Source code in the scala programming language

val l = List(1,2,3,4)
l.foreach {i => println(i)}

l.foreach(println(_))

val a = Array(1,2,3,4)
a.foreach {i => println(i)}
a.foreach(println(_))  '' // same as previous line''

def doSomething(in: int) = {println("Doing something with "+in)}
l.foreach(doSomething)

for(val i <- a) println(i)

val squares = l.map{i => i * i} ''//squares is''  List(1,4,9,16)

val squares = for (val i <- l) yield i * i