ostretsov

object OmitParenthesis {
  def test = "test"
  def test2() = "test2"
  
  def main (args: Array[String]): Unit = {
    println(test)
//    println(test()) // it's impossible
    println(test2)
    println(test2())
  }

ostretsov

class NewYear(y: Int) {
  val MinYear = 2014
  require(y > MinYear)

  val year = y

  def this() = this(2015)

  override def toString = "Upcoming year is "+year
}

ostretsov

def gcd(a: Int, b: Int): Int = {
  if (b == 0) a else gcd(b, a % b)
}

ostretsov

def >:-> { println("That's awful!!!") }

def main (args: Array[String]) {
  >:->
  $greater$colon$minus$greater // this will also successful print awful message
}

ostretsov

val a = if (3 > 2) 5 else 6
val b = if (7 > 6) { 25; 4; 3 } else { 0 }

ostretsov

var line = ""
while ((line = file.readLine) != "") {
  println(line)
}

ostretsov

val inputFiles = new File("/somewhere/src").listFiles

for {
  file <- inputFiles
  if file.isFile
  line <- scala.io.Source.fromFile(file).getLines()
  trimmed = line.trim
  if trimmed.matches(".*scala.*")
} println(file+": "+trimmed)

ostretsov

val a = try {
  throw new Exception
  888 // it would't be result in value ever
} catch {
  case ex: Exception => 777
}

println(a)

ostretsov

for (
  file <- inputFiles
  if file.isFile
) {
  var ln = 0
  for (line <- scala.io.Source.fromFile(file).getLines()) {
    ln += 1
    if (line.matches(".*scala.*")) {
      println(file.getName+", "+ln+": "+line.trim)
    }

ostretsov

for (
  file <- inputFiles
  if file.isFile
) {
  val lines = scala.io.Source.fromFile(file).getLines().toList

  def grepScalaFrom(ln: Int): Unit = {
    if (ln >= lines.length) -1
    else {
      if (lines(ln).matches(".*scala.*")) println(file+", "+(ln+1)+": "+lines(ln).trim)