Pointers in Go
Suppose you have a variable:
age := 20Using &age you get the pointer to the variable, its memory address.
When you have the pointer to the variable, you can get the value it points to by using the * operator:
age := 20
ageptr = &age
agevalue = *ageptrThis is useful when you want to call a function and pass the variable as a parameter. Go by default copies the value of the variable inside the function, so this will not change the value of age:
func increment(a int) {
a = a + 1
}
func main() {
age := 20
increment(age)
//age is still 20
}You can use pointers for this:
func increment(a *int) {
*a = *a + 1
}
func main() {
age := 20
increment(&age)
//age is now 21
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