Error handling
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The document discusses error handling in Go. It states that Go uses an error interface type to represent errors, with the interface containing a single Error() method that returns an error message as a string. Errors are often returned as a second argument of a function. Go does not use exceptions like other languages, instead using defer, panic, and recover for error handling. Defer defers a function call, panic signals that code cannot solve a problem and stops execution, and recover can be used to end a panic state and return the panic error value.
Error handling
- 1. Development with Go - Manjitsing K. Valvi
- 2. Error Handling ● Unwanted or unexpected condition occurring in program is ERROR ● E.g. File creation error, DB connection error, out of bound memory access etc. ● Error handling in Golang is unconventional as compared to that of languages like Javascript, Java and Python ● Golang represents errors using the built-in error interface type type error interface { Error() string } ● Interface contains a single method Error() that returns an error message as a string ● The error is often returned as a second argument of the function, making use of multiple value return
- 3. Error Handling ● Go does not have exceptions like many other programming languages ● Go uses “Defer, panic and recover" for error handling ● A defer statement is a mechanism used to defer a function by putting it into an executed stack once the function that contains the defer statement has finished, either normally by executing a return statement or abnormally panicking ● A panic statement signals Golang that your code cannot solve the current problem and it therefore stops the normal execution flow of your code ● Panics can be recovered by calling the built-in recover function within a deferred function in the function that is panicking. Recover will then end the current state of panic and return the panic error value
- 4. References ● “The Go Programming Language ”,Alan A.A.Donovan,Brian W.Kernighan,Addison Wesley Publication