Introducing Go by Caleb Doxsey

Author:Caleb Doxsey
Language: eng
Format: epub, pdf
Publisher: O'Reilly Media, Inc.
Published: 2016-01-21T16:00:00+00:00

package main import "fmt" func main() { defer func() { str := recover() fmt.Println(str) }() panic("PANIC") }

A panic generally indicates a programmer error (e.g., attempting to access an index of an array that’s out of bounds, forgetting to initialize a map, etc.) or an exceptional condition that there’s no easy way to recover from (hence the name panic).

Pointers

When we call a function that takes an argument, that argument is copied to the function:

func zero(x int) { x = 0 } func main() { x := 5 zero(x) fmt.Println(x) // x is still 5 }

In this program, the zero function will not modify the original x variable in the main function. But what if we wanted to? One way to do this is to use a special data type known as a pointer:

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