Go by Example: Arrays

In Go, an array is a numbered sequence of elements of a specific length. In typical Go code, slices are much more common; arrays are useful in some special scenarios.
	`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)`
You can also have the compiler count the number of elements for you with `...`	`b = [...]int{1, 2, 3, 4, 5} fmt.Println("dcl:", b)`
If you specify the index with `:`, the elements in between will be zeroed.	`b = [...]int{100, 3: 400, 500} fmt.Println("idx:", 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)`
You can create and initialize multi-dimensional arrays at once too.	`twoD = [2][3]int{ {1, 2, 3}, {1, 2, 3}, } 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]
dcl: [1 2 3 4 5]
idx: [100 0 0 400 500]
2d:  [[0 1 2] [1 2 3]]
2d:  [[1 2 3] [1 2 3]]

Next example: Slices.