How to Use break in Go: Syntax and Examples

In Go, the break statement is used to immediately exit a loop or a switch statement. When break is executed, the program stops the current loop iteration and continues with the code after the loop.

Syntax

The break statement can be used inside for, switch, and select blocks to exit them immediately.

Basic syntax:

break

You can also use break with a label to exit an outer loop:

break LabelName

go

for i := 0; i < 5; i++ {
    if i == 3 {
        break
    }
    fmt.Println(i)
}

Example

This example shows how break stops a loop when a condition is met, printing numbers from 0 to 2 only.

go

package main

import "fmt"

func main() {
    for i := 0; i < 5; i++ {
        if i == 3 {
            break
        }
        fmt.Println(i)
    }
    fmt.Println("Loop ended")
}

Output

0
1
2
Loop ended

Common Pitfalls

One common mistake is expecting break to exit multiple nested loops without using labels. By default, break only exits the innermost loop.

To exit an outer loop, use a labeled break.

go

package main

import "fmt"

func main() {
    OuterLoop:
    for i := 0; i < 3; i++ {
        for j := 0; j < 3; j++ {
            if i == 1 && j == 1 {
                break OuterLoop // exits both loops
            }
            fmt.Printf("i=%d, j=%d\n", i, j)
        }
    }
    fmt.Println("Exited loops")
}

Output

i=0, j=0
i=0, j=1
i=0, j=2
i=1, j=0
Exited loops

Quick Reference

Usage	Description
break	Exits the innermost loop or switch immediately
break LabelName	Exits the loop or switch with the specified label
Used in for, switch, select	Controls flow by stopping loops or switch cases early

Key Takeaways

Use break to exit loops or switch statements immediately.

Without labels, break only stops the innermost loop.

Use labeled break to exit outer loops in nested structures.

Place break inside loop or switch blocks to control flow clearly.