Tour of Go 2.0

Arrays

Arrays in Go have a fixed size baked into their type. The type [n]T is an array of exactly n values of type T.

var a [10]int

That declares a as ten integers. You can’t resize it — the length is part of the type.

That sounds limiting, and it is. In practice, you’ll reach for slices almost every time. Arrays are mostly the foundation that slices are built on.

main.go ▶ Run in Playground 
package main

import "fmt"

func main() {
	var a [2]string
	a[0] = "Hello"
	a[1] = "World"
	fmt.Println(a[0], a[1])
	fmt.Println(a)

	primes := [6]int{2, 3, 5, 7, 11, 13}
	fmt.Println(primes)
}