Re^4: Shortcut operator for $a->{'b'}=$b if $b;

[Roy Johnson]

in reply to Re^3: Shortcut operator for $a->{'b'}=$b if $b;
in thread Shortcut operator for $a->{'b'}=$b if $b;

You should re-read the OP's post. It says "The point is to have no key 'b' exist if $b is false."