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forresty/count.rb

Created July 6, 2017 02:21
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count.rb
musicians = [
'Jimmy Page',
'Bieber',
'Robert Plant',
'John Paul Jones',
'John Bonham'
]
# def print_musicians(musicians)
# musicians.each do |musician|
# puts musician
# return if musician == 'Bieber'
# end
# end
# print_musicians(musicians)
# exit
num_j_musicians = musicians.count do |musician|
# puts musician[0]
musician[0] == 'J'
end
# block = proc do |musician|
# musician[0] == 'J'
# end
# num_j_musicians = musicians.count(&block)
# if nil
# this_will_not_run
# end
# puts num_j_musicians
# def hello(message)
# end
# p hello
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each.rb
musicians = [
'Jimmy Page',
'Robert Plant',
'Robert Plant',
'John Paul Jones',
'John Bonham']
# musicians.each do |musician|
# index = musicians.index(musician)
# puts "#{index + 1} - #{musician}"
# end
# (0...musicians.size).each do |index|
# puts "#{index + 1} - #{musicians[index]}"
# end
musicians.each_with_index do |musician, index|
puts "#{index + 1} - #{musician}"
end
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greet.rb
def greet(first_name, last_name)
full_name = "#{first_name.capitalize} #{last_name.upcase}"
return "Hello, #{full_name}"
end
# puts greet('john', 'lennon') # "Hello, John LENNON"
def greet2(first_name, last_name)
full_name = "#{first_name.capitalize} #{last_name.upcase}"
greeting_message = yield(full_name)
return greeting_message
end
greeting = greet2('forrest', 'ye') do |full_name|
"你好 #{full_name}"
end
puts greeting
greeting = greet2('allen', 'sanchez') do |full_name|
"hey #{full_name}"
end
puts greeting
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map.rb
musicians = [
'Jimmy Page',
'Robert Plant',
'John Paul Jones',
'John Bonham']
upcased_musicians = musicians.map do |musician|
musician.upcase
end
# p upcased_musicians
# p musicians
first_names = musicians.map do |musician|
names = musician.split(' ')
# puts "manipulating #{names}"
names.first
end
# first_names = musicians.map { |musician| musician.split(' ').first }
p first_names
# def hello
# world = 'haha'
# end
# hello
# puts world
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musicians.rb
musicians = [
'Jimmy Page',
'Robert Plant',
'Robert Plant',
'John Paul Jones',
'John Bonham'
]
for index in (0...musicians.size)
puts "#{index + 1} - #{musicians[index]}"
end
# for musician in musicians
# puts musician
# end
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select.rb
musicians = [
'Jimmy Page',
'Bieber',
'Robert Plant',
'John Paul Jones',
'John Bonham'
]
j_musicians = musicians.select do |musician|
# rand > 0.5
musician[0] == 'J'
# true
# false
# nil
end
p j_musicians
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tag.rb
tag('html') do
tag('body') do
tag('h1')
end
end
# <html><body><h1></h1></body></html>
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timer.rb
def timer
puts "starting timer"
start_time = Time.now
puts 'starting first yield'
yield
puts 'starting second yield'
yield
puts "time elapsed: #{Time.now - start_time}"
puts "done!"
end
# timer() do
# puts "doing something in the block"
# # simulate some heavy work
# sleep(3)
# puts "ending block"
# end
def n_times(n)
(0...n).each do
yield
end
end
n_times(10) do
puts "haha"
end
# 10.times do
# puts 'haha'
# end
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