JSpark

A simple programming language for the JVM. JSpark was designed to be a better Java so there is a lot of syntactic and behavioral overlap.

Hello World

A basic Hello World program written in JSpark

static MainClass {

	def main(){
		println("Hello World!");
	}

}

Math Oriented

Here are two examples of a program which displays the prime numbers up to a given parameter n. One is written in JSpark, and the directly equivalent algorithm in shown in Java.

JSpark

def primes(int n) {
	for n :: if([x : sqrt(n) if i %% x] > 2) :: println(n);
}

Java:

public void primes(int n){
	for(int i = 0; i < n; i++){
		test: {
			if (i % 2 == 0){
				continue;
			}
			for(int j = 3; j <= Math.sqrt(n); j += 3){
				if (i % j == 0){
					break test;
				}
			}
			System.out.println(i);
		}
	}
}

Coolest Features

---

Trivial for loops

for 10 {
	Console.println(i); //Prints 0-9; i is the default variable
}

for j : 10 { //It is also easy to choose a variable name, parentheses are optional
	Console.println(j); //0-9
}

Return-then statements

Ever had to store some result as a local variable before you return it to perform some additional cleanup/logic?

Java code:

void test(){
	Object temp = obj;
	obj = null;
	return temp;
}

JSpark equivalent with return-then:

def test(){
	return obj then obj = null;
}

Explicit single line blocks

for n :: Console.println(i); //Easily and explicitly define single line blocks as opposed to dropping parentheses in Java