Hash Maps
Programming Throwdown
The Importance of Hash Maps
The promise of a hash map is insertion and look up being constant time. It doesn't really matter how big your map grows within bounds, you would still get this algorithmic constant time. The challenge with hashing is figuring out sort of the hash function.
In this duo episode, Jason and Patrick introduce us to the world of hash maps, from buckets and hash functions, to differences between open and closed addressing, to minimal perfect hashes and locality sensitive hashing. A familiarity with hash maps is an oft-overlooked but highly sought-after skill, and it can be a valuable asset for those eyeing a career in programming.
Along with the main topic, Jason and Patrick also talk about some of their latest interests: books, gadgets, tools and games.
This episode touches on the following key topics and ideas:
00:01:27 Playing games with Oculus Quest: Acron, Racket: Nx, Gorn, Superhot
00:11:05 News: “I Made a Water Computer” by Steve Mould
00:14:56 colinfurze
00:15:52 News: Comprehensive guide to Attention Mechanisms
00:21:53 News: Starship SN15
00:25:18 News: MailSync now Open source (GPL)
00:28:34 Jason’s Book of the Show: Elon Musk
00:32:04 Patrick’s Book of the Show: Ready Player Two
00:33:40 Jason’s Tool of the Show: Datadog
00:38:44 Patrick’s Tool of the Show: I Expect You to Die
00:40:30 Escape rooms
00:45:39 Sudoku
00:48:35 Hash maps: the promise and idea
00:50:59 Hash Functions
00:52:34 Examples of hash functions: Cryptographically Secure and Non-Crypto
01:01:05 Load Factors
01:03:43 Open vs Closed Addressing
01:15:10 Minimal Perfect Hash
01:16:25 salts
01:19:00 Locality Sensitive Hashing
Resources mentioned in this episode:
Tools
- Mailsync http://mailsync.sourceforge.net/
- Mailspring https://getmailspring.com/
- Datadog https://www.datadoghq.com/
- SHA https://en.wikipedia.org/wiki/Secure_Hash_Algorithms
- MD5 https://en.wikipedia.org/wiki/MD5
- MurmurHash https://github.com/aappleby/smhashera
- xxHash https://cyan4973.github.io/xxHash/
- MapReduce https://www.ibm.com/analytics/hadoop/mapreduce
Books
- Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future by Ashlee Vance
- Ready Player Two by Ernest Cline
Gadgets
- Oculus Quest 2 https://www.oculus.com/quest-2/
- Oculus Link https://www.oculus.com/accessories/oculus-link/
Games
- Acron: Attack of the Squirrels! https://www.resolutiongames.com/acron
- Racket: Nx https://www.oculus.com/experiences/quest/2255408847836468
- Gorn https://www.oculus.com/experiences/quest/3349689215139117
- Superhot https://www.oculus.com/experiences/quest/1921533091289407
- I Expect You to Die https://www.oculus.com/experiences/quest/1987283631365460
- The Legend of Zelda: Breath of the WIld https://www.zelda.com/breath-of-the-wild/
Videos:
- I Made A Water Computer And It Actually Works https://www.youtube.com/watch?v=IxXaizglscw
- colinfurze YouTube channel https://www.youtube.com/user/colinfurze
Articles:
- Comprehensive guide to Attention Mechanisms https://www.analyticsvidhya.com/blog/2019/11/comprehensive-guide-attention-mechanism-deep-learning/
- Starship SN15 https://www.space.com/spacex-starship-sn15-launch-landing-success
- MailSync is now Open Source (GPL) https://community.getmailspring.com/t/a-free-open-source-future-for-mailspring/484
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