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Ruby Conditionals


In the last article I left you with a cliffhanger; if you are here, then it worked. We previously discussed ranges and variables, and now we are going to speak about conditionals. But first, let's touch on ranges a bit more.

Author Info:
By: James Payne
Rating: 5 stars5 stars5 stars5 stars5 stars / 9
October 17, 2007
TABLE OF CONTENTS:
  1. · Ruby Conditionals
  2. · IF Statements
  3. · Else Clause
  4. · Unless Statements

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Ruby Conditionals - IF Statements
(Page 2 of 4 )

As a nerdy kid, my friend and I would make Qbasic programs whose sole purpose was to insult people. This was back before people even knew what a computer was (I'm talking an old Apple IIe and no user interface). We would program little IF Statements that would ask your name, and if you entered a certain name, it would tell you you had some serious weight issues, or that your mama was so dumb, she threw a rock at the ground and missed it. Insult gold is what I'm telling you. And all thanks to the good old If Statement.

Try the following code:


hammer_time = 2


if hammer_time > 1 && hammer_time < 3 # begins IF conditional

puts “Hammer Time!” # tells it what to do if the condition is met

end # ends the conditional

If you run this program, you will clearly see that it is indeed, Hammer Time.

In the above code, we are saying that if the variable hammer_time is greater than 1 AND less than three, print the words, “Hammer Time!” to the screen. We give the clause AND by using the && operator.

We could also use the OR (||) operator to specify that we want the value to equal this OR that. Like so:


hammer_time = 2


if hammer_time >1 || hammer_time < 3

puts “Hammer Time!”

end

Again, since hammer_time meets the criteria, “Hammer Time!” is written to the screen.

We could have made it even simpler had we wanted:


hammer_time = 2


if hammer_time > 1

puts “Hammer Time!”

end

All of the above code is an example of a Boolean condition. Boolean refers to a true/false situation (or Yes/No or On/Off). In other words, it's not like those multiple choice questions you got on your test.


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