Its all abt hw u look at it....: Conditionals in Ruby

Tuesday, February 18, 2014

Conditionals in Ruby

Using Conditionals in Ruby - Part 1 - 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.

	# Conditionals

	a = 5
	b = 3

	# if else in operation..

	if a < b
	puts("true")
	else
	puts("false")
	end


	# if elsif else in operation..

	if a < b
	puts("a is less than b")
	elsif a == b
	puts("a is equal to b")
	else
	puts("a is greater than b")
	end


	# return value

	x = 2
	month = if x == 1 then "january"
	elsif x == 2 then "february"
	elsif x == 3 then "march"
	elsif x == 4 then "april"
	else "The Month is not either of the above four months"
	end

	puts(month)

	# a different Avatar of if.. Ruby making things simpler..

	puts x if x # if x is defined it will print the value of x.. do note..


	#--------------------------------------------------------------------------------------------------------------------------------
	# unless

	unless a == 3 # this condition is false or nil.. the actual value of a is 5.. this condition works as the opposite of the if condition..
	puts(" value of a is not 3 ")
	end


	# unless with else

	unless x == 0
	puts "x is not 0"
	else
	unless y == 0
	puts "y is not 0"
	else
	unless z == 0
	puts "z is not 0"
	else
	puts " all are zero "
	end
	end
	end
	#--------------------------------------------------------------------------------------------------------------------------------
	# case

	name = case
	when x == 1 then "one"
	when 2 == x then "two"
	when x == 3 then "three"
	when x == 4 then "four"
	when x == 5 then "five"
	else "nothing among the first five"
	end
	puts(name)

	#--------------------------------------------------------------------------------------------------------------------------------