Scala: write string to file in one statement

Question

It is strange that no one had suggested NIO.2 operations (available since Java 7):

import java.nio.file.{Paths, Files}
import java.nio.charset.StandardCharsets

Files.write(Paths.get("file.txt"), "file contents".getBytes(StandardCharsets.UTF_8))

I think this is by far the simplest and easiest and most idiomatic way, and it does not need any dependencies sans Java itself.

A concise one line:

import java.io.PrintWriter
new PrintWriter("filename") { write("file contents"); close }

Here is a concise one-liner using reflect.io.file, this works with Scala 2.12:

reflect.io.File("filename").writeAll("hello world")

Alternatively, if you want to use the Java libraries you can do this hack:

Some(new PrintWriter("filename")).foreach{p => p.write("hello world"); p.close}

If you like Groovy syntax, you can use the Pimp-My-Library design pattern to bring it to Scala:

import java.io._
import scala.io._

class RichFile( file: File ) {

  def text = Source.fromFile( file )(Codec.UTF8).mkString

  def text_=( s: String ) {
    val out = new PrintWriter( file , "UTF-8")
    try{ out.print( s ) }
    finally{ out.close }
  }
}

object RichFile {

  implicit def enrichFile( file: File ) = new RichFile( file )

}

It will work as expected:

scala> import RichFile.enrichFile
import RichFile.enrichFile

scala> val f = new File("/tmp/example.txt")
f: java.io.File = /tmp/example.txt

scala> f.text = "hello world"

scala> f.text
res1: String = 
"hello world