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Index Usage Pattern
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Index Usage Pattern

Updated October 24, 2018

Code

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.

Code is available: lispcast/clojure-collections

You can checkout the code in your local repo with this command:

$CMD git clone https://github.com/lispcast/clojure-collections.git 
$CMD cd clojure-collections

Next Lesson:

Tuple Usage Pattern

21 min

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.

Clojure Collections

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Introduction to Clojure's Collections
 
5 min 
 
Data structures
 
8 min 
 
Vector collection
 
24 min 
 
HashMap collection
 
30 min 
 
Set collection
 
19 min 
 
List collection
 
12 min 
 
Queue collection
 
11 min 
 
Sorted Map collection
 
11 min 
 
Sorted Set collection
 
7 min 
 
Access patterns
 
8 min 
 
Sequential Access Pattern
 
26 min 
 
Remembering Duplicates Access Pattern
 
16 min 
 
Lookup by key Access Pattern
 
12 min 
 
Associate key and value Access Pattern
 
19 min 
 
Dissociate a key and value Access Pattern
 
4 min 
 
Count the elements Access Pattern
 
6 min 
 
Equality Comparison Access Pattern
 
12 min 
 
Removing an item from a set Access Pattern
 
8 min 
 
Splitting a sequence Access Pattern
 
8 min 
 
Containment Check Access Pattern
 
9 min 
 
First-in, first-out Access Pattern
 
12 min 
 
Last-in, First-out Access Pattern
 
6 min 
 
Usage patterns
 
2 min 
 
Entity Usage Pattern
 
17 min 
 
Index Usage Pattern
 
18 min 
 
Tuple Usage Pattern
 
21 min 
 
Multi-comparison Usage Pattern
 
11 min 
 
Transients
 
11 min 
 
Usage in an Atom
 
17 min 
 
Hybrid Collections
 
11 min 
 
Hybrid Types
 
27 min 
 
Vectors and Lists in syntax
 
6 min 
 
Lazy sequences
 
5 min 
 
Collections vs sequences
 
14 min