Hands-On Full Stack Development with Go

Panics, recovers, and defers

In Go, there is a special built-in function called panic. When you invoke panic in your code, your program is interrupted, and a panic message is returned. If a panic gets triggered and you don't capture it in time, your program will stop execution and will exit, so be very careful when you use a panic. Here is a code example:

func panicTest(p bool) {  if p {    panic("panic requested")  }}

In the preceding example, we wrote a function that checks a flag, p. If p is true, then we throw a panic. The argument to the panic function is the message that wants the panic to return. Here is a more complete program that you can run in Go's playground (http://play.golang.org):

package mainimport "fmt"func main() { panicTest(true) ...