為什麼 Go 給我「聲明錯誤但未使用」錯誤？

Variable Usage in Go

In Go, declaring a variable implies its intended use, and failure to utilize it results in a compile-time error. This practice stems from the language's emphasis on code clarity and the avoidance of unnecessary elements.

The provided code snippet triggers the error "err declared and not used" because the variable "err" is declared but never explicitly used in the code. While there is no scope or shadowing issue at play, the compiler requires that declared variables are appropriately utilized to prevent potential bugs or unused imports that can slow down compilation.

To resolve the error, the variable "err" can be assigned to an unused blank identifier, such as:

var _ = err

Alternatively, "err" can be used to perform error checking, such as:

if err != nil {
    fmt.Println(err.Error())
    return
}

Note that未使用全局变量和未使用的函数参数在 Go 中是可以接受的。然而，始终建议使用您声明的变量，以保持代码的简洁和可读性。

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