Go Mastery: The Definitive Golang Guide

Define custom types in Go to give semantic meaning to data, such as username as string. Use var and short declarations to create variables of these types, keeping code clear.

Master Go functions as reusable, modular blocks that accept parameters and return outputs, using the func keyword. Build and test a divide function with error handling for a zero divisor.

Explore building a movie matcher app in Go Mastery, using structs, interfaces, and pointers; implement user creation, a recommendation engine, print user details, and save results to a file.

Define and use Go structs for user and movie, with a custom category type, populate fields, iterate with range to print details, and demonstrate handling unused variables.

Learn to implement robust error handling in Go by returning (value, error), using errors.New for no matching movies, and handling nil errors in the main flow of a recommendation engine.

Test the no-matches edge case in the recommendation function, verifying that a user with preferences receives an error or an empty list when no movies match (e.g., horror).

Explore goroutines, Go's lightweight concurrency threads, and how the go keyword launches URL checks, while the main function waits with a time.sleep hack and introduces a wait group for synchronization.

Leverage goroutines and the sync wait group to replace sleep with a wait, add each check, and wait for all URL checks to finish.

Learn to coordinate goroutines with wait groups and enable inter-goroutine communication using channels, sending and receiving strings between the main and child goroutines.

Utilize buffered channels in Go to allow non-blocking sends and smooth inter-goroutine communication, boosting performance and scalability by buffering messages such as urls and preventing blocking.

Learn to build go cli apps with cobra, defining root and subcommands, using flags, and implementing a log filter that reads and filters logs by level and keyword.