Fix a typo in slice-to-array conversion tests. #1089
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Some of the tests that were expecting a panic were using a function literal, but instead of calling it and comparing the result to nil, they were comparing the function itself. This change refactors the test to make such a mistake less likely in future.
nevkontakte
referenced
this pull request
Nov 21, 2021
Conversion is fully supported for slices of numeric types, which is probably the most common use case for this feature judging by the discussion in the proposal. However, it is only partially supported for slices of complex types (e.g. strings), since they are backed by the JavaScript's built-in Array type, which lacks ability to share backing memory among subarrays. Conversion works in cases when the slice is converted into array that exactly matches the slice's underlying array, but panics if we are trying to convert a subslice. I feel like an explicit failure is better than a chance of introducing subtle bugs. It also seems that GopherJS internally doesn't really distinguish between array types and pointer to array types, which makes the whole implementation somewhat messy when it comes to nil vs non-nil pointers to arrays. Last but not least, I've moved pointer cache for numeric arrays into the backing ArrayBuffer, which ensures that pointers are comparable between different subarrays.
flimzy
approved these changes
Dec 16, 2021
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Some of the tests that were expecting a panic were using a function
literal, but instead of calling it and comparing the result to nil, they
were comparing the function itself.
This change refactors the test to make such a mistake less likely in
future.
Kudos to @dominikh for spotting the bug!