Operators in Ruby - Part 2

Using Operators in Ruby - Part 2 - 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.

	false
	true
	false
	4
	0
	3
	0
	false
	true
	true
	7
	4
	5
	6
	7
	7
	You have 2 messages
	6
	9
	7

view raw op2_output hosted with ❤ by GitHub

	# Equality operators( '==' and check this '==='( case equality operator.. do note.. ) ).
	a1 = 3
	a2 = 4
	a3 = 0
	s1 = (a1==a2)
	puts(s1)
	s2 = (a3!=a2)
	puts(s2)
	z1 = [ 4..10 ]
	puts((1..10) == 5)
	#--------------------------------------------------------------------------------------------------------------------------------
	#Boolean operators( &&, ||, ! ), new things to learn here.. do note..
	b1 = a3 && a2 # NOTE THIS!! here what happens is that the boolean && in Ruby works differently.. if the 1st operand is neither nil or false..
	puts(b1) # the value of the second operand is printed as the output.. Advtg of using this is its like a short-circuit operator..
	b2 = a3 & a1 #this is the logical AND.. do note the difference..
	puts(b2) # Advtg of using this is.. its like a short-circuit operator..
	b3 = a1 || a2 # note this too.. here.. if the 1st operand is neither a nil or false the op is the 1st operand.. else its second operand..
	puts(b3)
	b4 = 0 | a3 #this is the logical OR .. do note the difference..
	puts(b4)
	b5 = !a3 # NOTE THIS!! in Ruby 0 is not equivalent to nil or false.. as you would otherwise find in C Programming.. hence the op
	puts(b5)
	b6 = !nil
	puts(b6)
	b7 = !false
	puts(b7)
	#--------------------------------------------------------------------------------------------------------------------------------
	#cool..check this out..!! + conditional operator.. + defined?
	c = 4
	c += 3
	puts(c)
	c1,c2,c3 = 4,5,6
	puts(c1)
	puts(c2)
	puts(c3)
	c4=c5=7
	puts(c4)
	puts(c5)
	n = 2
	puts("You have #{n} #{n==1 ? 'message' : 'messages'}")
	c3>c5 ? c3=9 : c5=9 # do note if its given the way below.. there is an error.. probably as it would tkae :c5 as a symbol n not a part of the conditional op.
	#c3>c5?c3=9:c5=9
	puts(c3)
	puts(c5)
	s1 = c if defined? c # if variable is defined copy its value to s1..
	puts(s1)
	#--------------------------------------------------------------------------------------------------------------------------------

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