紧急:运行时错误:Go中的索引超出范围 [英] panic: runtime error: index out of range in Go

问题描述

我具有以下功能，该功能从终端接收命令并根据输入打印内容.这看起来很简单，如果用户键入"add"，则系统将打印一行，如果用户未键入任何内容，则将打印其他内容.

I have the following function that takes a command from terminal and prints something based on input. It seems simple enough, if the user types 'add' the system prints a line, if the user types nothing, it prints something else.

只要用户输入添加，它就起作用.如果用户未输入任何内容，则会抛出

Whenever the user types add, it works. If the user doesn't type anything it throws

紧急:运行时错误:GoLang中的索引超出范围

panic: runtime error: index out of range in GoLang

这是为什么?

  func bootstrapCmd(c *commander.Command, inp []string) error {


     if inp[0] == "add" {
                  fmt.Println("you typed add")
              } else if inp[0] == "" {
                  fmt.Println("you didn't type add")
              }


          return nil

    }

推荐答案

如果用户未提供任何输入，则 inp 数组为空.这意味着即使索引 0 也超出范围，即 inp [0] 也无法访问.

If the user does not provide any input, the inp array is empty. This means that even the index 0 is out of range, i.e. inp[0] can't be accessed.

在检查 inp [0] =="add" 之前，可以使用 len(inp)检查 inp 的长度.这样的事情可能会做到:

You can check the length of inp with len(inp) before checking inp[0] == "add". Something like this might do:

if len(inp) == 0 {
    fmt.Println("you didn't type add")
} else if inp[0] == "add" {
    fmt.Println("you typed add")
}

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