Examples

Fibonacci

fib.hd

With a function

func calculate(n int64) -> int64
    if((n is 0) or (n is 1))
        put n
    end
    
    put fib(n-1) + fib(n-2)
end

With a lambda

var calculate lambda::(int64)->int64 = { x => ((x == 0) or (x == 1)) ? x : calculate(x-1) + calculate(x-2) }

main.hd

with fib from fib.hd
with console from std:io
with Int fixed from std:int

fib.calculate(parse(value=console.in(),raise=false,defaultValue=0))

Perceptron

let points double[*] = 
{
    {245, 1400},
    {312, 1600},
    {279, 1700},
    {308, 1875},
    {199, 1100},
    {219, 1550},
    {405, 2350},
    {324, 2450},
    {319, 1425},
    {255, 1700}
}

var weight = 10.0
var bias = 100.0
var lr = 0.000001

for(_ in range(1000000))
    for(var point in points)
        var prediction = point[0] * weight + bias
        var error = point[1] - prediction
        var gradient = point[0] * error * lr

        bias = bias + gradient
        weight = weight + weight * gradient
    end
end

Factorial

main.hd

with console from std:io

var factorial = { x => (x >= 1) ? x * factorial(x-1) : 1 }
console.out(factorial(6))