Josep Servat servatj

Eric Elliott's "Master the JavaScript Interview" Series

A collection of links to the "Master the JavaScript Interview" series of medium stories by Eric Elliott.

Not part of the series but a good grounding.

Master the JavaScript Interview

Experimenting with AWS Lambda for ETL

A lot of us are interested in doing more analysis with our service logs so I thought I'd share an experiment I'm doing with Sync. The main idea is to transform the raw logs into something that'll be nice to query and generate reports with in Redshift.

The Pipeline

Logs make their way into an S3 bucket (lets call it the 'raw' bucket) where we've got a lambda listening for new data. This lambda reads the raw heka protobuf gzipped data, does some transformation and writes a new file to a different S3 bucket (the 'processed' bucket) in a format that is redshift friendly (like json or csv). There's another lambda listening on the processed bucket that loads this data into Redshift.

In the below keyboard shortcuts, I use the capital letters for reading clarity but this does not imply shift, if shift is needed, I will say shift. So ⌘ + D does not mean hold shift. ⌘ + Shift + D does of course.

Tabs and Windows

Function	Shortcut
New Tab	`⌘` + `T`
Close Tab or Window	`⌘` + `W` (same as many mac apps)
Go to Tab	`⌘` + `Number Key` (ie: `⌘2` is 2nd tab)
Go to Split Pane by Direction	`⌘` + `Option` + `Arrow Key`

Screen Quick Reference

Basic

Description	Command
Start a new session with session name	`screen -S <session_name>`
List running sessions / screens	`screen -ls`
Attach to a running session	`screen -x`
Attach to a running session with name	`screen -r`

	/*
	Búsqueda binaria (Binary Search): Implementación de ejemplo.

	Recibe un array ordenado y el elemento a buscar. Si encuentra el elemento
	devolverá el índice del elemento encontrado, si no se encuentra devolverá `-1`.
	*/


	function binarySearch(array, item) {

	# RSpec's subject method, both implicitly and explicitly set, is useful for
	# declaratively setting up the context of the object under test. If you provide a
	# class for your describe block, subject will implicitly be set to a new instance
	# of this class (with no arguments passed to the constructor). If you want
	# something more complex done, such as setting arguments, you can use the
	# explicit subject setter, which takes a block.
	describe Person do
	context "born 19 years ago" do
	subject { Person.new(:birthdate => 19.years.ago }
	it { should be_eligible_to_vote }