Todd Ditchendorf
I'm curious: What's better about Swift's `defer` than `try/finally` in ObjC or Java (or virtually any other language since 1990)?
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@iTod Keep related blocks of code together.
Michael Tsai
@mjtsai So it is a syntactical difference. Thanks. (AFAICT, this is the only significant difference besides cultural).
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@iTod Yes, mainly the syntax is much more convenient and readable. And there is the codegen difference because it’s not based on exceptions. -
@mjtsai Hm, you're fist to mention that. Is `try/finally` (with no `catch`) significantly different from `defer` from a codegen perspective? -
@iTod Haven't looked at the assembly, but I would assume yes because try/finally has to essentially catch and rethrow the exception. -
@mjtsai Hm, that's interesting. So they're only different if an exception is thrown. But in non-exceptional case, it should be same as defer -
@iTod Yes, if we're talking about runtime behavior, and we have zero-cost exceptions. But I thought we were talking about codegen. -
@mjtsai Ah, right. Interesting.
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