What does the Golang function value return?

Golang functions can return multiple values, and the return value type is specified in the function signature. For example, the function sumAndCheck(a, b int) returns integers and Boolean values. To deprecate an unused value, use an underscore _ as a variable, such as unusedValue(a int) _.

Golang function return value: what it is and how it is returned

In Golang programming, a function is a block of code that performs a specific task , can be executed by calling them. Functions can accept input parameters and return output values.

Type of function return value

In Golang, the type of function return value is called Function signature. The syntax of the function signature is as follows:

func 函数名(参数列表) (返回值列表)

where:

• func The keyword represents a function declaration.
• Function name is the name of the function.
• Parameter list is a list of types of parameters accepted by the function, separated by commas.
• Return value list is a list of types of values ​​returned by the function, separated by commas.

Return multiple values

Golang functions can return multiple values. The type of the return value is specified through the function signature. For example, the following function returns an integer and a Boolean value:

func sumAndCheck(a, b int) (int, bool) {
    return a + b, a > b
}

Returns an unused value

Sometimes, you may need to return a value that you don't intend to use it. In this case, you can use the underscore _ as a deprecated variable:

func unusedValue(a int) _ {
    return a * 2
}

Practical example

Suppose you want to write a function to Calculate the sum of two numbers. Here is the Golang code for this function:

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

You can use this function by calling the sum function and passing two integer arguments:

result := sum(10, 20)
fmt.Println(result) // 输出：30

Conclusion

Function return value is an important part of Golang functions, allowing you to retrieve results from the function. To return multiple values, simply specify multiple return types in the function signature. If you don't plan to use the return value, you can deprecate it with an underscore.

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