Ferdinand Mirasol makoy21

While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it much simpler to think about both the old list and the new one, what they contain, and

	// Run from the dev tools console of any Youtube video
	// Accurate as of October 28, 2016. Uses quality + video type for naming now,
	// prevents video urls being overwritten.

	// ES6 version
	const videoUrls = ytplayer.config.args.url_encoded_fmt_stream_map
	.split(',')
	.map(item => item
	.split('&')
	.reduce((prev, curr) => (curr = curr.split('='),

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048