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<p>Nice idea! Hmm... I can't figure out a real example, maybe something like this?</p>
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<div>(1 to: 20) asArray shuffled</div>
<div> do: [:ea | Transcript show: ea]</div>
<div> separatedBy: [:prev :next | Transcript show: ( prev <=> next caseOf: {</div>
<div> [-1] -> [#<]. [0] -> [#=]. [1] -> [#>]} )]</div>
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<div><font size="3" color="black"><span style="font-size:12pt"><a href="http://www.hpi.de/" target="_blank" rel="noopener noreferrer" id="LPNoLP"><font size="2"><span id="LPlnk909538"><font color="#757B80"></font></span></font></a></span></font></div>
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<div class="x__rp_T4" id="x_Item.MessagePartBody">Still, the example is rather fictive ...</div>
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<div class="x__rp_T4" id="x_Item.MessagePartBody">Best,</div>
<div class="x__rp_T4" id="x_Item.MessagePartBody">Christoph</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>Von:</b> Squeak-dev <squeak-dev-bounces@lists.squeakfoundation.org> im Auftrag von commits@source.squeak.org <commits@source.squeak.org><br>
<b>Gesendet:</b> Mittwoch, 14. April 2021 14:51:12<br>
<b>An:</b> squeak-dev@lists.squeakfoundation.org<br>
<b>Betreff:</b> [squeak-dev] The Inbox: Collections-mt.941.mcz</font>
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<div class="PlainText">A new version of Collections was added to project The Inbox:<br>
<a href="http://source.squeak.org/inbox/Collections-mt.941.mcz">http://source.squeak.org/inbox/Collections-mt.941.mcz</a><br>
<br>
==================== Summary ====================<br>
<br>
Name: Collections-mt.941<br>
Author: mt<br>
Time: 14 April 2021, 2:51:04.673628 pm<br>
UUID: 93df256c-2d6c-e246-87aa-4296ff9c993d<br>
Ancestors: Collections-ul.940<br>
<br>
(Not a) proposal. In #do:separatedBy: optionally provide the elements around that separation to the block. Looks like an interleaved combination of #do: and #overlappingPairsDo:.<br>
<br>
Here is a (not convincing) example:<br>
<br>
(1 to: 20)<br>
do: [:num | Transcript showln: num]<br>
separatedBy: [:a :b | Transcript showln: a+b]<br>
<br>
Maybe this is something. Haven't found a good example yet.<br>
<br>
=============== Diff against Collections-ul.940 ===============<br>
<br>
Item was changed:<br>
----- Method: Collection>>do:separatedBy: (in category 'enumerating') -----<br>
do: elementBlock separatedBy: separatorBlock<br>
"Evaluate the elementBlock for all elements in the receiver,<br>
and evaluate the separatorBlock between."<br>
<br>
+ | beforeFirst lastSeen | <br>
- | beforeFirst | <br>
beforeFirst := true.<br>
self do:<br>
[:each |<br>
beforeFirst<br>
ifTrue: [beforeFirst := false]<br>
+ ifFalse: [separatorBlock cull: lastSeen cull: each].<br>
+ elementBlock value: each.<br>
+ lastSeen := each]!<br>
- ifFalse: [separatorBlock value].<br>
- elementBlock value: each]!<br>
<br>
Item was changed:<br>
----- Method: SequenceableCollection>>do:separatedBy: (in category 'enumerating') -----<br>
do: elementBlock separatedBy: separatorBlock<br>
"Evaluate the elementBlock for all elements in the receiver,<br>
and evaluate the separatorBlock between."<br>
<br>
+ | lastSeen |<br>
1 to: self size do:<br>
[:index |<br>
+ index = 1 ifFalse: [separatorBlock cull: lastSeen cull: (self at: index)].<br>
+ lastSeen := self at: index.<br>
+ elementBlock value: lastSeen]!<br>
- index = 1 ifFalse: [separatorBlock value].<br>
- elementBlock value: (self at: index)]!<br>
<br>
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