Functions & Interfaces

Go composes programs with functions, methods, and interfaces, not inheritance. Learn how Go attaches behavior to data and uses narrow interfaces.

Learn Go functions, methods, and interfaces with 10 practical examples. Understand multiple returns, value receivers, and error handling.

Learn how Go functions return multiple values, name results, and use naked returns. Understand when to use named returns for clarity or avoid them.

Learn how Go variadic functions accept multiple arguments and function types enable higher-order functions for flexible, reusable code.

Learn the differences between value and pointer receivers in Go, including how they affect mutability, method sets, and API design.

Learn about Go function literals and closures, including how they capture variables, common goroutine closure traps, and factory patterns.

Learn how Go interfaces define behavior through method sets. Understand implicit satisfaction, small interfaces, and accepting interfaces in function parameters.

Design idiomatic Go functions, methods, and interfaces for readable, maintainable APIs. Learn best practices for error handling, contexts, and receiver types.

A single-page roundup of every highlight bullet from the 9 pages in the Functions & Interfaces section, grouped by source page so you can scan all 54 takeaways without opening each article individually.