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Make a backup file: Difference between revisions
Scala contribution added.
(→{{header|Java}}: Added main() methods to both versions plus sample data file to backup.) |
(Scala contribution added.) |
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original</pre>
=={{header|Scala}}==
===Imperative version (Ugly, side effects)===
{{trans|Java}}
<lang Scala>import java.io.{File, PrintWriter}
import java.nio.file.{Files, Paths, StandardCopyOption}
object Backup extends App {
def saveWithBackup(filename: String, data: String*): Unit = { //toRealPath() follows symlinks to their ends
val (file, backFile) = (Paths.get(filename).toRealPath(), new File(filename + ".backup"))
if (!backFile.exists) { // ensure the backup file exists so we can write to it later
backFile.createNewFile
}
val back = Paths.get(filename + ".backup").toRealPath()
Files.move(file, back, StandardCopyOption.REPLACE_EXISTING)
val out = new PrintWriter(file.toFile)
for (i <- 0 until data.length) {
out.print(data(i))
if (i < data.length - 1) out.println()
}
}
saveWithBackup("original.txt", "fourth", "fifth", "sixth")
}</lang>
=={{header|Tcl}}==
<lang tcl>package require Tcl 8.5
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