blocks.rb

# YIELD


def bigcount
  (0..100000000).sort
end


def timer(callback)
  start_time = Time.now

  callback

  end_time = Time.now

  end_time - start_time
end

def timer
  start_time = Time.now

  yield if block_given?

  end_time = Time.now

  end_time - start_time
end


def greet(name)
  puts "#{yield(name)}"
end


greet("rui") { |name| "Hello, #{name.capitalize}" }
greet("rui") { |name| "Bom dia, #{name.capitalize}" }

iterators.rb

countries = ["portugal", "england", "poland", "france"]

# Enumerators

countries.each do |country|
  puts country.capitalize
end

countries.each_with_index do |country, index|
  puts "#{index + 1} - #{country.capitalize}"
end

upcased_countries = []
countries.each do |country|
  upcased_countries << country.upcase
end


# map => returns new array with same length
upcased_countries = countries.map do |country|
  country.upcase
end
p upcased_countries

# select =>
countries_with_p = countries.select do |country|
  country.upcase.start_with?("P")
end
p countries_with_p

# find => returns an element
country_with_e = countries.find do |country|
  country.downcase.start_with?("p")
end
p country_with_e


#              do                                            end
p countries.find { |country| country.downcase.start_with?("p") }


# count => returns an integer
p countries.count { |country| country.start_with?("p") }

recap.rb

range = (0..100).to_a
# p range

range_2 = (0...100).to_a
# p range_2

# Arrays

#.             0            1          2
countries = ["portugal", "england", "poland", "france"]

# Reading
# puts countries[1]

for index in (0...countries.length)
  puts countries[index]
end

for country in countries
  puts country.capitalize
end