Function Composition in Ruby
Along with a number of other cool new features and performance improvements, Ruby 2.6 added function composition to the Proc and Method classes. Today we’ll take a look at how this allows us to use some functional programming goodness in our Ruby code.
Related cards:
edgecase's ruby_koans at master - GitHub
The Ruby Koans walk you along the path to enlightenment in order to learn Ruby. The goal is to learn the Ruby language, syntax, structure, and some common functions and libraries. We also teach you culture. Testing is not just something we pay lip...
James on Software | Introducing Trample: A Better Load Simulator
Trample is a more flexible load simulator. Instead of a static list of urls, trample's configuration language is ruby. Using ruby's blocks (lambda functions), it's possible to randomize the requests that get made in each thread, as well as the use...
How to: Fix json 1.8.3 with Ruby 2.5
The gem json fails to install for Ruby 2.5 if you use a version equal or below 1.8.3.
Run bundle update json --conservative to solve this issue.
The backtrace you will encounter looks like this:
Building native extensions. This coul...
JavaScript: Calling a function with a variable number of arguments
This card describes how to pass an array with multiple element to a JavaScript function, so that the first array element becomes the first function argument, the second element becomes the second argument, etc.
Note how this is different from pas...
Ruby: Using the pry debugger in projects with older Ruby versions
In case you want to use pry with an older version of Ruby, you can try the following configurations.
Ruby 1.8.7
Your pry version must not be greater than 0.9.10.
gem 'pry', '=0.9.10'
gem 'ruby-debug',...
.rvmrc deprecated in favor of .ruby-version and .ruby-gemset
Do not use .rvmrc files to specify Ruby version and gemset configuration any longer, it's deprecated and not considered by other Ruby version managers such as rbenv.
If you want to migrate an existing .rvmrc you can use `rvm rvmrc to .ruby-ve...
Installing Ruby 2.3 or below on Ubuntu 17 and above
From Ubuntu 17, rbenv fails to install Ruby below 2.4 because of a mismatching OpenSSL dependency: it needs libssl1.0-dev for the installation process, but recent Ubuntus come with libssl-dev.
From the linked StackOverflow comment:
As fa...
Ruby bug: Symbolized Strings Break Keyword Arguments in Ruby 2.2
TL;DR Under certain circumstances, dynamically defined symbols may break keyword arguments in Ruby 2.2. This was fixed in Ruby 2.2.3 and 2.3.
Specifically, when …
- there is a method with several keyword arguments and a double-splat a...
List of handy Ruby scripts to transcode different file types (often by using GPT)
It's 2024 and we have tools like ffmpeg, imagemagick and GPT readily available. With them, it's easy to convert texts, images, audio and video clips into each other.
For the everyday use without any parameter tweaking I'm using a collection of ti...