Your First Program

Write a program

Create a file hello.nex anywhere on your filesystem:

def main() =
  print("Hello, Nex!")
  val k = 10
  for i in 1..=5 do
    print(i * k)

Two top-level pieces: a def main() that’s the program’s entry point, and a for loop that prints 10, 20, … 50. Everything in the body uses two-space indentation; there are no braces or semicolons. 1..=5 is an inclusive range; 1..5 would stop at 4.

Run it

From the nex repository root, invoke the interpreter via sbt:

sbt "nexJVM/runMain io.github.edadma.nex.run run /path/to/hello.nex"

Output:

Hello, Nex!
10
20
30
40
50

run parses, elaborates (type-checks), and executes the program with the tree-walking interpreter. It’s the fastest edit/run cycle for development — no native binary involved.

What else run accepts

The same invocation works on any of the examples in the repository:

sbt "nexJVM/runMain io.github.edadma.nex.run run examples/fft/main.nex"

If your program imports other modules (multi-file projects), point run at the entry file and the import graph is discovered from its directory upward — see the Modules chapter in the spec for layout rules.

Next step

Now compile that same program to a native binary.