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Code Issues 1 Releases Wiki Activity

Warn about index-of type errors when not iterable

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This is just documentation of existing behavior, it does not change anything.

The reason index-of throws a type error on non-iterable types is because `next` does.
This is hardcoded into the JOP_NEXT opcode (see src/core/value.c:janet_next_impl).

Unfortunately, there is currently no corresponding `iterable?` check.
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Techcable 2022-08-26 14:24:54 -07:00
parent 765eb84c33
commit 699f9622d7
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src/boot/boot.janet
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@ -1072,7 +1072,9 @@
(defn index-of (defn index-of
``Find the first key associated with a value x in a data structure, acting like a reverse lookup. ``Find the first key associated with a value x in a data structure, acting like a reverse lookup.
Will not look at table prototypes. Will not look at table prototypes.
Returns `dflt` if not found.`` Returns `dflt` if not found.
This will throw an error if `ind` is not iterable.``
[x ind &opt dflt] [x ind &opt dflt]
(var k (next ind nil)) (var k (next ind nil))
(var ret dflt) (var ret dflt)