Justin Stewart 4justinstewart

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#Understanding closures, callbacks and promises

For a code newbie like myself, callbacks, closures and promises are scary JavaScript concepts.

10 months into my full-time dev career, and I would struggle to explain these words to a peer.

So I decided it was time to face my fears, and try to get my head around each concept.

Here are the notes from my initial reading. I'll continue to refine them as my understanding improves.

	#!/bin/sh
	# Modified version of script found at
	# http://devblog.springest.com/a-script-to-remove-old-git-branches

	# This has to be run from main
	git checkout main

	# Update our list of remotes
	git fetch origin
	git remote prune origin

	def find_unknown_object(uuid_string)

	db_connection = ActiveRecord::Base.connection

	db_connection.tables.each do \|table_string\|
	begin
	model = table_string.classify.constantize
	object = model.find(uuid)

	return object unless object.nil?

	<!DOCTYPE html>
	<html>
	<head>
	<title>DOM manipulation with jQuery</title>

	<!-- Add a link to jQuery CDN here script here -->

	<script type="text/javascript" src="jquery_example.js"></script>
	</head>
	<body>

	class BoggleBoard

	attr_reader :board

	def initialize(board_name = create_board)
	@board = board_name
	end

	def create_word(*coords)
	coords.map { \|coord\| board[coord.first][coord.last] }.join

	# INITIAL CODE
	class BoggleBoard
	attr_reader :board_type

	def initialize(board_type)
	@board_type = board_type
	end

	def create_word(*coords)
	coords.map { \|coord\| @board_type[coord.first][coord.last]}.join("")