Labelled break and continue in Go - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a labelled break in Go?

A labelled break in Go is used to exit an outer loop from inside an inner loop by specifying the label name of the outer loop.

beginner

How does labelled continue differ from a normal continue in Go?

Labelled continue skips the current iteration of the loop identified by the label, which can be an outer loop, while normal continue only affects the innermost loop.

beginner

Show the syntax of a labelled break in Go.

labelName: for condition { for condition { if someCondition { break labelName } } }

intermediate

Why use labelled break or continue instead of normal break or continue?

They allow you to control outer loops directly from inner loops, making it easier to manage complex nested loops without extra flags or complicated logic.

beginner

Can you use labelled break or continue without defining a label?

No, labelled break and continue require a label to specify which loop to affect. Without a label, break and continue only affect the innermost loop.

What does a labelled break do in Go?

A Exits the loop with the specified label

B Skips the current iteration of the innermost loop

C Restarts the program

D Pauses the loop execution

A labelled break exits the loop identified by the label, which can be an outer loop.

Which keyword is used to skip to the next iteration of a labelled loop in Go?

A next

B break

C skip

D continue

The continue keyword, when used with a label, skips to the next iteration of the labelled loop.

What happens if you use break without a label inside nested loops?

A It breaks the outermost loop

B It breaks the innermost loop only

C It breaks all loops

D It causes a compile error

A break without a label only exits the innermost loop.

Is this valid Go code? outer: for i := 0; i < 3; i++ { for j := 0; j < 3; j++ { if j == 1 { continue outer } } }

A Yes, but it breaks the outer loop

B No, continue cannot have a label

C Yes, it continues the outer loop

D No, labels cannot be used with continue

In Go, continue can be used with a label to skip to the next iteration of the labelled loop.

What is the purpose of labels in Go loops?

A To name loops for use with break and continue

B To declare variables

C To define functions

D To comment code

Labels name loops so break and continue can refer to outer loops.

Explain how labelled break works in Go with an example.

Think about how to stop an outer loop from inside an inner loop.

Describe the difference between normal continue and labelled continue in Go.

Consider which loop each continue affects.