Austin Turner paustint

PostgreSQL is Enough

Background and Cron Jobs

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

Definitely not comprehensive. This is meant to be a basic memory aid with links to get more details. I'll add to it over time.

Install

$ npm install mongoose --save

Connect

const mongoose = require('mongoose');

	{
	"version": "0.2.0",
	"configurations": [
	{
	"name": "Example",
	"type": "node",
	"request": "launch",
	"runtimeExecutable": "node",
	"runtimeArgs": ["--nolazy", "-r", "ts-node/register/transpile-only"],

	QUERY ::= 'SELECT' ('COUNT()' \| (FIELD ( ',' FIELD)*))
	'FROM' (NAME ('AS' ? NAME)? ('USING' NAME)?) ( ',' NAME ('AS' ? NAME)? ('USING' NAME)?)*
	('WHERE' CONDITIONEXPR )?
	('ORDER BY' ORDERBYEXPR)?
	('LIMIT' POSINTEGER )?
	FIELD ::= NAME \| '(' QUERY ')'
	CONDITIONEXPR ::= ANDEXPR \| OREXPR \| NOTEXPR \| SIMPLEEXPR
	ANDEXPR ::= 'AND' SIMPLEEXPR
	OREXPR ::= 'OR' SIMPLEEXPR
	NOTEXPR ::= 'NOT' SIMPLEEXPR

	FROM alpine

	RUN apk add --no-cache curl jq