Mark

Title: A Common-Sense Guide to Data Structures and Algorithms, Second Edition Example: JavaScript == (page 91)

On page 91, there’s an example of an array intersection function that uses a double equals in its comparison line:

if (firstArray[i] == secondArray[j]) {

The code works, but using == in JavaScript was the cause of many difficult to debug errors and has been generally frowned upon for the past decade, with the occasional exception of using it to catch both undefined and null values.

Some linters completely prohibit == comparisons, so I’d suggest changing the line to use ===.

#book-a-common-sense-guide-to-data-structures-and-algorithms-second-edition

1 comment

#errata /book-a-common-sense-guide-to-data-structures-and-algorithms-second-edition

3 888 1

2021-01-11 21:55:48 UTC

Marked As Solved

jaywengrow

Author of A Common-Sense Guide to Data Structures and Algorithms

Nice catch, thank you! I’ve used triple-equals elsewhere, but I seemed to have missed it here. We’ll get this fixed in the next reprint.

Post #2

Where Next?

View thread on forum

View A Common Sense Guide To Data Structures And Algorithms Second Edition's book portal

Post errata for this book

Post a suggestion for this book

Post a question about this book

Post a review about this book

Home PragProg Customers

#errata /book-a-common-sense-guide-to-data-structures-and-algorithms-second-edition

3 888 1

Last post

Popular Pragmatic Bookshelf topics

PragProg Customers

Distributed Services With Go - Agent_test.go error line 77

This test is broken right out of the box… — FAIL: TestAgent (7.82s) agent_test.go:77: Error Trace: agent_test.go:77 agent_test.go:...

#errata /book-distributed-services-with-go

4 1549 7

2020-06-26 06:50:51 UTC

New

PragProg Customers

Effective Testing with RSpec 3: Running Sequel migrations fails (page 84)

Following the steps described in Chapter 6 of the book, I’m stuck with running the migration as described on page 84: bundle exec sequel...

#errata /book-effective-testing-with-rspec-3

4 1152 1

2020-07-16 15:18:25 UTC

New

PragProg Customers

Programming Machine Learning: Incorrect formula

Hi everyone! There is an error on the page 71 in the book “Programming machine learning from coding to depp learning” P. Perrotta. You c...

#errata /book-programming-machine-learning

5 1335 4

2022-04-06 12:03:54 UTC

New

PragProg Customers

Programming Kotlin: Difference between SupervisorJob() and supervisorScope (324, 325)

Hi @venkats, It has been mentioned in the description of ‘Supervisory Job’ title that 2 things as mentioned below result in the same eff...

#question /book-programming-kotlin

0 2233 2

2021-03-16 11:28:51 UTC

New

PragProg Customers

Programming Phoenix LiveView: P27, live_path confusion

I am working on the “Your Turn” for chapter one and building out the restart button talked about on page 27. It recommends looking into ...

#question /book-programming-phoenix-liveview

7 3492 14

2023-08-09 13:36:28 UTC

New

PragProg Customers

Intuitive Python: docker run… denied error (page 2)

Title: Intuitive Python: docker run… denied error (page 2) Attempted to run the docker command in both CLI and Powershell PS C:\Users\r...

#errata /book-intuitive-python

9 1256 4

2021-04-06 16:33:24 UTC

New

PragProg Customers

A Common-Sense Guide to Data Structures and Algorithms, Second Edition: (pg460)

Hello! Thanks for the great book. I was attempting the Trie (chap 17) exercises and for number 4 the solution provided for the autocorre...

#errata /book-a-common-sense-guide-to-data-structures-and-algorithms-second-edition

0 1152 3

2023-03-10 05:02:03 UTC

New

PragProg Customers

Build a Weather Station with Elixir and Nerves: SGP30 vs SGP40

This is as much a suggestion as a question, as a note for others. Locally the SGP30 wasn’t available, so I ordered a SGP40. On page 53, ...

#suggestion /book-build-a-weather-station-with-elixir-and-nerves

0 1288 2

2024-03-20 19:56:42 UTC

New

PragProg Customers

Programming Phoenix LiveView: PentoWeb.LayoutView errata (56)

root_layout: {PentoWeb.LayoutView, :root}, This results in the following following error: no “root” html template defined for PentoWeb...

