Fixed-Size Arrays in Go

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Fixed-Size Arrays in Go

Arrays in Go have a fixed size determined at compile time. Unlike slices, arrays cannot grow or shrink. When declared with var, all elements are initialized to the zero value of the element type. You can also initialize arrays with values using the shorthand syntax. The len() function returns the array's length. The range keyword iterates over elements with both index and value.

snippet.go
go
package main
 
import "fmt"
 
func main() {
    var nums [5]int          // Array of 5 integers, initialized to zero
    nums[0] = 10
    nums[1] = 20
    nums[2] = 30
 
    grades := [3]int{95, 87, 92} // Array with initial values
 
    fmt.Println("nums:", nums)       // [10 20 30 0 0]
    fmt.Println("grades:", grades)   // [95 87 92]
    fmt.Println("Length of nums:", len(nums))
 
    for i, v := range nums {
        fmt.Printf("nums[%d] = %d\n", i, v)
    }
}

Breakdown

var nums [5]int

Declares an array of exactly 5 integers, all set to zero (0)

grades := [3]int{95, 87, 92}

Creates an array of 3 elements with specified values

len(nums)

Returns the fixed length of the array, which is 5

for i, v := range nums

Iterates through all elements, i is index, v is value

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Fixed-Size Arrays in Go

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