Wilson Muñoz Wilsonilo

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

By Edmond Lau
Highly Recommended 👍
http://www.theeffectiveengineer.com/

What's an Effective Engineer?

#Understanding closures, callbacks and promises

For a code newbie like myself, callbacks, closures and promises are scary JavaScript concepts.

10 months into my full-time dev career, and I would struggle to explain these words to a peer.

So I decided it was time to face my fears, and try to get my head around each concept.

Here are the notes from my initial reading. I'll continue to refine them as my understanding improves.

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Powerlevel10k

Make it real

Ideas are cheap. Make a prototype, sketch a CLI session, draw a wireframe. Discuss around concrete examples, not hand-waving abstractions. Don't say you did something, provide a URL that proves it.

Ship it

Nothing is real until it's being used by a real user. This doesn't mean you make a prototype in the morning and blog about it in the evening. It means you find one person you believe your product will help and try to get them to use it.

	func scaleTransform(for view: UIView, scaledBy scale: CGPoint, aroundAnchorPoint relativeAnchorPoint: CGPoint) -> CGAffineTransform {
	let bounds = view.bounds
	let anchorPoint = CGPoint(x: bounds.width * relativeAnchorPoint.x, y: bounds.height * relativeAnchorPoint.y)
	return CGAffineTransform.identity
	.translatedBy(x: anchorPoint.x, y: anchorPoint.y)
	.scaledBy(x: scale.x, y: scale.y)
	.translatedBy(x: -anchorPoint.x, y: -anchorPoint.y)
	}

	var performers;

	performers = {};

	async.parallel({
	conductor: function(callback) {
	return conductor.find({}, function(err, result) {
	return callback(err, result);
	});
	},