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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)

    
emp: [0 0 0 0 0]







    
    
        
    

    






    
    
         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)

    
set: [0 0 0 0 100]







    
    
	fmt.Println("get:", a[4])

    
get: 100







    
    
        
    

    






    
    
         The builtin `len` returns the length of an array.
    
	fmt.Println("len:", len(a))

    
len: 5







    
    
        
    

    






    
    
         Use this syntax to declare and initialize an array in one line.
    
	b := [5]int{1, 2, 3, 4, 5}

    






    
    
	fmt.Println("dcl:", b)

    
dcl: [1 2 3 4 5]







    
    
        
    

    






    
    
         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)

    
2d:  [[0 1 2] [1 2 3]]







    
    
}

    






    
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