Examples

The repository’s examples/ directory holds these plus many more (showcase.j, wordcount.j, encoding.j, net.j, archive.j, …) - all golden-tested by cmd/jennifer/examples_test.go.

Strings

# greeting.j
use io;

def name as string init "Jennifer";
io.printf("hello, " + $name + "!\n");

Output:

hello, Jennifer!

FizzBuzz

# fizzbuzz.j
use io;

for (def i as int init 1; $i <= 15; $i = $i + 1) {
    if ($i % 15 == 0) {
        io.printf("FizzBuzz\n");
    } elseif ($i % 3 == 0) {
        io.printf("Fizz\n");
    } elseif ($i % 5 == 0) {
        io.printf("Buzz\n");
    } else {
        io.printf("%d\n", $i);
    }
}

Factorial (recursion + parameters)

# factorial.j
use io;

func fact(n as int) {
    if ($n == 0) { return 1; }
    return $n * fact($n - 1);
}

for (def i as int init 0; $i <= 8; $i = $i + 1) {
    io.printf("%d! = %d\n", $i, fact($i));
}

More substantive examples

For programs that exercise the full feature surface - lists, maps, iteration, the core and strings libraries - see examples/showcase.j (every feature in one file) and examples/wordcount.j (word-frequency analyzer with histogram, nested aggregation, and a 3x3 grid demo). Both are part of the golden test suite.