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<p>Ah, thank you!</p>
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<p>Then this can be moved to Treated.</p>
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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 Levente Uzonyi <leves@caesar.elte.hu><br>
<b>Gesendet:</b> Montag, 30. Dezember 2019 15:27:28<br>
<b>An:</b> squeak-dev@lists.squeakfoundation.org<br>
<b>Betreff:</b> Re: [squeak-dev] The Inbox: Collections-ct.870.mcz</font>
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<div class="PlainText">On Mon, 30 Dec 2019, commits@source.squeak.org wrote:<br>
<br>
> A new version of Collections was added to project The Inbox:<br>
> <a href="http://source.squeak.org/inbox/Collections-ct.870.mcz">http://source.squeak.org/inbox/Collections-ct.870.mcz</a><br>
><br>
> ==================== Summary ====================<br>
><br>
> Name: Collections-ct.870<br>
> Author: ct<br>
> Time: 30 December 2019, 3:01:24.515602 pm<br>
> UUID: cb75296c-0850-d440-97a6-fc1962eef672<br>
> Ancestors: Collections-nice.868<br>
><br>
> Proposal: Refine Dictionary >> #at:ifPresent: not to require an one-arg block.<br>
><br>
> Usage example:<br>
> Smalltalk at: className ifPresent: [self inform: 'Class already exists'. ^ nil].<br>
<br>
That is what Dictionary >> #includesKey: is for:<br>
<br>
(Smalltalk includesKey: className) ifTrue: [self inform: 'Class already exists'. ^ nil].<br>
<br>
Btw, classes should be looked up with #hasClassNamed::<br>
<br>
(Smalltalk hasClassNamed: className) ifTrue: [self inform: 'Class already exists'. ^ nil].<br>
<br>
<br>
Levente<br>
<br>
><br>
> =============== Diff against Collections-nice.868 ===============<br>
><br>
> Item was changed:<br>
> ----- Method: Dictionary>>at:ifPresent: (in category 'accessing') -----<br>
> at: key ifPresent: aBlock<br>
> "Lookup the given key in the receiver. If it is present, answer the value of evaluating the given block with the value associated with the key. Otherwise, answer nil."<br>
><br>
> | v |<br>
> v := self at: key ifAbsent: [^ nil].<br>
> + ^ aBlock cull: v<br>
> - ^ aBlock value: v<br>
> !<br>
<br>
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