My lua script is not return the result that I want

[pouralise]

value = 4>3 and false or nil
value = 4<3 and false or nil

you always get NIL because result of the first expression ([ANY] AND FALSE) is always FALSE by definition (because you have FALSE as one of the operands in AND construct)

if you want to use this construct, you can use number 0 instead of boolean value.

It's nice. thank you