Array

A collection of elements of the same type with a fixed size stored in contiguous memory locations. The [n]T is an array of n values of type T.

Declare an Array

• with var keyword

var arrayName = [length]dataType{values} // length is defined
var arrayName = [...]dataType{values} // length is inferred

• with := sign

arrayName := [length]dataType{values} // length is defined
arrayName := [...]dataType{values} // length is inferred

Accessing Element

To access an element in an array arrayName[index].

package main

import "fmt"

func main() {
	var arr = [5]int{1, 2, 3, 4, 5}
    fmt.Println(arr[0]) // outputs: 1
}

Changing Element

To change an element in an array arrayName[index] = newValue.

package main

import "fmt"

func main() {
	var arr = [5]int{1, 2, 3, 4, 5}
    arr[0] = 10
    fmt.Println(arr[0]) // outputs: 10
}

Array Length

To get the length of an array len(arrayName).

package main

import "fmt"

func main() {
	var arr = [5]int{1, 2, 3, 4, 5}
    var arr2 = [...]int{1, 2, 3, 4, 5,6,7,8,9}

    println(len(arr)) // outputs: 5
    println(len(arr2)) // outputs: 9
}