How to Use the Scala Compiler

To use the Scala Compiler, follow these steps:

  1. In the code editor, write your Scala code.
  2. Click the "RUN" button to compile and run your code.
  3. The output will be displayed in the console below the code editor.

Taking Inputs

In Scala, you can take inputs from the user in various ways. Here are some examples:

String Input

println("Enter a string:")
val input =
println("You entered: " + input)

Number Input

println("Enter a number:")
val num =
println("You entered: " + num)

Importing Libraries

Scala has a rich set of built-in libraries that can be used in your programs. Here are some examples:

Using the Math Library

val result = math.sqrt(25)
println("Square root of 25 is " + result)

Using the ArrayBuffer Class

import scala.collection.mutable.ArrayBuffer

val arr = ArrayBuffer(1, 2, 3, 4, 5)
println("Array: " + arr)

Syntax 101

Scala is a statically typed, multi-paradigm programming language that integrates features of both object-oriented and functional programming. Here's a primer on the major syntax basics of Scala:


Variables in Scala can be either mutable (var) or immutable (val).

val name = "John Doe" // Immutable variable
var age = 25 // Mutable variable

Control Structures

Scala includes control structures such as if, else, for, while, and match.

// If-Else
if (age > 18) {
} else {

// For loop
for (i <- 0 until 5) {

// Match
day match {
    case "Monday" => println("Start of the work week")
    case "Friday" => println("End of the work week")
    case _ => println("Midweek")


Functions in Scala are first-class values and can be stored in variables, passed as arguments, and returned as results.

def greet(name: String): Unit = {
    println("Hello, " + name)

greet("John Doe") // Calls the function with "John Doe" as the argument


Classes in Scala are blueprints for creating objects. They can have parameters and fields, as well as methods.

class Person(name: String, age: Int) {
    def greet(): Unit = {
        println("Hello, " + name)

val person = new Person("John Doe", 25)
person.greet() // Calls the greet method of the person object

Scala Online Test

A Scala online test is an effective way to assess an individual's Scala programming skills. These tests typically include a mix of theoretical questions and practical

coding challenges. By attempting these tests, candidates can demonstrate their understanding of Scala concepts, their problem-solving abilities, and their proficiency in writing efficient code. Scala online tests are commonly used in technical interviews, coding bootcamps, and online learning platforms to gauge a learner's understanding and proficiency in Scala.