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The Way to Go

The for-range Construct

Explore how to iterate over arrays and slices in Go using the for-range construct. Understand how to access indexes and values, modify slice elements, and apply nested loops for multidimensional slices to manage data structures like matrices.

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Introduction

This construct can be applied to arrays and slices:

for ix, value := range slice1 {
...
}

The first value ix is the index in the array or slice, and the second is the value at that index. They are local variables only known in the body of the for-statement, so value is a copy of the slice item at index ix and cannot be used to modify the slice!

Implementation of range on slices

The following is a simple program that iterates over a slice using the range construct.

Go (1.6.2)
package main
import "fmt"
func main() {
  slice1 := make([]int, 4)
  slice1[0] = 1
  slice1[1] = 2
  slice1[2] = 3
  slice1[3] = 4
  for ix, value := range slice1 {
    fmt.Printf("Slice at %d is: %d\n", ix, value)
  }
}

In this program, we make a slice, slice1, of length 4 at line 5 using the make function. ...