=begin
This file is simply the “tangled” Ruby code of ruby-f#-demo.org;
it is the “raw” source code, provided for your convenience.
=end

x = 10
y = 5

puts x
puts y
puts x < y
puts x > y
puts x == y

x = 10
y = 5

Kernel.puts(x)
Kernel.puts(y)
Kernel.puts(x.< y)
Kernel.puts(x.> y)
Kernel.puts(x.== y)

x = 10
y = 5

Kernel.send "puts", x
Kernel.send "puts", y
Kernel.send "puts", (x.send "<", y)
Kernel.send "puts", (x.send ">", y)
Kernel.send "puts", (x.send "==", y)

x = 10000

if x > 1000 then
  puts "x is impossibly large!"
end

x = 10000

if x > 1000 then puts "x is impossibly large!" end

if x < 100000; puts "But it's not all that impossibly large..." end

x = 10000

puts "x is impossibly large!" if x > 1000

puts "But it's not all that impossibly large..." if x < 100000

has_if = true
has_elsif = true
has_else = true

if false then
  puts "Whoa, you're in trouble."
else
  if has_elsif then
    puts "Why didn't you use 'elsif' instead of 'else if' then?"
  elsif has_if and has_elsif then
    puts "Ah, I guess you had no choice then."
  end
end

lacks_unless = false

puts "No need for 'if not ...'!" unless lacks_unless

x = 0

while x <= 5 do
  puts "Counting up with while..." ++ x.to_s
  x += 1
end

until x == 0 do
  x -= 1
  puts "Counting down with until..." ++ x.to_s
end

for x in 1..5 do
  puts "Counting up with for..." ++ x.to_s
end

5.times do |x| puts "Repeating a task with times..." ++ x.to_s end

[1,2,3,4,5].each do |x|
  puts "Iterating over a list with each..." ++ x.to_s
end

f = lambda { |x, y|
  puts "Hey, how'd you call me? I'm not supposed to have a name!"
  puts "Well, anyway, take your stuff back."
  puts x
  puts y
}

g = f

f.("f's","stuff")
puts ""
g.call "g's", "things"

puts "Hello world"
puts "It's nice to meet you"

print "Whatever you do, "
print "don't squish these lines together!"

gets=78
puts "Guess my favourite number."
guess = gets
puts "How'd you know it was #{guess}?"

will = "will"
will_not = "will not"

puts "I #{will} be formatted."
puts 'I #{will_not} be formatted.'
puts "I %s also be formatted. Maybe you like my syntax more." % [will]