DSG (Destitute Streetdwelling Guttersnipe) Destitute-Streetdwelling-Guttersnipe

Important warning

You should almost never actually use this. The same applies to fs.stat (when used for checking existence).

Checking whether a file exists before doing something with it, can lead to race conditions in your application. Race conditions are extremely hard to debug and, depending on where they occur, they can lead to data loss or security holes. Using the synchronous versions will not fix this.

Generally, just do what you want to do, and handle the error if it doesn't work. This is much safer.

If you want to check whether a file exists, before reading it: just try to open the file, and handle the ENOENT error when it doesn't exist.
If you want to make sure a file doesn't exist, before writing to it: open the file using an exclusive mode, eg. wx or ax, and handle the error when the file already exists.

Note that this will only be equivalent to Promise.try if your runtime or ES6 Promise shim correctly catches synchronous errors in Promise constructors.

If you are using the latest version of Node, this should be fine.

Promises reading list

This is a list of examples and articles, in roughly the order you should follow them, to show and explain how promises work and why you should use them. I'll probably add more things to this list over time.

This list primarily focuses on Bluebird, but the basic functionality should also work in ES6 Promises, and some examples are included on how to replicate Bluebird functionality with ES6 promises. You should still use Bluebird where possible, though - they are faster, less error-prone, and have more utilities.

I'm available for tutoring and code review :)

You may reuse all gists for any purpose under the WTFPL / CC0 (whichever you prefer).

A large list of reasons why to avoid Sails.js and Waterline: https://kev.inburke.com/kevin/dont-use-sails-or-waterline/

UPDATE: The issue has been reopened by the founder of Balderdash. Mind that the below was written back when this was not the case yet, and judge appropriately.

Furthermore, the CEO of Balderdash, the company behind Sails.js, stated the following:

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.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

"How do I get started with Node?" is a commonly heard question in #Node.js. This gist is an attempt to compile some of the answers to that question. It's a perpetual work-in-progress.

And if this list didn't quite answer your questions, I'm available for tutoring and code review! A donation is also welcome :)

Setting expectations

Before you get started learning about JavaScript and Node.js, there's one very important article you need to read: Teach Yourself Programming in Ten Years.

Understand that it's going to take time to learn Node.js, just like it would take time to learn any other specialized topic - and that you're not going to learn effectively just by reading things, or following tutorials or courses. _Get out there and build things!

When you're developing in Node.js, you're likely to run into these terms - "monolithic" and "modular". They're usually used to describe the different types of frameworks and libraries; not just HTTP frameworks, but modules in general.

At a glance

Monolithic: "Batteries-included" and typically tightly coupled, it tries to include all the stuff that's needed for common usecases. An example of a monolithic web framework would be Sails.js.
Modular: "Minimal" and loosely coupled. Only includes the bare minimum of functionality and structure, and the rest is a plugin. Fundamentally, it generally only has a single 'responsibility'. An example of a modular web framework would be Express.

Coupled?

In software development, the terms "tightly coupled" and "loosely coupled" are used to indicate how much components rely on each other; or more specifically, how many assumptions they make about each other. This directly translates to how easy it is to repla

Don't use VPN services.

No, seriously, don't. You're probably reading this because you've asked what VPN service to use, and this is the answer.

Note: The content in this post does not apply to using VPN for their intended purpose; that is, as a virtual private (internal) network. It only applies to using it as a glorified proxy, which is what every third-party "VPN provider" does.

A Russian translation of this article can be found here, contributed by Timur Demin.
A Turkish translation can be found here, contributed by agyild.
There's also this article about VPN services, which is honestly better written (and has more cat pictures!) than my article.

Problem

I have two Github accounts: oanhnn (personal) and superman (for work). I want to use both accounts on same computer (without typing password everytime, when doing git push or pull).

Solution

Use ssh keys and define host aliases in ssh config file (each alias for an account).

How to?

Generate ssh key pairs for accounts and add them to GitHub accounts.

	var inherits = require('utils').inherits
	var Model = require('some-orm').Model

	function User () {
	Model.call(this)
	}

	inherits(User, Model)

	Model.prototype.getName () {