Stratos Pavlakis th3hunt

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Ctrl + Shift + S save as

Create your library

Initialize project npm init -y

Create esm module ./src/esm/my-lib.js

function addNumber(value, value2) {
  return value + value2;
}

export { addNumber };

HTTP Streaming (or Chunked vs Store & Forward)

The standard way of understanding the HTTP protocol is via the request reply pattern. Each HTTP transaction consists of a finitely bounded HTTP request and a finitely bounded HTTP response.

However it's also possible for both parts of an HTTP 1.1 transaction to stream their possibly infinitely bounded data. The advantages is that the sender can send data that is beyond the sender's memory limit, and the receiver can act on

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

AWS ECS Deploy Permissions

In order to be able to deploy using the scripts provided by npm scripts for AWS ECS make sure your user is part of an IAM Group that has the following inline policy applied to it.

Note: This may not be complete.

{
    "Version": "2012-10-17",
    "Statement": [

What is your folder-structure preference for a large-scale Node.js project?

0: Starting from Rails

This is the reference point. All the other options are based off this.

|-- app
|   |-- controllers
|   |   |-- admin

Clustering: The basics

The trick? pass the file descriptor from a parent process and have the server.listen reuse that descriptor. So multiprocess in their own memory space (but with ENV shared usually)

It does not balance, it leaves it to the kernel.

In the last nodejs > 0.8 there is a cluster module (functional although marked experimental)

http://nodejs.org/api/cluster.html
Simple cluster example:

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
elem.getClientRects(), elem.getBoundingClientRect()

	-- show running queries (pre 9.2)
	SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
	FROM pg_stat_activity
	WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
	ORDER BY query_start desc;

	-- show running queries (9.2)
	SELECT pid, age(clock_timestamp(), query_start), usename, query
	FROM pg_stat_activity
	WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'

	####
	# ZSH function to auto-switch to correct Node version
	# https://gist.github.com/callumlocke/30990e247e52ab6ac1aa98e5f0e5bbf5
	#
	# - Searches up your directory tree for the closest .nvmrc, just like `nvm use` does.
	#
	# - If you are already on the right Node version, IT DOES NOTHING, AND PRINTS NOTHING.
	#
	# - Works correctly if your .nvmrc file contains something relaxed/generic,
	# like "4" or "v12.0" or "stable".