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Fibonacci
fib.hd
With a function
With a lambda
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func calculate(n int64) -> int64
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    if((n is 0) or (n is 1))
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        put n
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    end
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    put fib(n-1) + fib(n-2)
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end
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1
var calculate lambda::(int64)->int64 = { x => ((x == 0) or (x == 1)) ? x : calculate(x-1) + calculate(x-2) }
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main.hd
1
with fib from fib.hd
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with console from std:io
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with Int fixed from std:int
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​
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fib.calculate(parse(value=console.in(),raise=false,defaultValue=0))
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Perceptron
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let points double[*] = 
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{
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    {245, 1400},
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    {312, 1600},
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    {279, 1700},
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    {308, 1875},
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    {199, 1100},
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    {219, 1550},
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    {405, 2350},
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    {324, 2450},
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    {319, 1425},
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    {255, 1700}
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}
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​
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var weight = 10.0
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var bias = 100.0
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var lr = 0.000001
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​
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for(_ in range(1000000))
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    for(var point in points)
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        var prediction = point[0] * weight + bias
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        var error = point[1] - prediction
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        var gradient = point[0] * error * lr
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​
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        bias = bias + gradient
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        weight = weight + weight * gradient
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    end
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end
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Factorial
main.hd
1
with console from std:io
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​
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var factorial = { x => (x >= 1) ? x * factorial(x-1) : 1 }
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console.out(factorial(6))
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