#errata /book-programming-phoenix-liveview

8 1090 4

2023-10-22 17:25:26 UTC

New

PragProg Customers

Kotlin and Android Development featuring Jetpack: No activity_main.xml anymore

I just bought this book to learn about Android development, and I’m already running into a major issue in Ch. 1, p. 20: “Update activity...

#errata /book-kotlin-and-android-development-featuring-jetpack

0 2120 6

2023-08-15 06:19:56 UTC

New

Other popular topics

General Dev>Hardware

Which keyboard do you have?

If it’s a mechanical keyboard, which switches do you have? Would you recommend it? Why? What will your next keyboard be? Pics always w...

#hardware /keyboards #sticky #mechanical-keyboards

144 8820 50

2021-01-07 23:58:36 UTC

New

Backend>Learning Resources

Testing Elixir

Write Elixir tests that you can be proud of. Dive into Elixir’s test philosophy and gain mastery over the terminology and concepts that u...

pragprog.com

#pragprog /elixir #published-book /book-testing-elixir

33 3731 8

2021-01-05 06:17:50 UTC

New

Science/Tech>Tech Chat

Games! Which do you play?

Which, if any, games do you play? On what platform? I just bought (and completed) Minecraft Dungeons for my Nintendo Switch. Other than ...

#games

246 5882 101

2024-08-22 11:09:29 UTC

New

General Dev>Code Editors

SpaceVim vs SpaceMacs

SpaceVim seems to be gaining in features and popularity and I just wondered how it compares with SpaceMacs in 2020 - anyone have any thou...

/vim #spacevim #spacemacs /emacs #code-editors

30 3990 14

2020-08-27 17:53:29 UTC

New

General Dev>Hardware

Moonlander Keyboard (Mechanical) (Ergonomic) (Split) (Ortholinear)

Bought the Moonlander mechanical keyboard. Cherry Brown MX switches. Arms and wrists have been hurting enough that it’s time I did someth...

#hardware /keyboards #moonlander #mechanical-keyboards #ortholinear #ergonomic

212 16447 90

2021-07-13 15:33:55 UTC

New

General Dev>Hardware

BIIP MT3 Extended 2048 Custom Keycap Set (Drop)

This looks like a stunning keycap set :orange_heart: A LEGENDARY KEYBOARD LIVES ON When you bought an Apple Macintosh computer in the e...

/keyboards #apple #keycaps #mechanical-keyboards

14 6365 7

2020-12-12 19:58:26 UTC

New

macOS>Chat

My thoughts on macOS vs Linux

Small essay with thoughts on macOS vs. Linux: I know @Exadra37 is just waiting around the corner to scream at me “I TOLD YOU SO!!!” but I...

#macos #linux

166 8678 69

2021-04-10 22:36:29 UTC

New

Backend>Chat

How to install Ruby 3 with ASDF

In case anyone else is wondering why Ruby 3 doesn’t show when you do asdf list-all ruby :man_facepalming: do this first: asdf plugin-upd...

/ruby #asdf

11 5679 4

2021-02-02 08:02:13 UTC

New

Backend>Chat

Data Structures and Algorithms with Elixir

This is going to be a long an frequently posted thread. While talking to a friend of mine who has taken data structure and algorithm cou...

/elixir #algorithms #data-structures

108 10628 31

2024-11-14 02:14:00 UTC

New

Backend>Official News

Node.js v22.14.0 released!

Node.js v22.14.0 has been released. Link: Release 2025-02-11, Version 22.14.0 'Jod' (LTS), @aduh95 · nodejs/node · GitHub

github.com

/nodejs #official-news

0 2585 0

2025-02-11 15:30:14 UTC

New

Title: A Common-Sense Guide to Data Structures and Algorithms, Second Edition Example: JavaScript == (page 91)

Mark

Title: A Common-Sense Guide to Data Structures and Algorithms, Second Edition Example: JavaScript == (page 91)