| object KLSigPipeFun: | |
| def main(args: Array[String]) = | |
| val lines = scala.io.Source.stdin.getLines() | |
| val lineNumbers = Iterator.from(1) | |
| val numberedLines = lineNumbers.zip(lines) | |
| val okLines = numberedLines takeWhile: _ => | |
| !scala.sys.process.stdout.checkError() | |
| val outLines = okLines map: | |
| case (number, line) => println(s"$number: line") | |
| println(s"${outLines.length} lines counted") |
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A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.
val square : Int => Int = x => x * x