How is the scope of variables and functions determined in the Go language?

In Go, the scope of variables and functions is determined by their declaration location and the export rule:

• Local scope: variables declared inside a function or block are only visible within that block.
• Package scope: variables, functions, and types declared at the package level (outside functions) are visible in all files of that package.
• Exported identifiers: if the name of a variable, function, or type starts with an uppercase letter, it is exported and accessible from other packages.

Example:

package example

var packageVar = 42       // accessible throughout the package
var ExportedVar = 100     // accessible from other packages

func exampleFunc() {
    var localVar = "hello" // visible only inside exampleFunc
    fmt.Println(localVar)
}

Thus, in Go, scope is closely related to the level of declaration and the case of the first letter of the name.