The code between the curly braces is collected into a primary constructor of the singleton object, and is executed when the class is initialized. The actual mechanism that the "scala" program uses to “interpret” a Scala source file is that it compiles the Scala source code to Java bytecodes, loads them immediately via a class loader, and executes them.Īpplication trait declares a main method of the appropriate signature, which your singleton object inherits, making it usable as a Scala application. Starts up a daemon to eliminate JVM load time on every compile. scala files after the classes they contain.Ĭan import methods from any object (not just singleton objects) with "import thod" (no need for "static" keyword).Ī script must end in a result expression (not a definition). scala files anything you want, no matter what Scala classes or code you put in them - recommend naming non-script. Scala implicitly imports members of packages: On each such application, the result will be the longest line encountered so far, because the passed function, (a, b) => if (a.length > b.length) a else b, returns the longest of the two passed stringsĭef g() The reduceLeft method applies the passed function to the first two elements in lines, then applies it to the result of the first application and the next element in lines, and so on, all the way through the list. Val longestLine = lines.reduceLeft((a, b) => if (a.length > b.length) a else b) These _N numbers are one-based, instead of zero-based, because starting with 1 is a tradition set by other languages with statically typed tuples, such as Haskell and ML. You can’t access the elements of a tuple like the elements of a list, for example, with “pair(0)” because a list’s apply method always returns the same type, but each element of a tuple may be a different type: _1 can have one result type, _2 another, and so on. Scala infers the type of the tuple to be Tuple2 the Scala library only defines them up to Tuple22. Your options if you want to build a list efficiently by appending elements is to prepend them, then when you’re done call reverse or use a ListBuffer, a mutable list that does offer an append operation, and when you’re done call toList. Therefore, in 1 :: twoThree, the :: method is invoked on twoThree, passing in 1, like this: twoThree.::(1).Ĭlass List does offer an “append” operation -it’s written :+ and is explained in Chapter 24- but this operation is rarely used, because the time it takes to append to a list grows linearly with the size of the list, whereas prepending with :: takes constant time. Operators are left associative unless they end with a colon. Still working through some dependency issues attempting to build Gradle… Download com.esotericsoftware:minlog:1.2 jar and pom, upload to your Maven repo, add repositories it’s moved but there’s still some old dependencies on esotericsoftware. It seems minlog is in between com.esotericsoftware and com.googlecode, i.e.set ANT_OPTS=-Dhttp.proxyHost=proxy -Dhttp.proxyPort=port -Dhttp.proxyUserName=username -Dhttp.proxyPassword=password -Dhttps.proxyHost=proxy -Dhttps.proxyPort=port.Proxy settings for For Ivy (not sure if this is necessary):.If you have a hosted Maven repo, change gradle/adle:.Add the following to /gradle.properties:.Prox圜ommand /c/dev/opt/git/bin/connect.exe -H proxy:port %h %p
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