Interviewer: talk about log The difference between fatal and panic

Be familiar with the difference between the two , You need to know os.Exit() function .

I'll cut one here Go Explanation in the source code ：

We need to pay attention to two points ：

1、 The application will be immediately exited

2、defer Function will not be executed

You can understand that this is direct kill -9 Program , Don't give any chance to breathe .

Now let's see log.Fatal Definition of function ：

As a whole , He was in os.Exit() I made a log output before .

His process can be understood as ：

1、 Printouts

2、 exit from application program

3、defer Function still won't execute

Finally, let's take a look at panic The definition of ：

What we need to pay attention to ：

1、 The current function will stop executing immediately （ Not the main program ）

2、defer Function does not execute

3、 Back to the caller caller

4、 The calling function pretends to receive panic function , So they will also perform the above operations

5、 Recursive execution , Up to the top function , If there is no function to handle this exception , The application will stop

This is similar to that in other languages try catch It's like , however Go There is no similar grammatical sugar in language .

Did you stop learning ？