Roberto Guerra uris77

Clojure Destructuring Tutorial and Cheat Sheet

Simply put, destructuring in Clojure is a way extract values from a datastructure and bind them to symbols, without having to explicitly traverse the datstructure. It allows for elegant and concise Clojure code.

Vectors and Sequences

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

Frontend Development

Attention: the list was moved to

https://github.com/dypsilon/frontend-dev-bookmarks

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MixedLayout

MixedLayouts are our custom extension of MarionetteLayouts which we use to wrap a heterogeneous collection of Backbone Views. This allows us to change the contents of complex pages all at once while preventing zombie views and leaving certain static elements like Navigation, Toolbar, or FooterViews on the page.

Rationale and Raison d'être

Marionette's Composite and CollectionViews are limited to rendering all their associated collection's items with the same ItemView. For our homepage, e.g., we need to encapsulate various Views - TopView, CategoryView, QuoteOfTheDayView etc. - in dynamic order into one Marionette View construct that can be .closed() to prevent zombie views. The Marionette view component designed to encapsulate heterogeneous subviews is the Layout. However, we cannot use a vanilla MarionetteLayout for the homepage because a Layout relies

Here's how to install PostgreSQL and have it run automatically at startup, on an Ubuntu 10.04 virtual machine using Vagrant. This took me a while to figure out:

Add the default lucid32 base box to your vagrant, if you haven't already:

host> vagrant box add lucid32 http://files.vagrantup.com/lucid32.box

Now make a new lucid32 virtual machine and install postgresql on it:

	// MIT License
	//
	// Copyright (c) 2023 Simon Lightfoot
	//
	// Permission is hereby granted, free of charge, to any person obtaining a copy
	// of this software and associated documentation files (the "Software"), to deal
	// in the Software without restriction, including without limitation the rights
	// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	// copies of the Software, and to permit persons to whom the Software is
	// furnished to do so, subject to the following conditions:

	// MIT License
	//
	// Copyright (c) 2023 Simon Lightfoot
	//
	// Permission is hereby granted, free of charge, to any person obtaining a copy
	// of this software and associated documentation files (the "Software"), to deal
	// in the Software without restriction, including without limitation the rights
	// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	// copies of the Software, and to permit persons to whom the Software is
	// furnished to do so, subject to the following conditions:

	// MIT License
	//
	// Copyright (c) 2025 Simon Lightfoot & Scott Stoll
	//
	// Permission is hereby granted, free of charge, to any person obtaining a copy
	// of this software and associated documentation files (the "Software"), to deal
	// in the Software without restriction, including without limitation the rights
	// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	// copies of the Software, and to permit persons to whom the Software is
	// furnished to do so, subject to the following conditions:

	//grails-app/conf/BootStrap.groovy
	import org.vertx.java.platform.PlatformLocator

	class BootStrap {
	def vertxPlatformManager

	def init = { servletContext ->
	vertxPlatformManager = PlatformLocator.factory.createPlatformManager()
	URL[] classpath = [new File('./src/verticles').toURI().toURL()]
	vertxPlatformManager.deployVerticle(