From: Patrick Spence <patrick@...>
Date: 2006-08-10T04:26:23+09:00
Subject: Re: how to see if a variable matches an array element?

John Fink wrote:
> Hey folks,
> 
> I'm knocking together a Rock, Paper, Scissors Ruby script to teach 
> myself
> more Ruby deliciousness, and I've got it working, except I want to 
> compare a
> variable to an array element (one of ["R", "P", "S"]) and have the 
> program
> die if it doesn't match up.
> 
> Here's the relevant part of my script (note the rochambo function is 
> defined
> earlier in the script, and is really verbose, so I clipped it out):
> 
> choices = %w{R P S}
> puts "Your choice? R,P,S"
> userchoice = gets.chomp.upcase
> computerchoice = choices[rand(choices.length)]
> puts "You picked " + userchoice + "!"
> puts "Computer picked " + computerchoice + "!"
> puts "FIGHT!"
> rochambo(userchoice, computerchoice)
> 
> 
> Basically I want to have the program die if the userchoice variable 
> doesn't
> equal one of the elements in the choices array, and it should be easy, 
> but I
> am hitting my head against a wall.
> 
> jf

irb(main):031:0> choices = %w{R P S}
=> ["R,P,S"]
irb(main):032:0> computerChoice = gets.chomp.upcase()
y
=> "Y"
irb(main):033:0> choices.include?(computerChoice)
=> false
irb(main):034:0> computerChoice = gets.chomp.upcase()
r
=> "R"
irb(main):035:0> choices.include?(computerChoice)
=> true

-- 
Posted via http://www.ruby-forum.com/.