Handling Errors in Golang: A Comprehensive Challenge

Introduction

The purpose of this challenge is to understand how to handle errors in Golang.

Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL go(("`Go`")) -.-> go/ErrorHandlingGroup(["`Error Handling`"]) go/ErrorHandlingGroup -.-> go/errors("`Errors`") subgraph Lab Skills go/errors -.-> lab-15392{{"`Handling Errors in Golang (Challenge)`"}} end

Errors

The challenge provides two functions that return an error if the input argument is 42. The first function returns a basic error value, while the second function uses a custom type to represent the error.

Requirements

The errors package must be imported.
The f1 function must return an error if the input argument is 42.
The f2 function must return an error of type argError if the input argument is 42.
The argError type must have two fields: arg and prob.
The argError type must implement the Error() method.
The main function must call both f1 and f2 with input arguments of 7 and 42.
The main function must print the result of each function call, along with any error that was returned.
The main function must demonstrate how to programmatically use the data in a custom error.

Example

$ go run errors.go
f1 worked: 10
f1 failed: can't work with 42
f2 worked: 10
f2 failed: 42 - can't work with it
42
can't work with it

## See this [great post](https://go.dev/blog/error-handling-and-go)
## on the Go blog for more on error handling.

Summary

This challenge demonstrates how to handle errors in Golang using the error interface and custom error types. It also shows how to programmatically use the data in a custom error.

Handling Errors in Golang (Challenge)