From 6ff145b50b2b56d610a16cc047c311d3f3552bf4 Mon Sep 17 00:00:00 2001 From: Lieuwe Rooijakkers Date: Thu, 14 Nov 2019 18:01:38 +0100 Subject: 'null?' builtin --- VM.hs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'VM.hs') diff --git a/VM.hs b/VM.hs index 7baea0d..a272829 100644 --- a/VM.hs +++ b/VM.hs @@ -112,7 +112,7 @@ vmRunBuiltin state "=" [a, b] = return (if equalOp a b then RVNum 1 else RVNum 0 vmRunBuiltin state "<=" [RVNum a, RVNum b] = return (RVNum (fromEnum (a <= b)), state) vmRunBuiltin state "+" [RVNum a, RVNum b] = return (RVNum (a + b), state) vmRunBuiltin state "-" [RVNum a, RVNum b] = return (RVNum (a - b), state) --- TODO: null? +vmRunBuiltin state "null?" [v] = return (RVNum (case v of { RVList [] -> 1; _ -> 0 }), state) vmRunBuiltin state "car" [RVList l] = case l of a : _ -> return (a, state) _ -> throw "Empty list in 'car'" -- cgit v1.2.3-70-g09d2