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R1:

en 
    conf t
        int g0/0
            no shut
        ex
        int g0/0.50

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class SetBuffer {
    constructor(idFn) {
        this.items = new Map()
        this.idFn = idFn
    }

    isEmpty() {
        return this.items.size === 0
    }

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{
    "Function arrow": {
        "prefix": "->",
        "body": "→"
    },
    "Do arrow": {
        "prefix": "<-",
        "body": "←"
    },
    "Constraint arrow": {

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export const withLazyLoading = (getComponent, { LoaderComponent = null }) =>
    class WithLazyLoading extends React.Component {
        state = {
            Component: null,
        }

        componentWillMount() {
            const { startLoading, stopLoading } = this.props

            startLoading()

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function withLazyLoading(
  getComponent,
  Spinner = null,
  onError = noop,
) {
    return class LazyLoadingWrapper extends React.Component {
        state = {
            Component: null,
        }

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withLazyLoading(
  () => import('./features/Post'),
  <Loading type="spinner" />
)

// We can name the chunk
withLazyLoading(
  () => import(/* webpackChunkName: "Post" */ './features/Post'),
  <Loading type="spinner" />
)

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// ./src/features/Posts/index.js

// instead of directly exporting, we export wrapped
export default withLazyLoading(
  () => import(/* webpackChunkName: "Post" */ './components/Post'),
  <Loading type="spinner" />
)

// ./src/views/News/index.jsx
import Post from '...'

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function reducer(state = [], action) {
  switch (action.type) {
    /* ... */
    case 'FETCH_POSTS_SUCCESS':
      return [...state, ...action.payload]
    /* ... */
    default:
      return state 

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⇐ back to the gist-blog at jrw.fi

Advanced SCSS

Or, 16 cool things you may not have known your stylesheets could do. I'd rather have kept it to a nice round number like 10, but they just kept coming. Sorry.

I've been using SCSS/SASS for most of my styling work since 2009, and I'm a huge fan of Compass (by the great @chriseppstein). It really helped many of us through the darkest cross-browser crap. Even though browsers are increasingly playing nice with CSS, another problem has become very topical: managing the complexity in stylesheets as our in-browser apps get larger and larger. SCSS is an indispensable tool for dealing with this.

This isn't an introduction to the language by a long shot; many things probably won't make sense unless you have some SCSS under your belt already. That said, if you're not yet comfy with the basics, check out the aweso

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import React from 'react'
import curry from 'lodash.curry'

function withErrorHandler(errorCallback, FallbackComponent, Component) {
  return class extends React.Component {
      constructor() {
        super()

        this.state = {
          hasError: false,