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15123940
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2013-02-28T09:31:58.237
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2013-02-28T09:31:58.237
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The standard filter in <code>for-yield</code> is obtained with <code>x <- y if f(x,..)</code>. Here is an example that uses a Partial Function. <pre><code>val m: PartialFunction[Event, Event] = ev => ev.sport match { case "FOOTBALL" => new FootballEvent(ev) case "SOCCER" => new SoccerEvent(ev) }; for { ev <- data if m.isDefindAt(ev) val x = m(ev) } yield x // or, without the temporary binding: for (ev <- data if m.isDefindAt(ev)) yield m(ev) </code></pre> Note the similarity with <a href="https://scala-lang.org/archives/downloads/distrib/files/nightly/docs/library/index.html#scala.collection.Traversable"><code>Traversable.collect</code></a>1 mentioned in the other answer, which has this signature <code>def collect[B](pf: PartialFunction[A, B]): CC[B]</code> and returns "a new collection resulting from applying the given partial function pf to each element on which it is defined and collecting the results". An alternative without <code>if</code> is a variation of bwroga's deleted answer: <pre><code>for { ev <- data; x <- ev.sport match { case "FOOTBALL" => Some(new FootballEvent(ev)) case "SOCCER" => Some(new SoccerEvent(ev)) case _ => None } } yield x </code></pre> This filters by subsequently iterating through None (i.e. "0 items") or Some (i.e. "1 item") after the initial map. <hr> 1 If someone can tell me how to link to individual methods in the "new" scaladoc, I'd be most grateful.
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1. COThanks! I ended up trying all of the approaches
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