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[Arr] group_by: throw when $key_fun returns a non-arraykey type

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azjezz 2020-07-06 19:30:42 +01:00
parent c5400a8571
commit 7c904b60e8
1 changed files with 2 additions and 0 deletions
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2
src/Psl/Arr/group_by.php
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@ -45,6 +45,8 @@ function group_by(iterable $values, callable $key_func): array
continue; continue;
} }
Psl\invariant(is_arraykey($key), 'Expected $key_func to return a value of type array-key, value of type (%s) returned.', gettype($key));
/** @psalm-var Tk $key */
$result[$key] = $result[$key] ?? []; $result[$key] = $result[$key] ?? [];
$result[$key][] = $value; $result[$key][] = $value;
} }