# Simply Scala

Implementation of programming language Scala

Simply Scala is browser-based implementation of Scala language. It was written in 2009 by A.J.Bagwell as an easy way to try Scala without having to install it. Server-side part of it is written in Scala, and client UI uses JavaScript.

Simply Scala works as an interactive interpreter: you enter the code in the input box, press “Evaluate” and watch the results of evaluation (output or messages about defined classes, modules etc.).

## Examples:

### Hello, World!:

Example for versions Simply Scala

In Simply Scala you can evaluate expressions without framing them as objects.

``````println("Hello, World!")
``````

### Factorial:

Example for versions Simply Scala

This examples shows how to define ! as a method applied to Int.

``````def factorial(n: Int): BigInt =
if (n == 0) 1
else factorial(n - 1) * n
class Factorizer(n: Int) {
def ! = factorial(n)
}
implicit def int2fact(n: Int) = new Factorizer(n);

for {i <- List.range(0, 17)}
println(i + "! = " + (i!))
``````

### Fibonacci numbers:

Example for versions Scala 2.7.7-final, Simply Scala

This example shows the usage of lazy evaluations and infinite lists in Scala. Infinite list of Fibonacci numbers is defined using functions `.zip` and `.tail` in the same way as in Haskell example.

``````lazy val fib: Stream[Int] = Stream.cons(1, Stream.cons(1, fib.zip(fib.tail).map(p => p._1 + p._2)))
fib.take(16).print
``````

Example for versions Simply Scala

This example shows that string processing and Math in Scala are implemented similarly to Java.

``````def output(real: Double, imag: Double): String =
if (imag == 0) ""+real
else "("+real+","+imag+")"

def solve(A: Int, B: Int, C: Int)
{   if (A == 0) print("Not a quadratic equation.")
else
{   def D = B*B - 4*A*C
if (D == 0) print("x = "+output(-B/2.0/A, 0))
else if (D > 0) print("x1 = "+output((-B+Math.sqrt(D))/2.0/A, 0)+"\nx2 = "+output((-B-Math.sqrt(D))/2.0/A, 0))
else print("x1 = "+output(-B/2/A, Math.sqrt(-D)/2.0/A)+"\nx2 = "+output(-B/2/A, -Math.sqrt(-D)/2.0/A))
}
}
``````