Raphaël Saunier raphaelsaunier

Rich Already Answered That!

A list of commonly asked questions, design decisions, reasons why Clojure is the way it is as they were answered directly by Rich (even when from many years ago, those answers are pretty much valid today!). Feel free to point friends and colleagues here next time they ask (again). Answers are pasted verbatim (I've made small adjustments for readibility, but never changed a sentence) from mailing lists, articles, chats.

How to use:

The link in the table of content jumps at the copy of the answer on this page.
The link on the answer itself points back at the original post.

Table of Content

Array Iteration

https://gist.github.com/ljharb/58faf1cfcb4e6808f74aae4ef7944cff

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 mu

How to batch convert PCD to JPEG

Kodak Photo CD support has almost gone, so the best and easy way to convert all PCD images to some more handy JPEG is to use the Photo CD Decoder pcdtojpeg. More information can be found on the project web site.

The terminal command will convert every *.PCD starting at current directory and subdirectories:

find . -name '*.PCD' -exec pcdtojpeg -q 100 -r 5 {} \;

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

General rules

Follow standard conventions.
Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
Boy scout rule. Leave the campground cleaner than you found it.
Always find root cause. Always look for the root cause of a problem.

Design rules

lodash v4.17.20

"Scar Tissues Make Relationships Wear Out"

04/26/2103. From a lecture by Professor John Ousterhout at Stanford, class CS142.

This is my most touchy-feely thought for the weekend. Here’s the basic idea: It’s really hard to build relationships that last for a long time. If you haven’t discovered this, you will discover this sooner or later. And it's hard both for personal relationships and for business relationships. And to me, it's pretty amazing that two people can stay married for 25 years without killing each other.

[Laughter]

> But honestly, most professional relationships don't last anywhere near that long. The best bands always seem to break up after 2 or 3 years. And business partnerships fall apart, and there's all these problems in these relationships that just don't last. So, why is that? Well, in my view, it’s relationships don't fail because there some single catastrophic event to destroy them, although often there is a single catastrophic event around the the end of the relation

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	<el-menu :router="true" :default-active="activeLink">
	<template v-for="rule in $router.options.routes">
	<el-submenu v-if="rule.children && rule.children.length > 0"
	:index="rule.path"
	>
	<template slot="title"><i :class="rule.icon"></i>{{ rule.title }}</template>
	<el-menu-item v-for="child in rule.children" :index="rule.path + '/' + child.path">{{ child.title }}</el-menu-item>
	</el-submenu>
	<el-menu-item v-else

	let geofireRef = FIRDatabase.database().reference()
	guard let geofire = GeoFire(firebaseRef: geofireRef.child("venues/")) else { return }

	geofire.getLocationForKey(placeKey) { (location, error) in
	if let error = error {
	print("An error occurred getting the location for \(placeKey): \(error.localizedDescription)")
	} else if let location = location {
	print("Location for \(placeKey) is [\(location.coordinate.latitude), \(location.coordinate.longitude)]")
	} else {
	print("GeoFire does not contain a location for \(placeKey)")

	$('a').each(function() {
	if(this.host !== window.location.host) {
	$(this).attr('target', '_blank');
	}
	});