Unit 4. Collections
Collections are just groups of things. You probably have a music collection. Each album has a collection of songs, and each song has a collection of musical notes. If you want to build a music player, you’ll be happy to know that programming languages have collections too.
In Go, you can use the primitive types covered in unit 2 to compose more interesting composite types. These composite types allow you to group values together, providing new ways to collect and access data.
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