Adam Cooper amcooper

Knex - Express - CRUD

Practicing Relationships

Quickly Setup Your Project

Let's quickly review creating a new project utilizing todos.

Init a new Project

Here's an example of how to debug Mocha v4 if it hangs.

Ensure you're using a Node.js 8 or newer (or any version with async_hooks support).

If you run your test, you'll notice it hangs:

$ mocha test.js

Array Iteration

https://gist.github.com/ljharb/58faf1cfcb4e6808f74aae4ef7944cff

While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it mu

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

	#!/bin/bash
	#
	# Re-Open KeePassXC Database
	#
	# - Requests password of a KeePassXC database from the system keyring and opens
	# it
	# - Listens to DBUS LockedHint signals. Closes the database on lock, reopens it
	# on unlock
	#
	#

	// Simple gist to test parallel promise resolution when using async / await

	function promiseWait(time) {
	return new Promise((resolve, reject) => {
	setTimeout(() => {
	resolve(true);
	}, time);
	});
	}

	#!/bin/bash

	for file in $(git diff --cached --name-only \| grep -E '\.(js\|jsx)$')
	do
	git show ":$file" \| node_modules/.bin/eslint --stdin --stdin-filename "$file" # we only want to lint the staged changes, not any un-staged changes
	if [ $? -ne 0 ]; then
	echo "ESLint failed on staged file '$file'. Please check your code and try again. You can run ESLint manually via npm run eslint."
	exit 1 # exit with failure status
	fi
	done

	# The first 12 digits of pi are 314159265358. We can make these digits into an expression evaluating to 27182 (first 5 digits of e) as follows:

	# 3141 * 5 / 9 * 26 / 5 * 3 - 5 * 8 = 27182
	# or
	# 3 + 1 - 415 * 92 + 65358 = 27182

	# Notice that the order of the input digits is not changed. Operators (+,-,/, or *) are simply inserted to create the expression.

	# Write a function to take a list of numbers and a target, and return all the ways that those numbers can be formed into expressions evaluating to the target. Do not use the eval function in Python, Ruby or JavaScript

	import decamelize from 'decamelize';
	import { fromGlobalId } from 'graphql-relay';
	import pluralize from 'pluralize';

	import getItem from '../api/getItem';

	const types = {};
	const endpoints = {};
	const getItemOverrides = {};