1

Is there a way to run arbitrary swift code from inside a compiled swift program? Similar to JSCore?

https://developer.apple.com/documentation/javascriptcore

2

Other than shelling out to swift or swiftc, no, not really. You could try looking into how lldb's expression evaluation works, but I wouldn't count on it being suitable for your purposes.

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3

As David pointed out, you can only do this through swift or swiftc.

I implemented this in an open source CLI tool I built recently. Here's a snippet of the Swift file runner.

I learned all about this method through this detailed post.