Index Usage Pattern

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Index Usage Pattern

Course: Clojure Collections

Updated October 24, 2018

We look at another usage pattern for HashMaps. This one is for looking things up based on a key. We look at three variations on it.

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21 min

Tuple Usage Pattern

We look at another typical usage pattern. This one uses Vectors to hold bits of data together. It's a replacement for Entities (which use a HashMap), but it has a lot of limitations, which we go over. WE talk about the Variant Tuple variation.

Course: Clojure Collections

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Lessons

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