Red

Rust Brain Teasers: Doubling the right value (page 69?)

The page number is absent for the “card” pages unfortunately, but it’s before page 70.

println!("2 * 4 = {}", double_it(2));

should be

println!("2 * 4 = {}", double_it(4));

It won’t change the outcome, but I’d put a “4” at least just for the sake of clarity.

5 comments

#errata /book-rust-brain-teasers

0 579 5

2022-08-05 14:10:32 UTC

First Post!

Red

I must admit that missing features like overloading and default parameters requires some boilerplate code sometimes, it’s sad. Hopefully they’ll get around to providing that in a distant future but it seems to require a tremendous amount of discussion before reaching any decision.

In comparison, Kotlin has its development started slightly later by a small team (at Jetbrains) and is now much more flexible. It also includes more libraries, for which Rust must rely on external crates (and are for the most part yet in beta stage…).

Those are the little drawbacks of this otherwise awesome language.

Post #2

Where Next?

View thread on forum

View Rust Brain Teasers'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-rust-brain-teasers

0 579 5

Last post

Popular Pragmatic Bookshelf topics

PragProg Customers

Python Testing with pytest - Chapter 5 example c AttributeError: 'module' object has no attribute 'config'

Running the examples in chapter 5 c under pytest 5.4.1 causes an AttributeError: ‘module’ object has no attribute ‘config’. In particula...

#errata /book-python-testing-with-pytest

5 3582 1

2020-07-14 20:43:55 UTC

New

PragProg Customers

Modern Front-End Development for Rails: B7 no main folder in the source code (page xv)

On the page xv there is an instruction to run bin/setup from the main folder. I downloaded the source code today (12/03/21) and can’t see...

#errata /book-modern-front-end-development-for-rails

2 1452 11

2022-03-08 17:27:57 UTC

New

PragProg Customers

Programming Phoenix LiveView: errata and remarks Version B2.0

The generated iex result below should list products instead of product for the metadata. (page 67) iex> product = %Product{} %Pento....

#errata /book-programming-phoenix-liveview

0 1800 20

2021-03-23 10:33:03 UTC

New

PragProg Customers

A Common-Sense Guide to Data Structures and Algorithms, Second Edition: erroneous extra space complexity (page400)

A Common-Sense Guide to Data Structures and Algorithms, Second Edition by Jay Wengrow @jaywengrow Hi, I have the paperback version of t...

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

4 1180 2

2021-07-27 21:37:42 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition: cards pip install error (page 12)

#book-python-testing-with-pytest-second-edition Hi. Thanks for writing the book. I am just learning so this might just of been an issue ...

#errata /book-python-testing-with-pytest-second-edition

4 1191 3

2021-07-03 13:40:39 UTC

New

PragProg Customers

Build a Weather Station with Elixir and Nerves: 'mix deps.get' does not work if user has not created a keyfile (page 16)

Running mix deps.get in the sensor_hub directory fails with the following error: ** (Mix) No SSH public keys found in ~/.ssh. An ssh aut...

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

2 1457 3

2024-12-18 18:02:25 UTC

New

PragProg Customers

Kotlin and Android Development featuring Jetpack: Error in generated Game.java (page 136)

I’m under the impression that when the reader gets to page 136 (“View Data with the Database Inspector”), the code SHOULD be able to buil...

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

2 1172 8

2021-09-17 18:06:54 UTC

New

PragProg Customers

Agile Web Development with Rails 7: (page 70)

Title: Agile Web Development with Rails 7: (page 70) I am running windows 11 pro with rails 7.0.3 and ruby 3.1.2p20 (2022-04-12 revision...

#question /book-agile-web-development-with-rails-7

0 1129 1

2022-06-08 13:17:16 UTC

New

PragProg Customers

Docker for Rails Developers - 'docker-machine' command deprecated (page 156)

Docker-Machine became part of the Docker Toolbox, which was deprecated in 2020, long after Docker Desktop supported Docker Engine nativel...

