Re^5: printing unitialized value of the 'do BLOCK'

Nothing ever wants the value of an if statement.

A plain if? Probably not. An if/elsif/else statement though?

my @classifications = map {
  if     ($_ > 0)  { 'positive' }
  elsif  ($_ < 0)  { 'negative' }
  else             { 'zero'     }
} @numbers;
[download]

Yes, you can write that using the ternary operator, but if/elsif/else can sometimes be clearer.

toby döt ink

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Re^6: printing unitialized value of the 'do BLOCK' by haukex (Archbishop) on Dec 17, 2019 at 21:42 UTC
Yes, this is exactly the kind of code that is the reason for my wish to have this behavior of `if` more clearly defined! Of course, `given` as a topicalizer would be even cooler, since `for ($x) { if (/a/) { "A" } ... }` doesn't work for this purpose...	[reply] [d/l] [select]
Re^6: printing unitialized value of the 'do BLOCK' by ikegami (Patriarch) on Dec 18, 2019 at 19:09 UTC
Nothing ever wants the value of an if statement, even if it has an elsif or else clause. In your example, `map` is not getting the value of the if statement --there's no such thing-- it's getting the value of the last expression evaluated.	[reply] [d/l]