Re^2: Having an expression as a hash key

In response to your solution, Japhy...I called on the help of a friend to try and help me decode it.
print $messages{$guess <=> $answer}, "\n"; that's mean there are processes, and the processes are :

1. firstly, a comparison between $guess and $answer. $answer isnt defined yet so
$answer = 0. Looking back at $guess = 0, $answer= 0, 0 <=> 0 (zero compare zero) will return 0.

2. $guess <=> $answer return 0 that's mean we we're returning '0' to $guess, then look at this $messages{$guess} alias $messages{0}.

3. what's the value of $messages{0} and we print it, "print $message{$guess} aka print $message{$guess} alias "just right"

So, is this grasping the concept behind $messages{$guess <=> $answer}? which is the part I am mostly trying to understand.

"Es gibt mehr zu Leben als Bücher, kennen Sie. Aber nicht viel mehr " -(Der Smiths)

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Re^3: Having an expression as a hash key by McDarren (Abbot) on Dec 04, 2005 at 08:39 UTC
So, is this grasping the concept behind $messages{$guess <=> $answer}? which is the part I am mostly trying to understand. hmmm.. I don't really follow your interpretation. Here is how I would explain it: Take the result of the numerical comparison between $guess and $answer, and use that as a key to the %messages hash, then return the value associated with that key. So, for example: Lets say the correct answer is 10, and the user guesses 5. Then we effectively have: `$messages{5 <=> 10}` [download] Because 5 is less than 10, `5 <=> 10` will return -1. So that becomes: `$messages{-1}` [download] So.... `print $messages{ $guess <=> $answer }, "\n";` in this instance will print "too low". Hope this helps, Darren :) PS. The spaceship operator "<=>" is generally used for sorting operations. For a good introduction to sorting, I'd thoroughly recommend this article by merlyn.	[reply] [d/l] [select]
Re^4: Having an expression as a hash key by sub_chick (Hermit) on Dec 04, 2005 at 13:35 UTC
Ahh, thank you McDarren for clearing that up. I think i can now use what japhy said and update my code. "Es gibt mehr zu Leben als Bücher, kennen Sie. Aber nicht viel mehr " -(Der Smiths)	[reply]