Shane Moloney Shane24

Gettings started writing a ESLint rule

First, take a look at the ESLint rule documentation. Just skim it for now. It's very long and boring. You can come back to it later.

ESLint rules works on the AST (Abstract Syntax Tree) representation of the code. In short, this is a tree structure that describes the code in a very verbose form. ESLint walks this tree and rules can subscribe to be notified when it hits a specific node type, like a Literal type, which could be the "hello" part of const welcome = "hello";.

Go ahead and play around with some code in AST Explorer (Make sure the parser is espree). It's a great tool!

Here are some good articles on the subject (ignore the scaffolding parts):

https://insideops.wordpress.com/2015/12/08/creating-custom-rules-for-eslint/

Answering the Front-end developer JavaScript interview questions to the best of my ability.

Explain event delegation

Sometimes you need to delegate events to things.

Explain how this works in JavaScript

This references the object or "thing" defined elsewhere. It's like "hey, thing I defined elsewhere, I'm talkin' to you."

Explain how prototypal inheritance works.

	for (var i=1; i <= 20; i++)
	{
	if (i % 15 == 0)
	console.log("FizzBuzz");
	else if (i % 3 == 0)
	console.log("Fizz");
	else if (i % 5 == 0)
	console.log("Buzz");
	else
	console.log(i);