How to understand golang function signature

Go function signature consists of function name, parameter type and return value type. The parameter type specifies the parameters accepted by the function, separated by commas. The return value type specifies the value returned by the function, also separated by commas. For example, the function signature func add(x int, y int) int means that the function accepts two parameters of type int and returns a sum of type int.

Detailed explanation of Go function signature

The function signature is part of the Go function definition, which specifies the name, parameter type and return of the function value type. Understanding function signatures is important because it helps you determine how to call a function and what it will return.

Format

The format of the function signature is as follows:

func <函数名>(<参数列表>) <返回值列表>

• Function name: The name of the function.
• Parameter list: Parameters accepted by the function, declared by type.
• Return value list: The value returned by the function, declared by type.

Parameter type

Parameter type specifies the type of parameters accepted by the function. Multiple parameters are separated by commas, as follows:

func foo(x int, y string)

Return value type

Return value type specifies the type of value returned by the function. If the function does not return any value, it can be expressed using (). Multiple return values ​​are separated by commas, as shown below:

func bar() (int, string)

Practical case

The following is an example of a function that calculates the sum of two numbers and returns the result:

package main

import "fmt"

// 计算两个数字的和
func add(x int, y int) int {
    return x + y
}

func main() {
    result := add(10, 20)
    fmt.Println(result) // 输出：30
}

In this example, the signature of the function is func add(x int, y int) int. It accepts two parameters of type int, x and y, and returns a sum of type int.

Conclusion

Understanding Go function signatures is crucial to writing correct and efficient code. By following the format and conventions outlined in this article, you can define functions accurately and ensure they work the way you expect.

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