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Lazy sequences

Published October 24, 2018

Lazy sequences are a complex issue with a lot of gotchas. I'd like you to understand how they work and know that you could have them passed to your function. Can you handle them?

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Collections vs sequences

When I first was learning Clojure, something was confusing: some operations, like map, took the collection as the last argument, and some, like conj, took the collection as the first argument. It was frustrating. But then I learned that they are in two different categories of functions. Learning that fact helped me be more productive in the language.

Clojure Collections

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Introduction to Clojure's Collections

Data structures

Vector collection

HashMap collection

List collection

Queue collection

Sorted Map collection

Sorted Set collection

Access patterns

Sequential Access Pattern

Remembering Duplicates Access Pattern

Lookup by key Access Pattern

Associate key and value Access Pattern

Dissociate a key and value Access Pattern

Count the elements Access Pattern

Equality Comparison Access Pattern

Removing an item from a set Access Pattern

Splitting a sequence Access Pattern

Containment Check Access Pattern

First-in, first-out Access Pattern

Last-in, First-out Access Pattern

Entity Usage Pattern

Index Usage Pattern

Tuple Usage Pattern

Multi-comparison Usage Pattern

Usage in an Atom

Hybrid Collections

Vectors and Lists in syntax

Collections vs sequences