linkjobai / Object-Oriented Design Interview: Parking Lot

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Interview prep notes

interview

Object-Oriented Design Interview: Parking Lot

"Design a parking lot" is the most common object-oriented design (OOD) question. The interviewer is checking whether you can turn vague requirements into clean classes and responsibilities, not whether you know a single right answer.

Clarify first

Multiple floors? Spot sizes (motorcycle, compact, large, EV charging)?
Entry and exit gates, tickets, payment (hourly rate, flat fee)?
Should it show free spots per floor on a display board?

gaiety / test_cleanup.exs

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elixir

1	describe "my awesome testing describe" do
2	setup do
3	starting_value = Application.get_env(:cool, :beans)
4
5	on_exit(fn ->
6	Application.put_env(:cool, :beans, starting_value)
7	end)
8	end
9	end

gaiety / update_with_from_join.sql

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https://neon.com/postgresql/postgresql-tutorial/postgresql-update-join

sql

1	UPDATE table1
2	SET table1.c1 = new_value
3	FROM table2
4	WHERE table1.c2 = table2.c2;

gaiety / Git Alias - Merge latest main

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Git Alias to Merge Main into Current Branch

alias git

1	[alias]
2	update = "!update() { git fetch && git merge main --no-edit; }; update"

gaiety / run_script_once.sh

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1	if [ ! -f ~/.script_has_run ]; do sh ~/script_has_run.sh && touch ~/.script_has_run; done

gaiety / Simple nginx static site docker compose

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No build steps or anything fancy, easy to throw into a static project

docker nginx

1	name: nginx-static-site
2	services:
3	client:
4	image: nginx
5	ports:
6	- 80:80
7	volumes:
8	- ./:/usr/share/nginx/html

gaiety / dotfiles-link.sh

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Links need to be absolute, which is hard when you don't know where a git repo will be cloned to. This helps with that!

bash link script shell

1	# Link current directory instead of having to always do absolute
2	ln -s "$(pwd)/cool-tool" ~/.config/cool-tool

gaiety / ecto-migration-search-pg_trgm

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ecto postgres search

1	defmodule MyProject.Repo.Migrations.ItemsSearch do
2	use Ecto.Migration
3
4	def up do
5	execute "CREATE EXTENSION IF NOT EXISTS pg_trgm;"
6
7	execute """
8	CREATE INDEX items_search_index
9	ON items
10	USING gin ((name) gin_trgm_ops);

gaiety / ecto-get-random.ex

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1	def get_random_items(limit \\ 3) do
2	query =
3	from Item,
4	order_by: fragment("RANDOM()"),
5	limit: ^limit,

gaiety / ecto-search-simple-word-similarity.ex

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ecto elixir phoenix search

1	defp items_search(search) do
2	dynamic(
3	[item],
4	fragment(
5	"word_similarity(?, CONCAT(?, ' ', ?)) > 0.6",
6	^search,
7	item.name,
8	item.description
9	)
10	)