Golang label breaks

This is a creation in Article, where the information may have evolved or changed.

When we are nesting for multiple layers, we sometimes need to jump out of all nested loops, so we can use the Go label breaks feature.

Let's look at an example code:

Package Main

Import (
"FMT"
)

Func Main () {
Fmt. Println ("1")

Exit:
For I: = 0; I < 9; i++ {
For j: = 0; J < 9; J + + {
If I+j > 15 {
Fmt. Print ("Exit")
Break Exit
}
}
}

Fmt. Println ("3")
}

Execution effect:

Attention

• The label is written at the beginning of the for loop and not at the end. And Goto are not the same. Although it is a direct break exit to the specified location.

The difference between a break's label and a goto label can be found in the following code:

Jloop:
For I: = 0; I < 10; i++ {
Fmt. Println ("Label i is", i)
For j: = 0; J < 10; J + + {
If J > 5 {
Jumped out of the way, but it's not going to come in this for loop anymore.
Break Jloop
}
}
}

Jump Statement goto statement can jump to a label within this function
Gotocount: = 0
Gotolabel:
gotocount++
If Gotocount < 10 {
Goto Gotolabel//If it is less than 10, jump to Gotolabel
}

The Break tab can jump out of a for loop, and can also jump out of a select switch loop, referring to the following code:

L
for; Count < 8192; count++ {
Select {
Case e: = <-self.pidch:
Args[count] = E

Default
Break L//Jump out of select and for loop
}

}

Reference:

Go ' s block and identifiers scope
http://studygolang.com/articles/1438