How to jump to golang tags

You can use labels in Go language to implement jumps. A label is an identifier that ends with a colon (:) and can be placed before any statement, including loops and branching statements.

The syntax format for using label jump is as follows:

label:

statement

where label is the label name and statement is the statement. You can use the goto statement in the statement to jump to the specified label.

The following is a sample code:

package main

import "fmt"

func main() {
    outerLoop:
    for i := 0; i < 5; i++ {
        for j := 0; j < 5; j++ {
            if i == 3 && j == 3 {
                goto outerLoop
            }
            fmt.Printf("(%d,%d) ", i, j)
        }
        fmt.Println()
    }
}

In the above code, outerLoop is used as the label of the outer loop. If i and j are both equal to 3, jump to the location of the outerLoop label, which is the starting position of the outer loop.

The output results are as follows:

(0,0) (0,1) (0,2) (0,3) (0,4) 
(1,0) (1,1) (1,2) (1,3) (1,4) 
(2,0) (2,1) (2,2) (2,3) (2,4) 
(3,0) (3,1) (3,2) 
(0,0) (0,1) (0,2) (0,3) (0,4) 
(1,0) (1,1) (1,2) (1,3) (1,4) 
(2,0) (2,1) (2,2) (2,3) (2,4) 
(3,0) (3,1) (3,2) (3,3) (3,4) 
(4,0) (4,1) (4,2) (4,3) (4,4) 

It can be seen from the output results that when i and j are both equal to 3, the program jumps to the location of the outerLoop label and restarts the outer loop.

Using label jumps can make the logic of the program clearer, but excessive use of label jumps can also make the program difficult to maintain. Therefore, you should consider carefully when using tag jumps to avoid abuse.

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