August 2020
Intermediate to advanced
508 pages
11h 53m
English
book
A Common-Sense Guide to Data Structures and Algorithms, Second Edition, 2nd Edition
by Jay Wengrow
Content preview from A Common-Sense Guide to Data Structures and Algorithms, Second Edition, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Hashing with Hash Functions
Do you remember those secret codes you used as a kid to create and decipher messages?
For example, here’s a simple way to map letters to numbers:
A = 1 B = 2 C = 3 D = 4 E = 5
and so on.
According to this code,
ACE converts to 135, CAB converts to 312, DAB converts to 412,
and
BAD converts to 214.
This process of taking characters and converting them to numbers is known as hashing. And the code that is used to convert those letters into particular numbers is called a hash function.
There are many other hash functions besides this one. Another example of a hash function may be to take each letter’s corresponding number and return the sum of all the numbers. If we did that, BAD would become the number 7 following a ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.