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    <p>You could work around the JVM start-up time by opening the Scala REPL and then loading your scripts directly into it using the <code>:load</code> command. This compiles (it does take some time, but I don't find it long in practice) the contents of the script and loads it for use in the REPL. For example:</p> <pre><code> scala> :load testScript.scala Loading testScript.scala... import scala.collection.mutable.Map memory: scala.collection.mutable.Map[Int,Int] = Map() fib: (Int)Int res7: Int = 165580141 scala> fib(10) res1: Int = 55 scala> fib(11) res2: Int = 89 scala> fib(12) res3: Int = 144 scala> fib(13) res4: Int = 233 </code></pre> <p>For example, a typical workflow of mine when writing different prototypes in Scala is as follows. I have a text editor open in one window, and the Scala REPL in another. I write my code and then load it (<code>:load script.scala</code>). The results produced by the script are immediately available (as seen in the above transcript, <code>res7</code>) and any functions, classes or objects defined in the script are also available. And it's faster than running <code>scala myScript.scala</code> as the JVM is already loaded.</p> <p>If you go the compiled route, use <code>fsc</code> (the fast Scala compiler). The first time it's invoked it creates a daemon process that compiles the code. Therefore you will only have to pay the JVM start-up price once. Just note that if you change the value of <code>CLASSPATH</code> (the environment variable), you'll have to restart <code>fsc</code> (it's something that has bugged me for a while).</p> <p><code>-- Flaviu Cipcigan</code></p>
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    1. POHow to reduce Scala (/ Java) startup overhead?
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    1. USFlaviu Cipcigan
    1. USFlaviu Cipcigan
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      1. VTUpMod
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    1. COEven with fsc there is no way to bring compilation down to a sane (i.e. tool-friendly) startup time. The goal is to reduce startup time once I've compiled it, which is still onerously long.
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    2. COWell, since i'm learning, I liked the REPL :load trick
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      1. USJhonny D. Cano -Leftware-
 

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