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
Marked As Solved
jaywengrow
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.
Popular Pragmatic Bookshelf topics
Other popular topics
Latest in A Common-Sense Guide to Data Structures and Algorithms, Second Edition
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /wasm
- /ruby
- /erlang
- /phoenix
- /keyboards
- /python
- /js
- /rails
- /security
- /go
- /swift
- /vim
- /java
- /clojure
- /emacs
- /haskell
- /typescript
- /svelte
- /onivim
- /kotlin
- /c-plus-plus
- /crystal
- /tailwind
- /react
- /gleam
- /ocaml
- /elm
- /vscode
- /flutter
- /html
- /ash
- /deepseek
- /zig
- /opensuse
- /centos
- /php
- /scala
- /react-native
- /lisp
- /textmate
- /sublime-text
- /nixos
- /debian
- /agda
- /deno
- /django
- /kubuntu
- /arch-linux
- /nodejs
- /ubuntu
- /spring
- /revery
- /manjaro
- /diversity
- /julia
- /lua
- /quarkus
- /markdown
Devtalk Sponsors
Practical resources that improve the lives of professional developers.
We build trusted fault-tolerant systems that scale to billions of users.
Real-time error tracking, performance insights, and observability for devs.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Develop your skills with books, videos, and courses.
Catch errors, track performance, monitor hosts and more.
Enabling companies to succeed by building software people love.
Courses that move you from confusion to "Aha, now I get it!"
Publishing Linux Magazine, ADMIN, and MakerSpace for 25+ years.