Eddie Flores ef2k

This guide enables port forwarding for foo.com to localhost:3000. Tested on macOS High Sierra.

Add the domain to /etc/hosts

$ sudo nvim /etc/hosts

Add the following:

Using Promises in your Asynchoronous Code

If you've written your share of JavaScript, you've likely encountered scenarios where independent asynchronous requests need to complete before execution can continue. In many cases, you're forced to impose an order to the requests and nest some callbacks to be notified of their completion. Another common, albeit dirty approach, is to pollute the parent scope of the events with flags of some sort and poll them on a particular time interval until completion.

In either case, maintainability becomes a nightmare and will likely cause future readers of your code to do an enormous amount of desk flipping.

Fortunately enough, we can dig into our bag of constructs and make use of what's commonly referred to as a promise, an abstract concept thats made its way into jQuery and has recently gained native support in modern browsers.

##Promises - A Brief Introduction ##

	# you have ctags but it does not work...
	$ ctags -R --exclude=.git --exclude=log *
	ctags: illegal option -- R
	usage: ctags [-BFadtuwvx] [-f tagsfile] file ...

	#you need to get new ctags, i recommend homebrew but anything will work
	$ brew install ctags

	#alias ctags if you used homebrew
	$ alias ctags="`brew --prefix`/bin/ctags"

	#!/usr/bin/env bash

	# Use this one-liner to produce a JSON literal from the Git log:

	git log \
	--pretty=format:'{%n "commit": "%H",%n "author": "%an <%ae>",%n "date": "%ad",%n "message": "%f"%n},' \
	$@ \| \
	perl -pe 'BEGIN{print "["}; END{print "]\n"}' \| \
	perl -pe 's/},]/}]/'

	document.attachEvent("onreadystatechange", function(){
	if (document.readyState === "complete"){
	document.detachEvent( "onreadystatechange", arguments.callee );
	// code ...
	}
	});

	For instance, to copy a file called rental_agreement.doc from our remote machine to a new file called agreement.doc on our local machine, we’d execute:

	scp [email protected]:/Users/tandorra/Desktop/rental_agreement.doc agreement.doc

	Obviously, the burden in this situation is knowing the exact location and name of the file before transferring it. Copying a file from your local machine to a remote one is a little easier. In that situation, we’d execute this command instead:

	scp file-to-copy user@remote-address:path-to-new-saved-file

	openssl genrsa -des3 -out fooboo.key 2048
	openssl req -new -key fooboo.key -out fooboo.csr
	openssl x509 -req -days 365 -in fooboo.csr -signkey fooboo.key -out fooboo.crt