marcric

def read_from_user_input
  puts "Please insert a year to see if it's a Leap year: "
  STDOUT.flush
  gets.chomp 
end
 
def validator(a_string)
  if(x=(a_string.scan(/\D/).size==0))
		 puts "numeric"
		 puts a_string

marcric

# scope_dbl_deny.rb

=begin
This code comes from a discussion in rails-br group.

http://groups.google.com/group/rails-br/browse_thread/thread/775784b8e759721f?hl=pt-BR

It is all about two newbie questions:

One about scope operator "::".

marcric

def safe?(col, others)
   others.each_with_index do |c, r|
      return false if col == c or (col - c).abs == (others.size - r).abs
   end
end

def solve(n, solutions = [], cols=[])
   return solutions.push(cols) unless cols.size < n
   n.times { |col| solve(n, solutions, cols + [col]) if safe?(col, cols) }
   return solutions

marcric

puts '==========='
FIXED = 'MROS'
puts FIXED
puts FIXED.object_id #=> 25986580 
puts '==========='
# after a while you may have a more flexible constant
FIXED = 'MarcRic'
# Ruby only show you a warning: already initialized constant FIXED
puts FIXED
puts FIXED.object_id #=> 25986550

marcric

puts '==========='
# Same string content - different objects
puts "ZigZag".object_id #=> 25986960 
puts '==========='
puts "ZigZag".object_id #=> 25986940
puts '==========='

marcric

:mysymbol = 'ZigZag'
# symbols03.rb:1: syntax error, unexpected '=', expecting $end :mysymbol = 'ZigZag'
#                                                                   ^

marcric

puts '==========='
puts :ZigZag.object_id #=> 199098
puts :ZigZag.object_id #=> 199098
puts '==========='
puts "ZigZag".to_sym.object_id #=> 199098
puts "ZigZag".to_sym.object_id #=> 199098
puts '==========='
puts :ZigZag == :ZigZag
# We get this true due to just one comparision
puts '==========='

marcric

:tynysymbol
$global_var = 'Zero Level'
puts :tynysymbol.object_id
class TestFirstClass
	@@class_var1 = 'First Level Class'
	def testFirstMethod
		@method_var1 = 'First Level Method'
		puts $global_var
		puts @@class_var1
		puts @method_var1

marcric

s = ['eeny','meeny','miny','moe']
puts '==========='
s.each do |v|
	myvar = v
	puts myvar
	puts myvar.object_id
end
puts '==========='
s.each do |v|
	myvar = 'Constant'

marcric

require 'benchmark'
 
string_test = Benchmark.measure do
  6_000_000.times do
    "test"
  end
end.total
 
symbol_test = Benchmark.measure do
  6_000_000.times do