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    <p>I'm not privy to inside information on the actual reasons, but my suspicion is very simple. Scala makes side-effectful loops awkward to use so that programmers will naturally prefer for-comprehensions.</p> <p>It does this in many ways. For instance, you don't have a <code>for</code> loop where you declare and mutate a variable. You can't (easily) mutate state on a <code>while</code> loop at the same time you test the condition, which means you often have to repeat the mutation just before it, and at the end of it. Variables declared inside a <code>while</code> block are not visible from the <code>while</code> test condition, which makes <code>do { ... } while (...)</code> much less useful. And so on.</p> <p>Workaround:</p> <pre><code>while ({bytesRead = in.read(buffer); bytesRead != -1}) { ... </code></pre> <p>For whatever it is worth.</p> <p>As an alternate explanation, perhaps Martin Odersky had to face a few very ugly bugs deriving from such usage, and decided to outlaw it from his language.</p> <p><strong>EDIT</strong></p> <p><a href="https://stackoverflow.com/users/243300/pollak">David Pollack</a> has <a href="https://stackoverflow.com/questions/1998724/what-is-the-motivation-for-scala-assignment-evaluating-to-unit-rather-than-the-va/2000517#2000517">answered</a> with some actual facts, which are clearly endorsed by the fact that <a href="https://stackoverflow.com/users/210303/martin-odersky">Martin Odersky</a> himself commented his answer, giving credence to the performance-related issues argument put forth by Pollack.</p>
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    1. POWhat is the motivation for Scala assignment evaluating to Unit rather than the value assigned?
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    1. USDaniel C. Sobral
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    1. COSo presumably the `for` loop version would be: `for (bytesRead <- in.read(buffer) if (bytesRead) != -1` which is great except that it won't work because there's no `foreach` and `withFilter` available!
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