将完整切片范围作为参数传递

Question

Considering the code below, I have seen some code using this format v[:] for pass full slice (not part of it) as parameter.

Is there any difference between v[:] and v? Or it is just a developer preference?

The test I did below show me no difference. Am I missing something?

package main

import (
    "fmt"
)

func main() {
    v := []byte {1, 2, 3}

    printSliceInfo(v)
    printSliceInfo(v[:])
}

func printSliceInfo(s []byte) {
    fmt.Printf("Len: %v - Cap: %v - %v
", len(s), cap(s), s)
}

Answer 1

When v is a slice, there is no difference between v and v[:]. When v is an array, v[:] is a slice covering the entirety of the array.