Vitalii Molchanov VoltanBro

Vanilla JavaScript Quick Reference / Cheatsheet

Just migrated it from Codepen.io to markdown. Credit goes to David Conner.

Working with DOM	Working with JS	Working With Functions
Accessing Dom Elements	Add/Remove Array Item	Add Default Arguments to Function
Grab Children/Parent Node(s)	Add/Remove Object Properties	Throttle/Debounce Functions
Create DOM Elements	Conditionals

	SELECT * FROM user_accounts WHERE id IN (
	SELECT
	id
	FROM (
	SELECT
	id,
	ROW_NUMBER() OVER w AS rnum
	FROM user_accounts
	WINDOW w AS (
	PARTITION BY user_profile_id

	module DownloadHelper
	TIMEOUT = 3
	PATH = Rails.root.join("tmp/downloads")

	module_function

	def downloads
	Dir[PATH.join("*")]
	end

	trait :my_custom do
	transient do
	params {{}}
	end

	after(:build) do \|field, evaluator\|
	field.name = evaluator.params[:name]
	end
	end

	[Line 1] ✐ NOTE: This is here because sometimes an intermittent issue appears.
	[Line 7] ↻ OPTIMIZE: This could be reworked to not do a O(N2) lookup.
	[Line 9] ✓ TODO from John: Add a check here to ensure these are always strings.
	[Line 24] ✄ HACK: I am doing something here that is horrible, but it works for now...
	[Line 89] ✗ XXX: Let's do this better next time? It's bad.
	[Line 136] ☠ FIXME: We sometimes get an undefined index in this array.
	[Line 211] ☢ BUG: If the user inputs "Easter" we always output "Egg", even if they wanted a "Bunny".

	# frozen_string_literal: true

	class CustomerCreator < BaseInteractor
	def call
	validate_bot_owner
	create_stripe_customer
	end

	private

	http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
	http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

	#payload: [{"kind"=>"person"}]
	Segment.where("payload @> ?", [{kind: "person"}].to_json)

	#data: {"interest"=>["music", "movies", "programming"]}
	Segment.where("data @> ?", {"interest": ["music", "movies", "programming"]}.to_json)
	Segment.where("data #>> '{interest, 1}' = 'movies' ")
	Segment.where("jsonb_array_length(data->'interest') > 1")

	Started POST "/api/v1/sign_in" for 127.0.0.1 at 2020-06-06 03:00:06 +0300
	(0.4ms) SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC
	Processing by Api::V1::SessionsController#create as JSON
	Parameters: {"courier"=>{"email"=>"[email protected]", "password"=>"[FILTERED]"}, "session"=>{"courier"=>{"email"=>"[email protected]", "password"=>"[FILTERED]"}}}
	Courier Load (0.4ms) SELECT "couriers".* FROM "couriers" WHERE "couriers"."id" = $1 ORDER BY "couriers"."id" ASC LIMIT $2 [["id", 1], ["LIMIT", 1]]
	Completed 500 Internal Server Error in 23ms (ActiveRecord: 4.8ms \| Allocations: 9516)



	TypeError (no implicit conversion of nil into String):