Iterators in ruby

Using Iterators in Ruby - Source for the tutorial is Ruby Programming Language by Yukihiro Matsumoto(creator of Ruby) and David Flanagan.

The blog below has a sample code with output. The sample code below with inline comments in a way summarizes the concept(refer blog title) covered as part of the book.

	# working with iterators
	3.times { puts "thank you!" }
	puts("\n")
	data = [1,2,3,4,5]
	data.each {|x| puts x} # note how x although its not being declared or defined.. works for each element of the array data..
	puts("\n")
	[1,2,3,4,5].map { |x| puts x*x }
	# see the beauty of iterators in Ruby in terms of how the factorial is implemented...
	print("Enter the number whose factorial you want to find out: ")
	n = gets.to_i
	$factorial = 1
	2.upto(n) { |x| $factorial *= x }
	puts("Factorial of #{n} is:- #{$factorial} ")

view raw iterators.rb hosted with ❤ by GitHub

	thank you!
	thank you!
	thank you!
	1
	2
	3
	4
	5
	1
	4
	9
	16
	25
	Enter the number whose factorial you want to find out: 4
	Factorial of 4 is:- 24

view raw iterators_output hosted with ❤ by GitHub