k1
, k2
, k3
and k4
.Return null
if no such a value.
# Return the value associated to the keys `k1`, `k2`, `k3` and `k4`.
# Return `null` if no such a value.
fun [](k1: K1, k2: K2, k3: K3, k4: K4): nullable V
do
var level1 = self.level1
var level2 = level1.get_or_null(k1)
if level2 == null then return null
return level2[k2, k3, k4]
end
lib/more_collections/more_collections.nit:260,2--268,4