Working with Slices

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Working with Slices

Slices are dynamic, growable sequences in Go. Unlike arrays, slices can change size. The `append` function adds elements and automatically grows the underlying array when needed. `len()` returns the number of elements, `cap()` returns the underlying array's capacity.

snippet.go
go
package main
 
import "fmt"
 
func main() {
    nums := []int{10, 20, 30}
    nums = append(nums, 40)
    
    fmt.Println("Length:", len(nums))
    fmt.Println("Capacity:", cap(nums))
    fmt.Println("Third element:", nums[2])
}

Breakdown

nums := []int{10, 20, 30}

Creates a slice with three integers using composite literal syntax

append(nums, 40)

Adds 40 to the slice, automatically resizing if capacity is exceeded

len(nums) / cap(nums)

len returns element count, cap returns underlying array capacity

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Working with Slices

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