/book-docker-for-rails-developers #suggestion

0 896 0

2023-03-06 18:01:33 UTC

New

PragProg Customers

SQL Antipatterns, Volume 1: Volume 2?

Is there any plan for volume 2? :slight_smile:

#question /book-sql-antipatterns-volume-1

4 673 3

2025-02-14 19:17:40 UTC

New

Other popular topics

Game Dev>Learning Resources

The Ray Tracer Challenge

Brace yourself for a fun challenge: build a photorealistic 3D renderer from scratch! In just a couple of weeks, build a ray tracer that r...

pragprog.com

#pragprog #published-book /book-the-ray-tracer-challenge #algorithms

3 6115 0

2020-09-22 14:26:56 UTC

New

General Dev>Dev Chat

Which vertical monitor do you use?

I’m thinking of buying a monitor that I can rotate to use as a vertical monitor? Also, I want to know if someone is using it for program...

#monitors #programming

51 4892 20

2023-06-28 07:23:42 UTC

New

Backend>Questions

Can someone explain the -t option/flag in docker run command?

I know that -t flag is used along with -i flag for getting an interactive shell. But I cannot digest what the man page for docker run com...

#docker

7 10261 2

2020-09-01 07:19:16 UTC

New

General Dev>Hardware

Custom keyboard keycaps

There’s a whole world of custom keycaps out there that I didn’t know existed! Check out all of our Keycaps threads here: https://forum....

#hardware /keyboards #keycaps #mechanical-keyboards

15 11086 19

2023-07-27 16:30:57 UTC

New

General Dev>Hardware

Keyboard thock (sound)

I’ve been hearing quite a lot of comments relating to the sound of a keyboard, with one of the most desirable of these called ‘thock’, he...

/keyboards #mechanical-keyboards

14 11197 8

2020-11-11 11:59:23 UTC

New

General Dev>Dev Chat

How fast do you type? Check your WPM here!

Do the test and post your score :nerd_face: :keyboard: If possible, please add info such as the keyboard you’re using, the layout (Qw...

typing-speed-test.aoeu.eu

/keyboards

82 7682 31

2021-07-10 05:52:20 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 9730 69

2021-04-10 22:36:29 UTC

New

Backend>Learning Resources

Programming Phoenix LiveView

Build highly interactive applications without ever leaving Elixir, the way the experts do. Let LiveView take care of performance, scalabi...

pragprog.com

#pragprog /elixir /phoenix #published-book /book-programming-phoenix-liveview

79 10732 24

2026-02-13 05:37:02 UTC

New

Windows>Chat

Taskbar Overflow Menu (NOT System Tray Overflow)

There appears to have been an update that has changed the terminology for what has previously been known as the Taskbar Overflow - this h...

#taskbar-overflow-win-11

3 3715 2

2023-02-13 08:43:55 UTC

New

Backend>Questions

Psql: error: connection to server on socket "/tmp/.s.PGSQL.5432" failed: No such file or directory

If you’re getting errors like this: psql: error: connection to server on socket “/tmp/.s.PGSQL.5432” failed: No such file or directory ...

#macos /rails /postgresql

1 5553 1

2024-10-17 02:03:48 UTC

New

Rust Brain Teasers: Doubling the right value (page 69?)

Red

Rust Brain Teasers: Doubling the right value (page 69?)

First Post!

Red

Where Next?

Popular Pragmatic Bookshelf topics

Python Testing with pytest - Chapter 5 example c AttributeError: 'module' object has no attribute 'config'

Modern Front-End Development for Rails: B7 no main folder in the source code (page xv)

Programming Phoenix LiveView: errata and remarks Version B2.0

A Common-Sense Guide to Data Structures and Algorithms, Second Edition: erroneous extra space complexity (page400)

Python Testing with pytest, Second Edition: cards pip install error (page 12)

Build a Weather Station with Elixir and Nerves: 'mix deps.get' does not work if user has not created a keyfile (page 16)

Kotlin and Android Development featuring Jetpack: Error in generated Game.java (page 136)

Agile Web Development with Rails 7: (page 70)