What is the return value of golang function?

Go language function return values ​​are typed: function return values ​​must have the specified type. Functions can return multiple values, separated by commas, and can use named return values ​​to improve readability. A function that does not specify a return value type will return a null value (nil).

The return value of Go language function: typing and use

In Go language, a function can return one or more values, which can be of different types. Specifying the type of the return value helps ensure the robustness and readability of your code.

Typed return values

Go language function return values ​​must have an explicit type. This is done by specifying the type after the function name, for example:

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

In this example, the sum function returns a value of type int.

Multiple return values

The function can return multiple values, separated by commas, for example:

func divMod(a, b int) (int, int) {
    return a / b, a % b
}

divMod The function returns a tuple in which the first element is the quotient of integer division and the second element is the remainder.

Named return values

For functions that return multiple values, you can improve readability by using named return values, for example:

func minMax(a, b int) (min, max int) {
    if a < b {
        min, max = a, b
    } else {
        min, max = b, a
    }
    return
}

Practical case: Calculating the Fibonacci sequence

The following is a Go language program that uses the return value, which calculates the first n numbers of the Fibonacci sequence:

package main

import "fmt"

func fib(n int) (int, int) {
    a, b := 0, 1

    for i := 0; i < n; i++ {
        tmp := a
        a, b = b, a+b
    }

    return a, b
}

func main() {
    for i := 0; i < 10; i++ {
        fmt.Printf("%d\n", fib(i))
    }
}

Output:

0
1
1
2
3
5
8
13
21
34

Note:

• If the return value type is not specified, the function will return a null value (nil).
• Even if the return value type of the function is void, this needs to be specified explicitly, for example: func foo() void.

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