Using Hashes in Ruby

Using Hashes 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.

	Total Months via hashes: 8
	#{numbers["two"]}
	zero
	5

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	#Playin with Hashes..:)
	#--------------------------------------------------------------------------------------------------------------------------------
	months = Hash.new
	months["january"] = 1
	months["july"] = 7
	total_months = months["january"] + months["july"]
	puts("Total Months via hashes: #{total_months} ")
	puts "#{months["june"]}"
	#note how a value of null is assigned to a hash of months .. as it was defined with no default initial value
	#--------------------------------------------------------------------------------------------------------------------------------
	#also check how puts is working without the use of parentheses..
	numbers = Hash.new{"zero"}
	puts '#{numbers["two"]}' # givin it this way won't work.. need to use double quotes...
	puts "#{numbers["two"]}"
	#--------------------------------------------------------------------------------------------------------------------------------
	# usage of hash literals... as key value pairs.. Here we are using symbols.. but even quotes can be used.. as shown above..
	week = Hash.new
	week = { :sunday => 1, :monday => 2, :"tuesday" => 3, :wednesday => 4, :thursday => 5, :'fri day' => 6, :saturday => 7 }
	puts "#{week[:thursday]}"

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