Module 2: Data Structures

Arrays, slices, maps, structs, interfaces, generics, and JSON Go's built-in data toolkit.

Topics

#	Topic	Source	Key Concepts
1	Arrays & Slices	src/02_data_structures/01_arrays_slices/main.go	len/cap, append, slice headers, nil vs empty
2	Maps	src/02_data_structures/02_maps/main.go	make, comma-ok, delete, iteration order
3	Structs	src/02_data_structures/03_structs/main.go	Fields, methods, embedding, constructors
4	Interfaces	src/02_data_structures/04_interfaces/main.go	Implicit satisfaction, empty interface, type switch
5	Generics	src/02_data_structures/05_generics/main.go	Type params, constraints, comparable
6	Custom Types	src/02_data_structures/06_custom_types/main.go	Type definitions, method sets, enums via iota
7	JSON Encoding	src/02_data_structures/07_json_encoding/main.go	Marshal/Unmarshal, struct tags, streaming

Run Any Example

go run src/02_data_structures/01_arrays_slices/main.go

What You'll Learn

• Slice internals: pointer + length + capacity
• Maps are unordered never depend on iteration order
• Struct embedding for composition (not inheritance)
• How interfaces enable polymorphism without classes
• Generics (Go 1.18+) for type-safe reusable code