Undefined values: Difference between revisions
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m (moved Syntactically explicit undefined to Undefined values) |
(added ocaml) |
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delete obj.c; |
delete obj.c; |
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obj.c == null;</lang> |
obj.c == null;</lang> |
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| ⚫ | |||
<lang ocaml>(* There is no undefined value in OCaml, but one can emulate this with union types *) |
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type value = Int of int | Undefined;; |
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let inc = function |
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Int n -> Int (n+1) |
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| Undefined -> failwith "Undefined argument";; |
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inc (Int 0);; |
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(* - : value = Int 1 *) |
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inc Undefined;; |
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(* Exception: Failure "Undefined argument". *)</lang> |
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=={{header|Oz}}== |
=={{header|Oz}}== |
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{{omit from|Java|everything is null or defined}} |
{{omit from|Java|everything is null or defined}} |
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| ⚫ | |||