Question

Please provide the example with syntax of Array in Golang

Answer 1

Array represents a fixed size, named sequence of elements of the same type. You cannot have an array which contains both integer and characters in it. You cannot change the size of an array once You define the size.

The syntax for declaring an array is

var arrayname [size] type

Each array element can be assigned value using the syntax

arrayname [index] = value

Array index starts from 0 to size-1.

You can assign values to array elements during declaration using the syntax

arrayname := [size] type {value_0,value_1,…,value_size-1} 

You can also ignore the size parameter while declaring the array with values by replacing size with … and the compiler will find the length from the number of values. Syntax is

arrayname :=  […] type {value_0,value_1,…,value_size-1}

You can find the length of the array by using the syntax

len(arrayname)

Execute the below Go example to understand the array

package main
import "fmt"

func main() {  
    var numbers [3] string //Declaring a string array of size 3 and adding elements 
    numbers[0] = "One"
    numbers[1] = "Two"
    numbers[2] = "Three"
    fmt.Println(numbers[1]) //prints Two
    fmt.Println(len(numbers)) //prints 3
    fmt.Println(numbers) // prints [One Two Three]

    directions := [...] int {1,2,3,4,5} // creating an integer array and the size of the array is defined by the number of elements 
    fmt.Println(directions) //prints [1 2 3 4 5]
    fmt.Println(len(directions)) //prints 5

    //Executing the below commented statement prints invalid array index 5 (out of bounds for 5-element array)
    //fmt.Println(directions[5]) 
}

Output

Two
3
[One Two Three]
[1 2 3 4 5]
5