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This question has been asked about PHP both here and here, and I have the same question for Perl. Given a function that returns a list, is there any way (or what is the best way) to immediately index into it without using a temporary variable?
For example:
my $comma_separated = "a,b,c";
my $a = split (/,/, $comma_separated)[0]; #not valid syntax
I see why the syntax in the second line is invalid, so I'm wondering if there's a way to get the same effect without first assigning the return value to a list and indexing from that.
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Also, first will exit the implicit loop upon finding the index that matches. The grep equivalent would be $idx = grep { $array[$_] eq 'whatever' and last } 0 ..
return() function in Perl returns Value at the end of a subroutine, block, or do function. Returned value might be scalar, array, or a hash according to the selected context.
$#array is the subscript of the last element of the array (which is one less than the length of the array, since arrays start from zero). Assigning to $#array changes the length of the array @array, hence you can destroy (or clear) all values of the array between the last element and the newly assigned position.
To access a single element of a Perl array, use ($) sign before variable name. You can assume that $ sign represents singular value and @ sign represents plural values. Variable name will be followed by square brackets with index number inside it. Indexing will start with 0 from left side and with -1 from right side.
Just use parentheses to define your list and then index it to pull your desired element(s):
my $a = (split /,/, $comma_separated)[0];
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