Spencer Elliott elliottsj

A Guide to Functional Programming Lingo for JavaScripters

Functional programming gets a bad wrap about being too hard for mere mortals to comprehend. This is nonsense. The concepts are actually quite simple to grasp.

The jargon is the hardest part. A lot of that vocabulary comes from a specialized field of mathematical study called category theory (with a liberal sprinkling of type theory and abstract algebra). This sounds a lot scarier than it is. You can do this!

All examples using ES6 syntax. wrap (foo) => bar means:

function wrap (foo) {

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

const Article = require('../../../../app/models/article');

Those suck for maintenance and they're ugly.

	/**
	* Actively wait for an element present and displayed up to specTimeoutMs
	* ignoring useless webdriver errors like StaleElementError.
	*
	* Usage:
	* Add `require('./waitReady.js');` in your onPrepare block or file.
	*
	* @example
	* expect($('.some-html-class').waitReady()).toBeTruthy();
	*/

	# Compiled source #
	###################
	*.com
	*.class
	*.dll
	*.exe
	*.o
	*.so

	# Packages #

	static NSString *cacheDatabaseName = @"ApplicationCache.db";
	static NSString *cacheGroupTable = @"CacheGroups";
	static NSString *cacheGroupTableManifestURLColums = @"manifestURL";
	static NSString *cacheTable = @"Caches";
	static NSString *cacheTableCacheGroupId = @"cacheGroup";

	/**
	Clears the cached resources associated to a cache group.

	@param manifestURLs An array of `NSString` containing the URLs of the cache manifests for which you want to clear the resources.

	var parser = document.createElement('a');
	parser.href = "http://example.com:3000/pathname/?search=test#hash";

	parser.protocol; // => "http:"
	parser.hostname; // => "example.com"
	parser.port; // => "3000"
	parser.pathname; // => "/pathname/"
	parser.search; // => "?search=test"
	parser.hash; // => "#hash"
	parser.host; // => "example.com:3000"