Can’t change entries in range loop
yourbasic.org/golang
Why isn’t the slice updated in this example?
s := []int{1, 1, 1}
for _, n := range s {
n += 1
}
fmt.Println(s)
// Output: [1 1 1]Answer
The range loop copies the values from the slice to a local variable n;
updating n will not affect the slice.
Update the slice entries like this:
s := []int{1, 1, 1}
for i := range s {
s[i] += 1
}
fmt.Println(s)
// Output: [2 2 2]See 4 basic range loop (for-each) patterns for all about range loops in Go.
Share this page:
