Chanaka Abeysinghe chanakasan

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Dependency Injection in Ruby 07 Oct 04

Introduction

At the 2004 Ruby Conference, Jamis Buck had the unenviable task to explain Dependency Injection to a bunch of Ruby developers. First of all, Dependency Injection (DI) and Inversion of Control (IoC) is hard to explain, the benefits are subtle and the dynamic nature of Ruby make those benefits even more marginal. Furthermore examples using DI/IoC are either too simple (and don’t convey the usefulness) or too complex (and difficult to explain in the space of an article or presentation). I once attempted to explain DI/IoC to a room of Java programmers (see onestepback.org/articles/dependencyinjection/), so I can’t pass up trying to explain it to Ruby developers.

Thanks goes to Jamis Buck (the author of the Copland DI/IoC framework) who took the time to review this article and provide feedback.

What is Dependency Injection?

Multiple PHP versions using `phpenv` and `php-build`

Install dependecies

Debian/Ubuntu users

sudo apt install \
  autoconf \
  bison \

react-boilerplate-1

react_component_lifecycle_example

Stored format

Qty over	Unit price
0	30
5	20
8	10

Display format

Quantity	Unit price (each)

	# frozen_string_literal: true

	module ComponentHelper
	def component(name, , *, &)
	component_name = "#{name}_component".split('__').map(&:classify).join('::')
	render(component_name.constantize.new(, *), &)
	end

	def component_alt(name, , *, &)
	component_name = "#{name}__component".split('__').map(&:classify).join('::')

	#!/usr/bin/env osascript -l JavaScript

	/**
	* A JXA script to list all the fullscreen windows.
	* Note: In macOS Mojave this method lists all the maximized windows as well.
	* So we don't know which ones are fullscreen.
	*/

	ObjC.import('CoreGraphics');

	cd ~
	git clone [email protected]:vim/vim.git
	cd vim

	./configure --with-features=huge \
	--disable-acl \
	--disable-cscope \
	--disable-netbeans \
	--enable-gui=auto \
	--enable-luainterp \

	// app/javascript/controllers/index.js

	import PopperController from "./popper_controller"
	application.register("popper", PopperController)