传递完整的切片范围作为参数 [英] Pass full slice range as parameter

问题描述

考虑以下代码，我已经看到一些使用此格式 v [:] 的代码来传递完整切片(不是其一部分)作为参数.

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

v [:] 和 v 之间是否有区别?还是仅仅是开发人员的偏爱?

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

我在下面进行的测试表明我没有区别.我想念什么吗?

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\n", len(s), cap(s), s)
}

推荐答案

当 v 是切片时， v 和 v [之间没有区别:] .当 v 是一个数组时， v [:] 是一个覆盖整个数组的切片.

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.

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