Why error handling is explicit in Swift - Quick Recap

Recall & Review

beginner

What does it mean that error handling is explicit in Swift?

It means you must clearly write code to catch and handle errors. Swift forces you to acknowledge possible errors instead of ignoring them.

beginner

Why does Swift require explicit error handling?

To make programs safer and more predictable by forcing developers to think about what can go wrong and handle it properly.

beginner

What Swift keywords are used to handle errors explicitly?

You use try to call a function that can throw an error, catch to handle errors, and throw to signal an error.

intermediate

How does explicit error handling improve code quality?

It helps catch problems early, makes bugs easier to find, and ensures the program can respond to errors instead of crashing unexpectedly.

beginner

What happens if you call a throwing function without using try in Swift?

The code will not compile. Swift requires you to use try to show you are aware the function can throw an error.

Which keyword in Swift is used to call a function that might throw an error?

A handle

B catch

C throw

D try

The try keyword is used to call functions that can throw errors.

What happens if you ignore error handling in Swift when calling a throwing function?

A The code will not compile

B The function runs normally without errors

C The error is automatically handled

D The program crashes at runtime

Swift requires explicit error handling, so the code will not compile if you ignore it.

Why does Swift make error handling explicit?

A To hide errors from users

B To improve safety and clarity

C To make code shorter

D To allow silent failures

Explicit error handling improves safety and makes the code clearer about possible problems.

Which keyword is used to handle errors after a throwing function is called?

A try

B throw

C catch

D error

The catch block is used to handle errors thrown by functions.

What does the throw keyword do in Swift?

A Signals an error occurred

B Handles an error

C Calls a function

D Ignores an error

throw is used to signal that an error has occurred.

Explain why Swift requires explicit error handling and how it benefits your code.

Think about how being clear about errors helps avoid surprises.

Describe the roles of the keywords try, throw, and catch in Swift error handling.

Each keyword has a specific job in managing errors.