As we all know that array has a fixed size and hence you can't be able to resize based on your requirements. On the other hand, Slice is dynamically-sized and provide flexible view into the elements of an array. Hence, Slices are more common than arrays in Go.

Syntax

A slice can be formed from an array using a low and high bound indices which are separated by a colon:

array-name[lowIndex : highIndex]

Example

package main
import "fmt"

func main() {
	num := [5]int{1, 2, 3, 4, 5}

	var slc []int = num[1:4]
	fmt.Println(slc)
}

Check result here

Some interesting facts about Slice in Go

• Slices never store any data

• Slices just describes the section of an array

• If you modify the elements present in a Slice, it's corresponding array elements also will see changes.

• If you omit high or low bounds while slicing, Go automatically use their defaults instead. The default values for low bound is zero and for the high bound is the length of the slice.

• Slice can be created by using built-in function make. The below creates a slice [0 0 0 0 0]

  arr := make([]int, 5)
  

• You can append new elements to Slice by using a built-in append function.

  package main
  import "fmt"
  
  func main() {
      arr := make([]int, 1)
      fmt.Println(arr)
      
      arr[0] = 1 // Changing Slice value
      fmt.Println(arr)
      
      arr = append(arr, 2, 3, 4, 5) // Appending elements to Slice
      fmt.Println(arr)
  }
  

Check Result here