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Add the fact that functions ending with ! may allocate to the FAQ #58904

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Jul 8, 2025
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Add the fact that functions ending with ! may allocate to the FAQ #58904

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6 changes: 6 additions & 0 deletions doc/src/manual/faq.md
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Expand Up @@ -391,6 +391,12 @@ julia> twothreearr()
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### Is a function that ends with `!` allowed to allocate?

Yes! A function name ending with `!` indicates that the function mutates at
least one of its arguments (typically the first argument). However, it may
still allocate a scratch space to expedite computation or produce that result.

## Types, type declarations, and constructors

### [What does "type-stable" mean?](@id man-type-stability)
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