BernardK
Programming Ruby 3.2 (5th Edition): B2.0 page 381, 'cat'.methods --> 'dog'.methods
Already in the previous edition !
page 381, second code, second of the four puts : animal is a dog, not a cat
puts "It defines methods #{singleton.instance_methods - 'cat'.methods}"
Even if it doesn’t change the result, it should be one of :
puts "It defines methods #{singleton.instance_methods - 'dog'.methods}"
puts %Q(It defines methods #{singleton.instance_methods - "dog".methods})
First Post!
noelrappin
Hmm… I think the point here is that it’s the singleton methods minus the string instance methods so, 'cat'.methods is confusing, but I think it actually works. It probably should be animal.methods, though.
Popular Pragmatic Bookshelf topics
Other popular topics
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /wasm
- /ruby
- /erlang
- /phoenix
- /keyboards
- /python
- /js
- /rails
- /security
- /go
- /swift
- /vim
- /clojure
- /emacs
- /haskell
- /java
- /svelte
- /onivim
- /typescript
- /kotlin
- /c-plus-plus
- /crystal
- /tailwind
- /react
- /gleam
- /ocaml
- /flutter
- /elm
- /vscode
- /ash
- /html
- /opensuse
- /zig
- /deepseek
- /centos
- /php
- /scala
- /react-native
- /lisp
- /textmate
- /sublime-text
- /nixos
- /debian
- /agda
- /django
- /deno
- /kubuntu
- /arch-linux
- /nodejs
- /revery
- /ubuntu
- /spring
- /manjaro
- /diversity
- /lua
- /julia
- /markdown
- /c
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!"