Functions summary
You’ve made it to the end of the fifth part of this series, so let’s summarize:
- Functions let us re-use code without repeating ourselves.
- Functions can accept parameters – just tell Swift the type of each parameter.
- Functions can return values, and again you just specify what type will be sent back. Use tuples if you want to return several things.
- You can use different names for parameters externally and internally, or omit the external name entirely.
- Parameters can have default values, which helps you write less code when specific values are common.
- Variadic functions accept zero or more of a specific parameter, and Swift converts the input to an array.
- Functions can throw errors, but you must call them using
tryand handle errors usingcatch. - You can use
inoutto change variables inside a function, but it’s usually better to return a new value.
SPONSORED Instabug helps you identify and resolve severe crashes quickly. You can retrace in-app events and know exactly which line of code caused the crash along with environment details, network logs, repro steps, and the session profiler. Ask more questions or keep users up-to-date with in-app replies straight from your dashboard. Instabug takes data privacy seriously, so no one sees your data but you! See more detailed features comparison and try Instabug's crash reporting SDK for free.
Save 50% on all books and bundles
The biggest ever Hacking with Swift sale is now on, letting you save 50% on all books and bundles. Learn something new with Swift and enjoy great savings while the sale lasts!
