end

# p filtered_musicians

# figures = (0..200).to_a
# even_figures = figures.select do |figure|
#   figure.even?
# end

# p even_figures

# # counting ===============================

# counter = 0
# musicians.each do |musician|
#   counter += 1 if musician[0] == "R"
# end

# p counter
counter = musicians.count do |musician|
  musician[0] == "R"
end

counter = musicians.count { |musician| musician[0] == "R" }

puts counter




def say_hi(name)
  return "Hi #{name} !!"
end

do |name|

end