Getting Started: Go Interview Questions

Passing a Go technical interview requires more than just knowing basic syntax; it demands a concrete understanding of the language’s unique mechanics, idioms, and tooling. This course walks you through the exact concepts interviewers expect a junior Go developer to explain, starting with the compilation model, the toolchain, and how packages, modules, and main interact. You will learn the specifics of variable declarations, zero values, and how to use constants and iota. From there, we cover Go’s approach to control flow, including the nuances of the single for loop, range and loopvar semantics, and the behavior of the type switch. We also detail function mechanics, ensuring you can confidently answer questions about multiple and named returns, closures, and the exact execution order of defer, panic, and recover.

As the course progresses, we tackle the core data structures that frequently trip up candidates. You will learn the critical differences between arrays and slices, how the slice header works under the hood, the comma-ok idiom for maps, and the reference semantics of nil slices and maps. We cover string manipulation, explaining bytes, runes, UTF-8, and the strings.Builder toolkit, alongside formatting with fmt and strconv. Next, we explore Go’s approach to types, focusing on structs, value versus pointer receivers, and composition through struct embedding, before moving into interfaces and implicit satisfaction. You will see how to handle the empty interface and any, perform type assertions, and idiomatically manage the error interface using %w, errors.Is, and errors.As. Finally, the course prepares you for concurrency questions by breaking down goroutines, sync.WaitGroup, and channel operations like buffering, closing, and select, wrapping up with state sharing using sync.Mutex and a look at standard library table-driven tests.