--- Rob Dixon <[EMAIL PROTECTED]> wrote:
> Bob Showalter wrote:
> > Ravi Malghan wrote:
> > > Hi: I have this statement which checks for existence
> > > of the $VAL variable and performs certain actions
> > >
> > > if($VAL){
> > > $VAL = "$VAL:$expr"; }
> > > else {
> > > $VAL = "$expr"; }
> > >
> > > Can this 4 line statement be reduced to a single line using "?"
> > > operator?
> >
> > $VAL = $VAL ? "$VAL:$expr" : $expr;
>
> At last! Thanks Bob, this /is/ how to use the conditional operator,
> while
>
> $VAL ? ( $VAL = "$VAL:$expr" ) : ( $VAL = $expr )
>
> /isn't/. ?: is an /operator/. It happens to have three operands
> instead of the usual two or 1, but it is meant for deriving a
> new value from three others, like a function.
>
> sub conditional {
> my ($test, $val1, $val2);
> return $val1 if $test;
> return $val2;
> }
>
> $VAL = conditional ($VAL, "$VAL:$expr", $expr)
>
> Rob
If you ask /me/ the above code is a lot harder to read to the simple one-line
ternary as was mentioned before (expr:true?false).
The ternary operation is used to make your code more concise and readable,
but in a limited context. IE, you can nest ternary operations ... have fun
maintaining it!
-JW
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