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@SethTisue
Created May 24, 2011 17:58
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eliminating a mutable buffer
import java.io._
def userStream =
new BufferedReader(
new InputStreamReader(
new FileInputStream("/etc/passwd")))
// imperative style
def linesI(s: BufferedReader): List[String] = {
val buf = new collection.mutable.ListBuffer[String]
while(true) {
val line = s.readLine()
if(line == null)
return buf.toList
buf += line
}
error("wtf")
}
// functional style
def linesF(s: BufferedReader): List[String] =
Iterator.continually(s.readLine()).takeWhile(_ != null).toList
linesI(userStream).foreach(println)
linesF(userStream).foreach(println)
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