local empty = {
[0] = nil,
[1] = nil,
[3] = nil
}
local driver = {
[0] = "I'm the driver",
[1] = nil,
[3] = nil
}
local passenger = {
[0] = nil,
[1] = nil,
[3] = "I'm a passenger"
}
print( next(empty) )
print( next(driver) )
print( next(passenger) )
CmxvY2FsIGVtcHR5ID0gewoJIFswXSA9IG5pbCwKCSBbMV0gPSBuaWwsCgkgWzNdID0gbmlsCn0KCmxvY2FsIGRyaXZlciA9IHsKCSBbMF0gPSAiSSdtIHRoZSBkcml2ZXIiLAoJIFsxXSA9IG5pbCwKCSBbM10gPSBuaWwKfQoKbG9jYWwgcGFzc2VuZ2VyID0gewoJIFswXSA9IG5pbCwKCSBbMV0gPSBuaWwsCgkgWzNdID0gIkknbSBhIHBhc3NlbmdlciIKfQoKcHJpbnQoIG5leHQoZW1wdHkpICkKcHJpbnQoIG5leHQoZHJpdmVyKSApCnByaW50KCBuZXh0KHBhc3NlbmdlcikgKQ==