全局和局部变量名冲突 [英] Clashing global and local variable name

问题描述

以下是有问题的代码段:

Here is the code snippet in question:

package main

import (
    "fmt"
)

var a string = "hello"

func main() {
    b := "world"

    fmt.Println(a, b)

    a := "bye"

    fmt.Println(a, b)
}

输出:

hello world
bye world

我的问题是，如何解决全局"和局部"变量a之间的名称冲突?

My question is, how do I resolve name clash between the "global" and "local" variables a?

更具体地说，如何告诉Go使用哪个a?

More specifically, how do I tell Go which a to use?

推荐答案

我认为您的原始示例很好地说明了这种情况.就像大多数编程语言一样，范围也很重要.

I think your original example illustrates the situation well. Just like most in programming languages the scope matters.

最接近用途的范围决定了a的值.因此，如果您在函数内部重新声明(:=)变量，则在该函数的持续时间内，您将拥有值"bye".

The scoping closest to the use is what decides the value of a. So if you redeclare (:=) the variable inside your function, then for the duration of that function you will have the value "bye".

如果您选择在两个事物上使用相同的名称，则结果是内部名称将始终占主导地位.如果您需要两个值，请分别为变量命名.

If you chose to use the same name for two things, the consequence is that the inner name will always dominate. If you need both values then name the variables differently.

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