Handling of multiple return values ​​​​from golang functions

Go language functions support returning multiple values, separated by commas in type declarations. Use x, y := myFunction() to get the return value. For example, the calculateRectangle function returns area and perimeter, which can be obtained respectively through area, perimeter := calculateRectangle(length, width). Return values ​​can be named to improve readability. If you are not interested in part of the return value, you can use underscores to ignore it.

Handling of multiple return values ​​from functions in Go language

In Go language, functions can return multiple values. This is useful for situations where multiple related pieces of information need to be returned simultaneously.

Return multiple values

To return multiple values, just use commas to separate the types in the function signature, like this:

func myFunction() (int, string) {
    return 1, "hello"
}

Get multiple return values

To get multiple return values ​​from a function, use the following syntax:

x, y := myFunction()

x and y will respectively receive the first one returned by the function and the second value.

Practical Case

Consider a function that calculates the area and perimeter of a rectangle:

func calculateRectangle(length, width int) (int, int) {
    area := length * width
    perimeter := 2 * (length + width)
    return area, perimeter
}

In the main function, we can use this function as follows:

func main() {
    length := 5
    width := 10
    area, perimeter := calculateRectangle(length, width)
    fmt.Printf("Area: %d, Perimeter: %d\n", area, perimeter)
}

Named return values

In some cases, named return values ​​may be useful. This can make the code more readable and maintainable.

func calculateRectangle(length, width int) (area, perimeter int) {
    area = length * width
    perimeter = 2 * (length + width)
    return
}

Ignore return values

If you are not interested in some return values ​​​​of a function, you can use the underscore (_) to ignore them.

_, perimeter := calculateRectangle(length, width)

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