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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

The repository for the assignment is public and Github does not allow the creation of private forks for public repositories.

The correct way of creating a private frok by duplicating the repo is documented here.

For this assignment the commands are:

Create a bare clone of the repository. (This is temporary and will be removed so just do it wherever.)

git clone --bare [email protected]:usi-systems/easytrace.git

React Navigation is a great component for building mobile applications. It is versatile and supports both dominant platforms beautifully. However, despite the 2 libraries that exist out there to support this component in the Clojure ecosystem, there is sadly very little documentation on what and how you can set up and use this component. I could not get them to work for me (my failing) so I decided to try and make it work without the existing libraries just to that I can understand what is going on. Below is a laying out of my experience. Let me know if you have corrections so that we mortals who are not that sharp can learn.

React Navigation requires an exact set of steps to make it successfully work

Step 1: Installation of React Navigation

Use yarn to add the library to the project

React Navigation in Clojurescript

I have been using v2 of React navigation for some time but needed to find a good article or source describing how to integrate it into a clojurescript project using Reagent, Re-frame, Shadow-cljs and no Leiningen or Figwheel. No offence to those libraries and tools, I just wanted to use Shadow so that I could also take advantage of the easy use of deps.edn. So how do you use React Navigation v3 in CLJS ?

Install Stuff

Make sure you have a project setup and install React Navigation using yarn or npm. I will not cover this. Please see this basic project setup from the shadow site as a reference :

Shadow CLJS Examples

The Basic Setup

Introductory resources

High level overview https://yogthos.github.io/ClojureDistilled.html
An Animated Introduction to Clojure https://markm208.github.io/cljbook/
Interactive tutorial in a browser https://tryclojure.org/
Interactive exercises http://clojurescriptkoans.com/
Clerk notebooks with introductory examples https://github.clerk.garden/anthonygalea/notes-on-clojure
More interactive exercises https://4clojure.oxal.org/
Lambda Island tutorials https://lambdaisland.com/
Functional Programming with Clojure resources https://practicalli.github.io/

Use pre-built gccemacs

Fortunatly we could use pre-built gccemacs right now.

Those two repos did the greate job for us.

https://github.com/twlz0ne/nix-gccemacs-darwin

https://github.com/twlz0ne/nix-gccemacs-sierra

Here is the tutorial:

My answer to: https://www.reddit.com/r/Clojure/comments/pcwypb/us_engineers_love_to_say_the_right_tool_for_the/ which asked to know when and at what is Clojure "the right tool for the job"?

My take is that in general, the right tool for the job actually doesn't matter that much when it comes to programming language.

There are only a few cases where the options of tools that can do a sufficiently good job at the task become limited.

That's why they are called: General-purpose programming languages, because they can be used generally for most use cases without issues.

Let's look at some of the dimensions that make a difference and what I think of Clojure for them:

	#!/bin/bash

	if [[ "$#" < "2" \|\| "$#" > "3" ]]; then
	cat <<END
	Glusterfs GFID resolver -- turns a GFID into a real file path

	Usage: $0 <brick-path> <gfid> [-q]

	<brick-path> : the path to your glusterfs brick (required)

	/*
	* Create Tables
	*/

	CREATE TABLE IF NOT EXISTS `PREFIX_permissions` (
	`ID` int(11) NOT NULL auto_increment,
	`Lft` int(11) NOT NULL,
	`Rght` int(11) NOT NULL,
	`Title` char(64) NOT NULL,
	`Description` text NOT NULL,

	CustomScrollView(
	physics:
	const BouncingScrollPhysics(parent: AlwaysScrollableScrollPhysics()),
	slivers: <Widget>[
	SliverAppBar(
	title: Text(
	"Example",
	style: heading1,
	),
	floating: true,