nybblr

function getCost(cell) {
  return cell.match(/\$[\d.,]+\d/)[0]
}

function getCondition(cell) {
  return cell.match(/((like )?new|used|mint|good|great|excellent)/i)[0]
}

function getEmail(cell) {
  return (cell.match(/[^\s@]+@[^\s@]+/i) || ['N/A'])[0]

nybblr

const intRegex = /^(0|[1-9]\d*)$/;

let isIndex = prop =>
  typeof prop === 'string'
  && intRegex.test(prop);

let concat = (left, right) => {
  let w = left.length;
  let h = right.length;

nybblr

let timer = (ms) => new Promise(resolve => setTimeout(resolve, ms));

let producer = async function*() {
  let counter = 0;
  while (true) {
    let delay = Math.random() * 1000;
    await timer(delay);
    yield counter++;
  }
};