rpnna

Redux Selector Pattern

Imagine we have a reducer to control a list of items:

function listOfItems(state: Array<Object> = [], action: Object = {}): Array<Object> {
  switch(action.type) {
    case 'SHOW_ALL_ITEMS':
      return action.data.items
    default:

Debugging ES6 in VS Code

My current editor of choice for all things related to Javascript and Node is VS Code, which I highly recommend. The other day I needed to hunt down a bug in one of my tests written in ES6, which at time of writing is not fully supported in Node. Shortly after, I found myself down the rabbit hole of debugging in VS Code and realized this isn't as straightforward as I thought initially. This short post summarizes the steps I took to make debugging ES6 in VS Code frictionless.

What doesn't work

My first approach was a launch configuration in launch.json mimicking tape -r babel-register ./path/to/testfile.js with babel configured to create inline sourcemaps in my package.json. The debugging started but breakpoints and stepping through the code in VS Code were a complete mess. Apparently, ad-hoc transpilation via babel-require-hook and inline sourcemaps do not work in VS Code. The same result for attaching (instead of launch) to `babel-node

Fluid Aspect

fluid-aspect is a Sass mixin for creating intrinsic ratios in CSS. Intrinsic ratios allow elements to fill the width of their containing block and resize on the fly while maintaining their aspect ratio.

@include fluid-aspect($ratio, [$target]);

$ratio: An aspect ratio represented as two numbers separated by a space. Defaults to 1:1
$target: A selector targeting the element to be made fluid. Defaults to "> :first-child"

	/*
	Instructions for MacOS:

	- Install the fonts 'Operator Mono' & 'Fira Code'
	- Install theme 'Dark Candy'
	- Add the following config to the VS Code settings.json:

	{
	"editor.renderWhitespace": "all",
	"editor.fontSize": 14,

	// articles per page
	var limit = 10;

	// pagination middleware function sets some
	// local view variables that any view can use
	function pagination(req, res, next) {
	var page = parseInt(req.params.page) \|\| 1,
	num = page * limit;
	db.articles.count(function(err, total) {
	res.local("total", total);