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/*
Fibonacci sequence
n can be any signed or unsigned integer type
*/
`export fib : Fn[n] $ (
t : `type n
? {
t = Int[Any; .signed; Any] {
? n <= 0 { `return 0 }
}
t = Int[Any; .unsigned; Any] {
? n = 0 { `return 0 }
}
{ `panic "n must be a signed or unsigned Int" }
}
? {
n < 3 { 2 }
{ `sync(fib; n - 1) + fib `sync n - 2 }
}
)
`export fib_string Fn[n] $ (
String $ ("fib("; n; ") = "; fib `sync n; "\n")
)
`is_main Fn $ (
( args ) : `use "sys"
? 3 != `length args {
`return `error String $ (
"Got: "; " " `join args; "\n"
"Usage: "; args `get 0; " "; args `get 1; " <number>\n"
)
}
`print fib_string `sync I64 $ args `get -1
)
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