Borys Babusenko Bor1s

LRU Cache — TypeScript

An in-memory cache implementation that expires the least recently used items, and limits cache size by a maximum number of items.

API

A cache object can be instantiated in memory. It requires the max number of records as an argument:

const cache = new Cache<string>({ maxSize: 100 });

#SOLID Principles with ruby examples

##SRP - Single responsibility principle A class should have only a single responsibility.

Every class should have a single responsibility, and that responsibility should be entirely encapsulated. All its services should be narrowly aligned with that responsibility, this embrace the high cohesion.

##OCP - Open/closed principle Software entities should be open for extension, but closed for modification.

Simulate a scanned PDF with ImageMagick

Download and install Ghostscript and ImageMagick + Convert Module
Execute the following command in the console (change the filename)

$ convert -density 200 INPUT.pdf -rotate 0.3 +noise Multiplicative -format pdf  -quality 85 -compress JPEG -colorspace gray OUTPUT.pdf

Description of the options

-density: set the input DPI to 200
-rotate: set Page rotation to 0.3 degrees

First, add pry-rails to your Gemfile:
https://github.com/rweng/pry-rails

gem 'pry-rails', group: :development

Then you'll want to rebuild your Docker container to install the gems

	def key_paths(key, hash_or_string)
	if hash_or_string.is_a?(Hash)
	hash_or_string.keys.map do \|subkey\|
	key_paths([key, subkey].compact.join("."), hash_or_string[subkey])
	end
	else
	key
	end
	end