So you can't write, for { x <- Try(doSomething) x = someValue } yield x We can rewrite that as, for { x <- Try(doSomething) x <- Success(someValue) } yield x but it's a shame we need to.
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Shadowing in Scala's for-comprehensions is a nice feature. It has the feel of mutability, but safer, and shadowing's almost always what you want. for { x <- Try(doSomething) x <- mightFail(x) x <- returnTry(x) } yield x Unfortunately it only works with flatMaps, not maps.
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If you need more convincing, spot the bug here: for { x <- Try(something) x2 <- someOperation(x) x3 <- andAnotherOne(x2) x4 <- somethingElse(x3) x5 <- methodApp(x3) x6 <- oneLastThing(x4) } yield x6 I know it was easy, but *only* because you were looking!
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Oh, I would not usually call them "x". The scope is a bit too big for such an anonymous name...
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Isn't the a good spot to kleisli?
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Often, yes. Though I sometimes want to have other flatMaps between the ones which are operating on the "same" object.
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It does, but it doesn't let you insert operations on different values in between.
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