j-j.eth jjgonecrypto

#Create dynamic objects in a nodejs6 REPL with Proxy

Nodejs 6.x comes with ES6 Proxy support baked in. Just like Ruby's method-missing (aka ghost methods), you can intercept getters and setters on an object and, like ActiveRecord in Rails, write rich APIs that can take any method or property name you like.

They are particularly fun in a REPL, where you might want to handle undefined variables.

For example, say we started a nodejs REPL via:

	import Start from './Start'
	import NextPage from './NextPage'

	const Views = { Start, NextPage }

	<Navigator
	initialRoute={{ view: 'Start' }}
	renderScene={(route, navigator) => {
	const SceneComponent = Views[route.view];
	return <SceneComponent {...route.props} navigator={navigator} />;

	class Person
	info: {}
	setName: (name) -> @info.name = name

	justin = new Person()
	justin.setName "justin"

	paul = new Person()

	require.config
	baseUrl: '/static/coffee/app'
	paths:
	text: '/static/js/require.text'
	underscore: '/static/js/underscore-min'
	backbone: '/static/js/backbone-min'
	backboneTP: '/static/js/backbone-tastypie'
	shim:
	underscore:
	exports: '_'

	Feature: Present clearly
	As a presenter
	I'd like to ensure my content is clear and concise
	So that my audience understand the value of Cucumber

	Scenario: Ensure audience can see the presentation
	Given I start the presentation off
	Then the audience should be able to see the initial slide
	And the slide should have the content "green like a cuke!"

	this.browser.clickLink(link, function(e, b, s) {
	b.onconfirm(function(q){ return true; });
	callback(e,b,s);
	});

	#Usage echoline LINE_NUMBER FILE
	function echoline() { sed -n "$(($1 - 5)),$(($1 + 5))p" $2; }

	doc = document.implementation.createDocument('http://www.w3.org/1999/xhtml', 'html')
	doc.documentElement.innerHTML = "<div><p class='first'>...</p></div>"
	nodeList = doc.querySelectorAll(".first")