The beginning and end of the life cycle of Golang functions

The life cycle of a Go function begins when the function is called and ends when the function call completes and returns. The stages include: 1. Function definition; 2. Function call; 3. Function execution (the local variable life cycle starts from the function call and ends at the return); 4. Function return; 5. Function end (local variables are not available).

Go function life cycle

The life cycle of a function refers to the time period from the creation of the function to the end of the function. The life cycle of a function begins when the function is called and ends when the function call completes and returns.

The life cycle of a Go function involves the following stages:

1. Function definition: When a function is defined, it will be compiled into a function by the compiler object.
2. Function call: When a function is called, a function execution instance will be created for it.
3. Function Execution: In this phase, the statements in the function will be executed. Any variable in a function is a local variable whose life cycle begins when the function is called and ends when the function returns.
4. Function return: When the function completes execution, it will return an (optional) value.
5. End of function: The execution instance of the function is destroyed, and the local variables in the function are no longer available.

Practical case

The following is a simple example of the life cycle of a Go function:

func main() {
    // 定义函数
    func sayHello() {
        fmt.Println("Hello, World!")
    }

    // 调用函数
    sayHello()
}

In this example, sayHello The function is defined in the main function and is called immediately. The fmt.Println statement in the sayHello function will print "Hello, World!".

When the sayHello function returns, its execution instance will be destroyed and the fmt.Println statement in the function will no longer be available.

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