Skip to content

Latest commit

 

History

History
63 lines (56 loc) · 1.26 KB

7_scala.md

File metadata and controls

63 lines (56 loc) · 1.26 KB
  • Loops 
    for( i <- 1 to 10)
  println(i)
  
//multiple variables
for( i <- 1 to 5; j <- 6 to 10) {
  println(i)
  println(j)
}
//for each i it will print 6 to 10
  • There is no break and continue
  • Reading input: 
    import scala.io.StdIn.{readLing, ...}
readLine()  //read input as string
readInt()
readLong()
readDouble()
readByte()
readShort()
  • Printing output: 
    printf("Hello number: %d\n", 123)
println(s"Hello world")

val age = 90
println(f"I am ${currentAge+2} years old")
  • String manipulation: 
    //indexing
var arrString = "I am a string"
println("3rd index element: " + arrString(3))

//concatenation
s1 = s1.concat(" end")

//eqality
s1.equals(s2) //returns boolean

//get index of query string
i = s1.indexOf("end")
  • Functions: 
    def foo(param1:<data type>, ...) : <return type> = {
  return param1 + param2  //return keyword not required
}

//functions which don't return => procedures
def bar() : Unit = {
  <body>
}
  • Arrays: 
    val arr = Array("hello", "world")
arr(0) = "bye"  //modify 0th index. TODO: how val array is mutable?

val arr = new Array[Int](10)  //array of 20 integers allocated