Hi Christoph,


> On Jan 19, 2020, at 3:26 PM, commits at source.squeak.org wrote:
> 
> Christoph Thiede uploaded a new version of Collections to project The Inbox:
> http://source.squeak.org/inbox/Collections-ct.872.mcz
> 
> ==================== Summary ====================
> 
> Name: Collections-ct.872
> Author: ct
> Time: 20 January 2020, 12:26:15.859545 am
> UUID: 9d48e360-1121-6541-ba00-1d06311f2f0c
> Ancestors: Collections-nice.870
> 
> Implement #at:ifPresent: on SequenceableCollection
> 
> Text theQuickBrownFox at: 42 ifPresent: [:char |
>    self inform: ({char.char} joinSeparatedBy: $.) asUppercase].
> 
> =============== Diff against Collections-nice.870 ===============
> 
> Item was added:
> + ----- Method: SequenceableCollection>>at:ifPresent: (in category 'accessing') -----
> + at: index ifPresent: aBlock
> + 
> +    ^ self at: index ifPresent: aBlock ifAbsent: []!

Why is this in SequenceableCollection abd not KeyedCollection?  Would it not work if implemented in Collection itself? Methods shouldn’t as general as possible. For e smoke, just because one needs a method to operate in Strings doesn’t mean it is t more useful higher up in ArrayedCollection.  Thought extended here pays dividends later on.

> 
>