Loops in Ruby

Using Loops 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.

	# loops in Ruby
	# While
	x = 10
	while x >= 0 do
	puts x
	x = x - 1
	end
	#--------------------------------------------------------------------------------------------------------------------------------
	puts("\n")
	# Until
	x = 0
	until x > 10 do
	puts x
	x = x + 1
	end
	#--------------------------------------------------------------------------------------------------------------------------------
	puts("\n")
	# While as a modifier
	x = 5
	puts x = x + 1 while x < 10
	#--------------------------------------------------------------------------------------------------------------------------------
	puts("\n")
	# Until as a modifier
	a = [1,2,3]
	puts a.pop until a.empty? # behaves like a stack.. the op is in LIFO manner
	#--------------------------------------------------------------------------------------------------------------------------------
	#for loop implementation..
	puts("\n")
	array = [ 1, 2, 3, 4, 5 ]
	for element in array # note the use of built in keywords like element simplifies our usage..
	puts element # making ruby more simpler to use
	end
	puts("\n")
	hash = { :a => 1, :b => 2, :c => 3 } # here key and value are built in keywords wrt hashes in Ruby..
	for key,value in hash
	puts "#{key} => #{value}"
	end
	#--------------------------------------------------------------------------------------------------------------------------------

view raw loops.rb hosted with ❤ by GitHub

	10
	9
	8
	7
	6
	5
	4
	3
	2
	1
	0
	0
	1
	2
	3
	4
	5
	6
	7
	8
	9
	10
	6
	7
	8
	9
	10
	3
	2
	1
	1
	2
	3
	4
	5
	a => 1
	b => 2
	c => 3

view raw loops_output hosted with ❤ by GitHub