Michael D mding5692

2015-01-29 Unofficial Relay FAQ

Compilation of questions and answers about Relay from React.js Conf.

Disclaimer: I work on Relay at Facebook. Relay is a complex system on which we're iterating aggressively. I'll do my best here to provide accurate, useful answers, but the details are subject to change. I may also be wrong. Feedback and additional questions are welcome.

What is Relay?

Relay is a new framework from Facebook that provides data-fetching functionality for React applications. It was announced at React.js Conf (January 2015).

Git Cheat Sheet

Commands

Getting Started

git init

or

You got your hands on some data that was leaked from a social network and you want to help the poor people.

Luckily you know a government service to automatically block a list of credit cards.

The service is a little old school though and you have to upload a CSV file in the exact format. The upload fails if the CSV file contains invalid data.

The CSV files should have two columns, Name and Credit Card. Also, it must be named after the following pattern:

YYYYMMDD.csv.

Let's solve the following physics problem using Symbolism, a computer algebra library for C#.

One strategy in a snowball fight is to throw a first snowball at a high angle over level ground. While your opponent is watching the first one, you throw a second one at a low angle and timed to arrive at your opponent before or at the same time as the first one.

Assume both snowballs are thrown with a speed of 25.0 m/s.

The first one is thrown at an angle of 70.0° with respect to the horizontal.

I would like to tell my story of burnout at Amazon, considering the fact that there is so many stories out there on both sides of the issue. My story is also on both sides of the issue, and I've had a lot of time to think about why people can see the same culture but come away with completely different conclusions. This is a throwaway because I still work there and I don't plan on changing that, and I don't exactly trust the company to take this in good faith, despite the fact that I mean this as a purely constructive criticism for a company that I really do like.

I am an autodidact (my formal education only tangentially describes what I can do), and a polymath (capable of holding my own amongst PhD-level Operations Researchers, Statisticians, Econometricians, Data Scientists, Computer Scientists, as well as Software Engineers). I love to solve real world problems, and in many ways am the perfect type of person for Amazon's culture. I started in a level 5 position, but felt from the beginning that I warrant

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

Stores data elements based on an sequential, most commonly 0 based, index.
Based on tuples from set theory.

if !database: wget + grep

The Federal Aviation Administration is posting PDFs of the Section 333 exemptions that it grants, i.e. the exemptions for operators who want to fly drones commercially before the FAA finishes its rulemaking. A journalist wanted to look for exemptions granted to operators in a given U.S. state. But the FAA doesn't appear to have an easy-to-read data file to use and doesn't otherwise list exemptions by location of operator.

However, since their exemptions page is just one giant HTML table for listing the PDFs, we can just use wget to fetch all the PDFs, run pdftotext on each file, and then [grep](https://medium.com/@rualthanzauva/grep-was-a-private-command-of-m

	* {
	font-size: 12pt;
	font-family: monospace;
	font-weight: normal;
	font-style: normal;
	text-decoration: none;
	color: black;
	cursor: default;
	}

	func takeScreenshot(view: UIView) -> UIImageView {
	UIGraphicsBeginImageContext(view.frame.size)
	view.layer.renderInContext(UIGraphicsGetCurrentContext())
	let image = UIGraphicsGetImageFromCurrentImageContext()
	UIGraphicsEndImageContext()
	UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)

	return UIImageView(image: image)
	}

	// To check if a number is between a range, don't do
	if number >=0 && number <= 100 {

	}
	// Use range and news operators instead :
	if 0...100 ~= number {

	}