bearcherian / defer-panic-recover

An example of defer, panic, and recover in Go

Defer-Panic-Recover

This is a small program that shows how defer, panic, and recover work in Go.

what it does

The program prompts for some input, any input, and then repeats it back to the screen.

If the user enters q, the program exits.

If the user enters !!!, the program panics.

This panic goes to the calling start() function, where we have deferred a call to recoverMe(), which checks recover(), and, when it identifies a panicked state, calls start() again.

running the code

$ go build
$ ./defer-panic-recover

example output

$ ./defer-panic-recover 
What is the location?
abcd
OK, 'abcd'
Whatchu want?
1234
OK, '1234'
Enter something fun
XYZ
OK, 'XYZ'
Enter something fun
alpha789 omega 3
OK, 'alpha789 omega 3'
Are you being served?
!!!
2019/06/10 18:28:23 AAGGGHH!!!
2019/06/10 18:28:23 recovering %!s(main.fn=0x1097cf0) (AAGGGHH!!!)
Whatchu want?
123
OK, '123'
YO!
q
2019/06/10 18:28:32 Bye-Bye!