The message is "at:put:".  It's a single message send.  I encourage you to
try the ProfStef tutorial to understand the basis.

On Oct 16, 2016 01:17, "CodeDmitry" <> wrote:

> I am trying to do a JavaScript experiment to make Objects behave like
> Smalltalk objects.
> example:
>     "reminder: Smalltalk arrays start at 1."
>     |arr|
>     a := Array new: 1.
>     a at: 1 put: 'Hello, World'.
> Here, the Smalltalk array has a message "at: index put: value" which is
> defined many layers of prototype chaining down, at Object in category
> accessing.
> However there are many messages on the way traversing the prototype chain
> that start with "at:", such as(SequenceableCollection) "at: x ifAbsent: y",
> "at: x incrementBy: y".
> How does Smalltalk tell which message is which? Does it merge the messages
> into a single message such as "at: x put: y" to "atPut(x, y)" at some
> point?
> Without knowing this, I have to traverse the whole call chain and check
> whether each argument is called in a specific way, which is incredibly
> expensive. If there was a single name such as "atPut" I can easily just do
> a
> dictionary lookup for this name and get it at O(1).
> Does Smalltalk actually store each message?
> --
> View this message in context:
> Smalltalk-disambiguate-messages-tp4918946.html
> Sent from the Pharo Smalltalk Users mailing list archive at

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