I have a simple module in Go. Why is a variable not getting incremented when calling Some function?
package example
import "strconv"
var a int = 0
func Some() string {
incr(a)
return "example" + strconv.Itoa(a)
}
func incr(a int) {
a++
}
Because you are passing the value of a. The local a inside incr has incremented.
But not the you have globally created using var a int = 0
If you want you can pass in by reference. Read the difference here
In the below example, i have created two versions of the same method. One does pass by value other pass by reference. Look at the difference in value between a and b.
package main
import (
"fmt"
"strconv"
)
var a int = 0
var b int = 0
func Some() string {
incr(a)
return "example" + strconv.Itoa(a)
}
func Some2() string {
incrPassByReference(&b)
return "example" + strconv.Itoa(b)
}
func incr(a int) {
a++
fmt.Println("passed by value a", a)
}
func incrPassByReference(b *int) {
*b++
fmt.Println("passed by value b", *b)
}
func main() {
val := Some()
val2 := Some2()
fmt.Println("original a", val)
fmt.Println("original b", val2)
}