Core Go & Types interview questions

Core Go interview questions are the baseline every interviewer uses to calibrate a Go backend candidate. This module covers the type system from first principles — the distinction between value types (int, struct, array) and reference types (slice, map, channel, pointer), zero values and why Go initialises every variable to a predictable state, pointer semantics including when to use *T vs T for function parameters and receiver methods, constants and the iota counter for enums, type assertions and type switches for working with interface values, and the named return value pattern along with its trade-offs. The blank identifier _ and its uses (discarding values, ensuring interface satisfaction at compile time) appear in real code and in interviews. Every answer explains what the interviewer is actually testing — whether you know that passing a struct by value copies the whole struct and passing a pointer shares state — not just the syntax.