You may as well use the standard if/else and avoid a temporary.
No temporary variable, and no if/else, replacing
EXPR1 if $x;
EXPR2 unless $x;
can be done as:
((sub {EXPR1}, sub {EXPR2})[!!$x || 0])->();
except that EXPR1 and EXPR2 in the latter have their own scopes - but you have that with an if/else construct as well.
If EXPR1 and EXPR2 are function calls using the same arguments, as in:
foo($arg, @args) if $x;
bar($arg, @args) unless $x;
one could write:
((\&foo, \&bar)[!!$x || 0])->($arg, @args)
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