Alvaro Alvarez alv-alvarez

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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

React && Firebase Workshop

Contact Information

@stevekinney

Prequisite Setup

A recent version of Node.js
npm install -g create-react-app

Vanilla JavaScript Quick Reference / Cheatsheet

Just migrated it from Codepen.io to markdown. Credit goes to David Conner.

Working with DOM	Working with JS	Working With Functions
Accessing Dom Elements	Add/Remove Array Item	Add Default Arguments to Function
Grab Children/Parent Node(s)	Add/Remove Object Properties	Throttle/Debounce Functions
Create DOM Elements	Conditionals

Finding a Ruby memory leak using a time analysis

When developing a program in Ruby, you may sometimes encounter a memory leak. For a while now, Ruby has a facility to gather information about what objects are laying around: ObjectSpace.

There are several approaches one can take to debug a leak. This discusses a time-based approach, where a full memory dump is generated every, say, 5 minutes, during a time that the memory leak is showing up. Afterwards, one can look at all the objects, and find out which ones are staying around, causing the

OBSOLETE

This entire guide is based on an old version of Homebrew/Node and no longer applies. It was only ever intended to fix a specific error message which has since been fixed. I've kept it here for historical purposes, but it should no longer be used. Homebrew maintainers have fixed things and the options mentioned don't exist and won't work.

I still believe it is better to manually install npm separately since having a generic package manager maintain another package manager is a bad idea, but the instructions below don't explain how to do that.

Fixing npm On Mac OS X for Homebrew Users

Installing node through Homebrew can cause problems with npm for globally installed packages. To fix it quickly, use the solution below. An explanation is also included at the end of this document.

Chapter 1 - Object Oriented Design

The purpose of design is to allow you to do design later, and it's primary goal is to reduce the cost of change.

SOLID Design:

Single Responsibility Principle: a class should have only a single responsibility
Open-Closed Principle: Software entities should be open for extension, but closed for modification (inherit instead of modifying existing classes).
Liskov Substitution: Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
Interface Segregation: Many client-specific interfaces are better than one general-purpose interface.

	// for multiple requests
	let isRefreshing = false;
	let failedQueue = [];

	const processQueue = (error, token = null) => {
	failedQueue.forEach(prom => {
	if (error) {
	prom.reject(error);
	} else {
	prom.resolve(token);

	{
	"env": {
	"node": true,
	"es6": true
	},
	"ecmaFeatures": {
	"arrowFunctions": true,
	"blockBindings": true,
	"classes": true,
	"defaultParameters": true,

	javascript:((function registerKompass() {
	var step1 = {
	radio: ["rdoServiceIn_0"],
	common: {
	"txtLastName": 'PASSPORT LAST NAME',
	"txtFirstName": 'PASSPORT FIRST NAME',
	"txtDob": 'yyyy-mm-dd',
	"ddlCitizenship": 'COUNTRY', // CL == Chile
	"txtEmailAddress": '[email protected]',
	"txtEmailAddressConfirm": '[email protected]',