Does golang have no return?

Recently, there has been a lot of discussion about the absence of return in Golang. In this article, we’ll explore the truth about this topic. We will look at the features of Golang and why it has no return problem.

First of all, we need to know that Golang is a statically typed programming language. This means that when writing code, the type of each variable needs to be explicitly declared and type errors are checked at compile time.

Secondly, Golang supports functional programming. In functional programming, functions are first-class citizens. This means that functions can be passed as arguments to other functions, and another function can be returned from a function.

In Golang, the return value of a function is optional. If no return value is defined, the function's return value is a default value, usually zero value. For example, if a function returns a value of type int but does not explicitly define a return value, the returned value will be 0.

The return value of a function in Golang can be ignored by using a blank identifier (_). For example, the following function only returns a single value, but we used a whitespace identifier to ignore the value:

func add(a int, b int) int {
    return a + b
}

func main() {
    add(1, 2) // 忽略返回值
}

Also, in Golang, a function can return multiple values. For example, the following function will return two values ​​of type int:

func swap(a, b int) (int, int) {
    return b, a
}

This ability allows us to write code in a more elegant way, for example, in a sorting algorithm, it is possible to return the sorted slice as well as the sorted time spent.

The above are the basic knowledge points about return values ​​in Golang. So, why do some people say that Golang does not have return?

Actually, this is because there is no direct return statement in Golang like in other programming languages. For example, in C, you can use the return statement to return the results of a function to the caller.

In Golang, we use return keyword to achieve the same purpose. We can write the code like this:

func add(a int, b int) int {
    return a + b
}

func main() {
    result := add(1, 2)
    fmt.Println(result) // 输出 3
}

In the above example, we use the return keyword to return the result of the add function to the caller and store it in the variable result, and finally output the result through fmt.Println. In this process, we can see that Golang does not use the return statement directly like other programming languages.

To summarize, although Golang does not have a direct return statement like other programming languages, it uses the return keyword to achieve the same function. In Golang, the return value of a function is optional and multiple return values ​​are supported. This design makes Golang code more concise and elegant, and also helps avoid potential errors. When necessary, we can use the return keyword to return the result of the function to the caller.

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