Binding of or/and & ||/&&

Got bitten today by:

1 2 3 4 5

def call_1 ; false ; end def call_2 ; true ; end x = call_1 or call_2 # x => false

Because of binding issue of or, x is assigned to return of call_1 first, prior separated calling of call_2. Since what i actually want is to assign x to whichever valid (non nil/false) value of call_1 or call_2, i should use ||, which as a stronger binding, and code as:

1 2	x = call_1 || call_2 # x => true

The same applies for && & and.