[squeak-dev] Object>>printOn: refined.

Marcel Taeumel marcel.taeumel at hpi.de
Tue Jun 2 12:30:07 UTC 2020

Hi Trygve!

+1 :-)

We do this already in Morph >> #printOn:. There, the format is 

a Morph<knownName>(identityHash)

Am 02.06.2020 14:10:17 schrieb Trygve Reenskaug <trygver at ifi.uio.no>:
I find it frustrating to open 3 inspectors on different objects, all of them titled 'aString' (or whatever),
IMO, it is much better to open them on the 3 objects: [1234] aString, [3456] a String, [4567 a String.
The numbers in square brackets stand for the objects oop, actually its identityHash. They can be a 7-digit numbers; much too long for my short-time memory to hold many of them. I therefore truncate the number to 4 digits, accepting that I may, in rare cases, get 2 objects with the same identifier.

I'm running 'Squeak5.3'.
Object>>printOn: aStream
        "Append to the argument, aStream, a sequence of characters that identifies the receiver."
        " The previous version identified the class, not the instance "
        " This new version identifies the instance with its oop. "
        " I arbitrarily truncate the oop to 4 digits to simplify reading. "

        | title |
        title := self class name.
            nextPutAll: '[' , (self asOop printString truncateTo: 4) , ']' ;
            nextPutAll: (title first isVowel ifTrue: ['an '] ifFalse: ['a ']);
            nextPutAll: title



The essence of object orientation is that objects collaborate  to achieve a goal.
Trygve Reenskaug      mailto: trygver at ifi.uio.no [mailto:%20trygver at ifi.uio.no]
Morgedalsvn. 5A       http://folk.uio.no/trygver/ [http://folk.uio.no/trygver/]
N-0378 Oslo             http://fullOO.info [http://fullOO.info]
Norway                     Tel: (+47) 468 58 625
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