Closures summary

You’ve made it to the end of the sixth part of this series, so let’s summarize:

1. You can assign closures to variables, then call them later on.
2. Closures can accept parameters and return values, like regular functions.
3. You can pass closures into functions as parameters, and those closures can have parameters of their own and a return value.
4. If the last parameter to your function is a closure, you can use trailing closure syntax.
5. Swift automatically provides shorthand parameter names like $0 and $1, but not everyone uses them.
6. If you use external values inside your closures, they will be captured so the closure can refer to them later.

SPONSORED With Sentry’s error and performance monitoring for iOS, you see mobile vitals that actually matter, can solve any latency issues quickly, and learn how each release is performing over time.

Learn More

Sponsor Hacking with Swift and reach the world's largest Swift community!