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-- Perl 5.10.0 documentation --
wantarray
  • wantarray

    Returns true if the context of the currently executing subroutine or eval is looking for a list value. Returns false if the context is looking for a scalar. Returns the undefined value if the context is looking for no value (void context).

        return unless defined wantarray;	# don't bother doing more
        my @a = complex_calculation();
        return wantarray ? @a : "@a";

    wantarray()'s result is unspecified in the top level of a file, in a BEGIN , UNITCHECK , CHECK , INIT or END block, or in a DESTROY method.

    This function should have been named wantlist() instead.