Go Developer (Go Arrays)

Step by step guide to becoming a Go developer in 2023

What are arrays?

Arrays are used to store multiple values of the same type in a single variable, instead of declaring separate variables for each value.

Write the two ways to declare an array with the var keyword:

var array_name = [length]datatype{values}
var array_name = [...]datatype{values}

Write the two ways to declare an array with := sign:

array_name := [length]datatype{values}
array_name := [...]datatype{values} // here length is inferred

What is the output of this snippet?:
package main
import ("fmt")

func main() {
  var arr1 = [3]int{1,2,3}
  arr2 := [5]int{4,5,6,7,8}

  fmt.Println(arr1)
  fmt.Println(arr2)
}

[1 2 3]
[4 5 6 7 8]

What is the output of this snippet?:
package main
import ("fmt")

func main() {
  var arr1 = [...]int{1,2,3}
  arr2 := [...]int{4,5,6,7,8}

  fmt.Println(arr1)
  fmt.Println(arr2)
}

[1 2 3]
[4 5 6 7 8]

Write a snippet to print the following output with inferred lengths:
[1 2 3]
[4 5 6 7 8]

package main
import ("fmt")

func main() {
var arr1 = [...]int{1,2,3}
arr2 := [...]int{4,5,6,7,8}
fmt.Println(arr1)
fmt.Println(arr2)
}

What is the output of this code:

package main
import ("fmt")

func main() {
  arr1 := [5]int{1:10,2:40}

  fmt.Println(arr1)
}

[0 10 40 0 0]