djanowski

function useMatchMedia(query) {
  const mediaQuery = useMemo(() => window.matchMedia(query), [ query ]);
  const [ matches, setMatches ] = useState(mediaQuery.matches);

  useEffect(() => {
    function onChange({ matches: newMatches }) {
      setMatches(newMatches);
    }

    if (mediaQuery.addEventListener)

djanowski

// Throttles an async function.
function throttleAsync(fn, wait) {
  let lastRun    = 0;
  let currentRun = null;

  async function throttled(...args) {
    if (currentRun)
      return currentRun;

    const currentWait = lastRun + wait - Date.now();

djanowski

// Concurrently transform a MongoDB cursor into a stream of bulk MongoDB updates.
//
// Usage:
//
// const users         = db.collection('users');
// const usersToUpdate = users.find({ email: null });
//
// await eachAsyncUpdate(users, usersToUpdate, async function(user) {
//   const userEmail = await findUserEmail(user);
//

djanowski

AL America/Chicago
AK America/Anchorage
AS Pacific/Samoa
AZ America/Denver
AR America/Chicago
CA America/Los_Angeles
CO America/Denver
CT America/New_York
DE America/New_York
DC America/New_York

djanowski

#!/usr/bin/env bash

# Monitors your tree and runs tests when anything changes.
#
# `make`, `yarn test`, etc. automatically detected.
#
#   $ autotest
#
# Run a specific command on changes:
#

djanowski

#!/usr/bin/env bash

# Monitors your tree and runs tests when anything changes.
#
# `make`, `yarn test`, etc. automatically detected.
#
#   $ autotest
#
# Run a specific command on changes:
#

djanowski

#!/usr/bin/env bash

# Monitors your tree and runs tests when anything changes.
#
# `make`, `yarn test`, etc. automatically detected.
#
#   $ autotest
#
# Run a specific command on changes:
#

djanowski

const Mongoose = require('mongoose');

Mongoose.Promise = Promise;
Mongoose.connect(`mongodb://localhost/test-${Date.now()}`);

const PersonSchema = new Mongoose.Schema({
  name: {
    first: { type: String },
    last:  { type: String }
  }

djanowski

#!/usr/bin/env bash

# `nvm use` the version specified in package.json.

source $(brew --prefix nvm)/nvm.sh

set -eo pipefail

die() {
  echo "$@" >&2

djanowski

#!/usr/bin/env bash

# Monitors your tree and runs tests when anything changes.
#
# Run `make`, `npm test`, etc. automatically detected.
#
#   $ autotest
#
# Run a specific command on changes:
#