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wantarray

Perl 5 version 12.2 documentation
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wantarray

Perl functions A-Z | Perl functions by category | The 'perlfunc' manpage
  • 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).

    1.     return unless defined wantarray; # don't bother doing more
    2.     my @a = complex_calculation();
    3.     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.