Golang : 2 dimensional array example

An example of how to create 2 dimensional array in Golang. Since arrays are fixed size construct, we must specify the dimension first before allocating memory for the array and only then we are able to manipulate the array.

Here we go!

 package main

 import (
 "fmt"
 "runtime/debug"
 )

 func main() {

 var rows, columns int

 fmt.Println("Creating a 2 dimensional array of integer type ")
 fmt.Print("Enter number of rows : ")
 fmt.Scan(&rows)

 fmt.Print("Enter number of columns : ")
 fmt.Scan(&columns)

 // allocate memory for 2 dimension array of integer type with
 // [][]int
 // and use number of rows to determine the size
 array := make([][]int, rows)

 // followed by columns
 for i := range array {
 array[i] = make([]int, columns)
 }

 array[0][0] = 0 // in progamming world, starting counting from zero

 array[rows-1][columns-1] = rows * columns // assign value

 // print all assigned values by rows

 for r := range array {
 fmt.Printf("row(%d)  -  %d\n", r, array[r])
 }

 // trigger manual garbage collection to reclaim allocated memory
 array = nil
 debug.FreeOSMemory()
 }

Sample output :

Creating a 2 dimensional array of integer type

Enter number of rows : 4

Enter number of columns : 2

row(0) - [0 0]

row(1) - [0 0]

row(2) - [0 0]

row(3) - [0 8]