choonkending

const events = [ 'domLoading', 'domInteractive', 'domContentLoadedEventEnd', 'domComplete', 'loadEventEnd' ];
const startEvent = 'navigationStart';

const timing = performance.timing;

const compose = (f, g) => x => f(g(x));

const timeFromNavigationStart = event => differenceInSeconds(timing[event], timing[startEvent]);
const differenceInSeconds = (t1, t2) => (t1 - t2) / 1000;
const sanitizeTime = t => (t > 0) ? t : 'N/A - Has not fired yet - please run console log again';

choonkending

{
  "listing": {
    "features": {
      "bedrooms": {
        "value": 3
      }
    }
  }
}

choonkending

const Features = ({ bedrooms, bathrooms }) => (
  <div>
    <span>Beds: </span><span>{ bedrooms }</span>
    <span>Baths: </span><span>{ bathrooms }</span>
  </div>
);

choonkending

const ComponentThatWrapsFeatures = ({ data }) => {
  const features = getFeatures(data);
  return features && <Features {...features} />
};

choonkending

const Option = x => (x === undefined || x === null) ? None : Some(x);

const Some = x => ({
  map: f => Some(f(x)),
  flatMap: f => f(x),
  fold: (ifEmpty, f) => f(x)
});

const None = {
  map: f => None,

choonkending

const getBedrooms = data =>
    Option(data.listing)
        .flatMap(listing => Option(listing.features))
        .flatMap(features => Option(features.bedrooms))
        .map(bedrooms => bedrooms.value)
        .fold(() => 0, v => v);
   

choonkending

const Left = x => ({
  map: f => Left(x),
  fold: (ifLeft, ifRight) => ifLeft(x)
});

const Right = x => ({
  map: f => Right(f(x)),
  fold: (ifLeft, ifRight) => ifRight(x)
});

choonkending

const getUserFromLocalStorage = keyName => {
  const str = localStorage.getItem(keyName);
  return JSON.parse(str);
};

choonkending

const doSomethingWithUserData = () => {
  const cage = getUserFromLocalStorage('cage');
  // do wonderful things
};

choonkending

const getUserFromLocalStorage = keyName => {
  const str = localStorage.getItem(keyName);
  try {
    return JSON.parse(str);
  } catch (e) {
    return "Invalid or Corrupted User Data";
  }
};