Go by Example: Arrays

In Go, an array is a numbered sequence of elements of a specific length.
	package main
	import "fmt"
	func main() {
Here we create an array `a` that will hold exactly 5 `int`s. The type of elements and length are both part of the array’s type. By default an array is zero-valued, which for `int`s means `0`s.	var a [5]int fmt.Println("emp:", a)
We can set a value at an index using the `array[index] = value` syntax, and get a value with `array[index]`.	a[4] = 100 fmt.Println("set:", a) fmt.Println("get:", a[4])
The builtin `len` returns the length of an array.	fmt.Println("len:", len(a))
Use this syntax to declare and initialize an array in one line.	b := [5]int{1, 2, 3, 4, 5} fmt.Println("dcl:", b)
Array types are one-dimensional, but you can compose types to build multi-dimensional data structures.	var twoD [2][3]int for i := 0; i < 2; i++ { for j := 0; j < 3; j++ { twoD[i][j] = i + j } } fmt.Println("2d: ", twoD) }

Note that arrays appear in the form `[v1 v2 v3 ...]` when printed with `fmt.Println`.	$ go run arrays.go emp: [0 0 0 0 0] set: [0 0 0 0 100] get: 100 len: 5 dcl: [1 2 3 4 5] 2d: [[0 1 2] [1 2 3]]
You’ll see slices much more often than arrays in typical Go. We’ll look at slices next.

Previous example: Switch.

Next example: Slices.