In Go (golang), how to iterate two arrays, slices, or maps using one `range`

Question

To iterate over an array, slice, string, map, or channel, we can use

for _, x := range []int{1, 2, 3} {   // do something } 

How can I iterate over two slices or maps simultaneously? Is there something like following in python?

for x, y in range([1, 2, 3], [4, 5, 6]):     print x, y 

Answer 1

You cannot, but if they are the same length you can use the index from range.

package main  import (     "fmt" )  func main() {     r1 := []int{1, 2, 3}     r2 := []int{11, 21, 31}      if len(r1) == len(r2) {         for i := range r1 {             fmt.Println(r1[i])             fmt.Println(r2[i])         }     } } 

It returns

1 11 2 21 3 31 

Answer 2

If your slices are the same length, use range like this:

for i := range x {     fmt.Println(x[i], y[i]) }