3.2.191 wantarray

wantarray

This function returns true if the context of the currently executing subroutine is looking for a list value. The function returns false if the context is looking for a scalar. Here's a typical usage, demonstrating an "unsuccessful" return:

return wantarray ? () : undef;

See also caller . This function should really have been named "wantlist", but we named it back when list contexts were still called array contexts.