Mike Thompson mike-thompson-day8

(defn debug-cljs-devtools
  "This is a drop-in alternative for the offical re-frame `debug` middleware
  It is better because: 
    - it writes data, rather than strings, to js/console. This better leverages  
      the power of cljs-devtols.
    - it exploits js/console's ability to colorize text, hopefully making the 
      output easier to grok."
  [handler]
 (fn debug-handler

de-dupe

The Problem

Persistent Data Strctures use structural sharing to create an efficient in-memory representation, but these same structures can be a problem to serialize/deserialize.

First, the shared parts are duplicated in the serialised output which can lead to a large and inefficient representation.

Second, when the process is reversed, deserialization doesn't recreate the original, shared, effcient in-memory representation because sharing information was lost in the original serialisation.

	> This Gist is out of date. It has been superseded by
	> https://gist.github.com/mike-thompson-day8/d61692451166e206a9c43771c8b389fc

	;; WARNING: this code is untested. In fact not even compiled.
	;; It is just meant to be indicative of how `regsub` might work/look.

	(ns todomvc.subs
	(:require-macros [reagent.ratom :refer [reaction]])
	(:require [re-frame.core :refer [register-sub]]))

	(defn on-changes
	"Middleware factory which acts a bit like \"reaction\" (but it flows into db , rather than out)
	It observes N inputs (paths into db) and if any of them change (as a result of the
	handler being run) then it runs 'f' to compute a new value, which is
	then assoced into the given out=path within app-db.

	Usage:

	(defn my-f
	[a-val b-val]

	<html lang="en">
	<head>
	<title>Unit Tests</title>

	<!-- Use a monspace font and a dark theme -->
	<!-- Colour Palet from http://clrs.cc/ -->
	<style>
	body {
	font-family: Courier, "Courier New", monospace;
	font-size: 11;