flan/web/examples/control.flan
Joseph Ferano dfd64d89ea The examples are files that run, not prose, so the page cannot drift from them
Copying a snippet into HTML is where a documented language stops being the
real one. Each block on the page is a program here with its recorded output
beside it, and check.sh is what says the page is still true after a change.
2026-09-12 03:40:03 +07:00

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(defconst nums [5 i32] [1 3 8 9 10])
(defn classify [n i32] string
(cond
(< n 0) "negative"
(= n 0) "zero"
:else "positive"))
(defn countdown [n i32]
(let [i n]
(while (> i 0)
(print-i64 (i64 i))
(print-str " ")
(set i (- i 1)))
(newline)))
(defn first-even [s [i32]] (Option i32)
(dotimes [i (len s)]
(when (= 0 (% (at s i) 2))
(return (Some (at s i)))))
None)
(defn main []
(print-line (classify -3))
(countdown 4)
(unless false
(print-line "unless runs when the test is false"))
(match (first-even (slice nums 0 (len nums)))
(Some n) (do (print-i64 (i64 n)) (newline))
None (print-line "none")))