
joustava
Genetic Algorithms in Elixir: Chapter 6: Misplaced parenthesis in fitness_function (page 90)
Seems that in the line:
|> Kernel.-(Enum.at(chromosome.genes), j)
the closing parens (after genes) is misplaced.
should probably be
|> Kernel.-(Enum.at(chromosome.genes, j))
Otherwise we get a
** (UndefinedFunctionError) function Enum.at/1 is undefined or private. Did you mean one of:
* at/2
* at/3
(elixir 1.10.3) Enum.at([3, 7, 5, 2, 1, 0, 6, 4])
scripts/n_queens.exs:21: anonymous fn/4 in NQueens.fitness_function/1
Popular Pragmatic Bookshelf topics

Python Testing With Pytest - Chapter 2, warnings for “unregistered custom marks”
While running the smoke tests in Chapter 2, I get these...
New

Title: Web Development with Clojure, Third Edition, pg 116
Hi - I just started chapter 5 and I am stuck on page 116 while trying to star...
New

Title: Web Development with Clojure, Third Edition - migrations/create not working: p159
When I execute the command:
user=> (create-...
New

When I try the command to create a pair of migration files I get an error.
user=> (create-migration "guestbook")
Execution error (Ill...
New

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 ...
New

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...
New

I’m not quite sure what’s going on here, but I’m unable to have to containers successfully complete the Readiness/Liveness checks. I’m im...
New

Hi, I’ve got a question about the implementation of PubSub when using a Phoenix.Socket.Transport behaviour rather than channels.
Before ...
New

Book: Programming Phoenix LiveView, page 142 (157/378), file lib/pento_web/live/product_live/form_component.ex, in the function below:
d...
New

Modern front-end development for Rails, second edition - Struggling to get the first chapter to work
After running /bin/setup, the first error was: The foreman' command exists in these Ruby versions: That was easy to fix: gem install fore...
New
Other popular topics

Rust is an exciting new programming language combining the power of C with memory safety, fearless concurrency, and productivity boosters...
New

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...
New

Oh just spent so much time on this to discover now that RancherOS is in end of life but Rancher is refusing to mark the Github repo as su...
New

Think Again 50% Off Sale »
The theme of this sale is new perspectives on familiar topics.
Enter coupon code ThinkAgain2021 at checkout t...
New

Hello everyone! This thread is to tell you about what authors from The Pragmatic Bookshelf are writing on Medium.
New

Here’s the story how one of the world’s first production deployments of LiveView came to be - and how trying to improve it almost caused ...
New

API 4
Path:
/user/following/
Method:
GET
Description:
Returns the list of all names of people whom the user follows
Response
[
{ ...
New

We’ve talked about his book briefly here but it is quickly becoming obsolete - so he’s decided to create a series of 7 podcasts, the firs...
New

Author Spotlight
Erin Dees
@undees
Welcome to our new author spotlight! We had the pleasure of chatting with Erin Dees, co-author of ...
New

I’m able to do the “artistic” part of game-development; character designing/modeling, music, environment modeling, etc.
However, I don’t...
New
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /wasm
- /ruby
- /erlang
- /phoenix
- /keyboards
- /rails
- /js
- /python
- /security
- /go
- /swift
- /vim
- /clojure
- /java
- /haskell
- /emacs
- /svelte
- /onivim
- /typescript
- /crystal
- /c-plus-plus
- /tailwind
- /kotlin
- /gleam
- /react
- /flutter
- /elm
- /ocaml
- /ash
- /vscode
- /opensuse
- /centos
- /php
- /deepseek
- /scala
- /html
- /zig
- /debian
- /nixos
- /lisp
- /agda
- /sublime-text
- /react-native
- /textmate
- /kubuntu
- /arch-linux
- /revery
- /ubuntu
- /manjaro
- /spring
- /django
- /diversity
- /nodejs
- /lua
- /c
- /slackware
- /julia
- /neovim