Data Structures & Types

How Go organizes data -- from built-in collections (slices, maps) through custom types (structs, interfaces) to advanced type features (generics, embedding). This section covers Go's approach to polymorphism and code reuse without classes or inheritance.

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#	Topic	What You'll Learn	Level
1	Arrays & Slices	Slice header (ptr, len, cap), append, shared arrays, pre-allocation	Beginner
2	Maps	Hash maps, comma-ok idiom, nil vs empty, not concurrent-safe	Beginner
3	Structs	Fields, tags, constructors, anonymous structs, JSON mapping	Beginner
4	Interfaces & Polymorphism	Implicit satisfaction, empty interface, composition, nil trap	Intermediate
5	Methods & Receivers	Value vs pointer receivers, method sets, interface satisfaction	Intermediate
6	Embedding & Composition	Go's alternative to inheritance, promoted methods, shadowing	Intermediate
7	Type Assertions & Switches	Runtime type checking, safe assertions, extracting behavior	Intermediate
8	Generics	Type parameters, constraints, comparable, when to use generics	Advanced

Interview Quick Hits

• Slices are reference types backed by arrays -- understand the slice header struct
• Maps have random iteration order and are not safe for concurrent use
• Interfaces are satisfied implicitly -- no implements keyword
• "Accept interfaces, return structs" is a key Go design proverb
• Method sets determine interface satisfaction: pointer receivers are NOT in the value method set