Prototype loops in Io
The default nature of Io is that, if you follow the prototypes up from the Lobby, you come back to the Lobby.
I didn’t realize that, before today.
Let me summarize what the REPL shows below:
- Lobby is Object_0x7fb6e7c1e330
- Protos is Object_0x7fb6e7c1e240
- Core is Object_0x7fb6e7c1e2b0
- Object is Object_0x7fb6e7c05e30
What’s curious, and maybe it’s obvious to someone else, is why you don’t see Lobby as a slot in Object. I didn’t omit any part of its slotSummary, and Lobby just isn’t there. But you can getSlot it, anyhow. And it responds to Object Lobby. I just don’t get it.
Io> Lobby slotSummary
==> Object_0x7fb6e7c1e330:
Lobby = Object_0x7fb6e7c1e330
Protos = Object_0x7fb6e7c1e240
_ = nil
exit = method(...)
forward = method(...)
set_ = method(...)
Io> Lobby proto slotSummary
==> Object_0x7fb6e7c1e240:
Addons = Object_0x7fb6e7c1e800
Core = Object_0x7fb6e7c1e2b0
Io> Lobby proto proto slotSummary
==> Object_0x7fb6e7c1e2b0:
...
Number = 0
Object = Object_0x7fb6e7c05e30
OperatorTable = OperatorTable_0x7fb6e7e1edb0
...
false = false
nil = nil
tildeExpandsTo = method(...)
true = true
vector = method(...)
Io> Lobby proto proto proto slotSummary
==> Object_0x7fb6e7c05e30:
= Object_()
!= = Object_!=()
- = Object_-()
.. = method(arg, ...)
< = Object_<()
<= = Object_<=()
== = Object_==()
> = Object_>()
>= = Object_>=()
? = method(...)
@ = method(...)
@@ = method(...)
actorProcessQueue = method(...)
actorRun = method(...)
addTrait = method(obj, ...)
ancestorWithSlot = Object_ancestorWithSlot()
ancestors = method(a, ...)
and = method(v, ...)
appendProto = Object_appendProto()
apropos = method(keyword, ...)
argIsActivationRecord = Object_argIsActivationRecord()
argIsCall = Object_argIsCall()
asBoolean = Object_asBoolean()
asSimpleString = method(...)
asString = method(keyword, ...)
asyncSend = method(...)
become = Object_become()
block = Object_block()
break = Object_break()
clone = Object_clone()
cloneWithoutInit = Object_cloneWithoutInit()
compare = Object_compare()
contextWithSlot = Object_contextWithSlot()
continue = Object_continue()
coroDo = method(...)
coroDoLater = method(...)
coroFor = method(...)
coroWith = method(...)
currentCoro = method(...)
deprecatedWarning = method(newName, ...)
do = Object_do()
doFile = Object_doFile()
doMessage = Object_doMessage()
doRelativeFile = method(path, ...)
doString = Object_doString()
evalArg = Object_evalArg()
evalArgAndReturnNil = Object_evalArgAndReturnNil()
evalArgAndReturnSelf = Object_evalArgAndReturnSelf()
for = Object_for()
foreachSlot = method(...)
futureSend = method(...)
getLocalSlot = Object_getLocalSlot()
getSlot = Object_getSlot()
handleActorException = method(e, ...)
hasDirtySlot = Object_hasDirtySlot()
hasLocalSlot = Object_hasLocalSlot()
hasProto = Object_hasProto()
hasSlot = method(n, ...)
if = Object_if()
ifError = method(...)
ifNil = Object_thisContext()
ifNilEval = Object_thisContext()
ifNonNil = Object_evalArgAndReturnSelf()
ifNonNilEval = Object_evalArg()
in = method(aList, ...)
init = Object_init()
inlineMethod = method(...)
isActivatable = Object_isActivatable()
isError = false
isIdenticalTo = Object_isIdenticalTo()
isKindOf = method(anObject, ...)
isLaunchScript = method(...)
isNil = false
isTrue = true
justSerialized = method(stream, ...)
launchFile = method(path, args, ...)
lazySlot = method(...)
lexicalDo = Object_lexicalDo()
list = method(...)
loop = Object_loop()
markClean = Object_markClean()
memorySize = Object_memorySize()
message = Object_message()
method = Object_method()
newSlot = method(name, value, doc, ...)
not = nil
or = true
ownsSlots = Object_ownsSlots()
pause = method(...)
perform = Object_perform()
performWithArgList = Object_performWithArgList()
prependProto = Object_prependProto()
print = method(...)
println = method(...)
proto = Object_proto()
protos = Object_protos()
raiseIfError = method(...)
relativeDoFile = method(path, ...)
removeAllProtos = Object_removeAllProtos()
removeAllSlots = Object_removeAllSlots()
removeProto = Object_removeProto()
removeSlot = Object_removeSlot()
resend = method(...)
return = Object_return()
returnIfError = method(...)
returnIfNonNil = Object_returnIfNonNil()
serialized = method(stream, ...)
serializedSlots = method(stream, ...)
serializedSlotsWithNames = method(names, stream, ...)
setIsActivatable = Object_setIsActivatable()
setProto = Object_setProto()
setProtos = Object_setProtos()
setSlot = Object_setSlot()
setSlotWithType = Object_setSlotWithType()
shallowCopy = Object_shallowCopy()
slotDescriptionMap = method(...)
slotNames = Object_slotNames()
slotSummary = method(keyword, ...)
slotValues = Object_slotValues()
stopStatus = Object_stopStatus()
super = method(...)
switch = method(...)
thisContext = Object_thisContext()
thisLocalContext = Object_thisLocalContext()
thisMessage = Object_thisMessage()
try = method(...)
type = Object_type()
uniqueHexId = method(...)
uniqueId = Object_uniqueId()
updateSlot = Object_updateSlot()
wait = method(s, ...)
while = Object_while()
write = Object_write()
writeln = Object_writeln()
yield = method(...)
Io> Lobby proto proto proto proto slotSummary
==> Object_0x7fb6e7c1e330:
Lobby = Object_0x7fb6e7c1e330
Protos = Object_0x7fb6e7c1e240
_ = "..."
Io>