Throwing function

From general perspective, it’s one of Error handling in Swift. In Swift, error is represented by value type (structs, or enum) and conform to the Error protocol.
To mark a function that can throw an error, you mark it with throws keyword before the returned value
```
func canThrowErrors() throws -> String
func cannotThrowErrors() -> String
```
::When you don’t provide throws, you must handle error inside the function itself::
When calling function that throws error, you should use do catch block and using try
When execution is produced an error, it will moved to the catch block
When you create function that throws error, you can use guard let keyword to return early with error specified
Sometimes, you don’t want to handle all the error case, for this you can use try? that produces nil when error

References

Linked Notes:

The idea is based on structured programming. The easiest example is if-else statement where it only execute some block of code conditionally while moving from top to bottom.

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