Thursday, December 27, 2018 [Tweets] [Favorites]

@dynamicCallable: Unix Tools as Swift Functions

Always Right Institute:

A new feature in Swift 5 are Dynamic Callable’s. We combine this with the related Dynamic Member Lookup feature to expose the filesystem and Unix shell commands as regular Swift objects and functions.

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This is intended as a demo. It should work just fine, but in the name of error handling and proper Swift beauty, you might want to approach forking processes differently 🤓

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An obvious limitation is that both features are statically typed. You can’t lookup one function thats returns an Int, and another function which returns a String. You have to tell the compiler in advance what type you expect.

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Another limitation is that the reverse is not possible, i.e. you cannot lookup a Callable for a Swift function and dynamically invoke it via m.dynamicallyCall(withArguments:).

Previously: Schema-less Database With Dynamic Swift, Exploring @dynamicMemberLookup.

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