covidcountystats.js

const {StringStream} = require('scramjet');
const request        = require('request');

// requires two arguments (county and state) which must be wrapped in quotes if a phrase i.e. 'new york city' 'new york'
let counter = 0;
let death = 0;
let cases = 0;
let args = process.argv;
do {
  args.shift();
  counter++;
} while (counter < 2);
counter = 0;

// fetch csv (via request, not actually fetch)
request.get('https://raw.githubusercontent.com/nytimes/covid-19-data/master/us-counties.csv')
  // pass to stream
  .pipe(new StringStream())
  // parse into objects
  .CSVParse()
  // handle incoming rows
  .consume(obj => {
    // log header
    if (counter === 0) {
      let header = '';
      obj.forEach(elem => header += elem + ' ');
      console.log(header); }
    counter++;
    // log rows matching criteria
    if (
      args.length >= 2
      && obj[1].toLowerCase() === args[0].toLowerCase() // match county
      && obj[2].toLowerCase() === args[1].toLowerCase() // match state
    ) {
      // build result string
      let result = '';
      obj.forEach(elem => result += elem + ' ');
      let caseItem = obj[obj.length -2];
      if (caseItem !== 0 && cases !== 0) {
        diffc = caseItem - cases;
        centc = Math.round(diffc / cases * 100);
        if (centc > 0) {
          result += 'Cases: ' + Math.round(diffc / cases * 100) + '% ';
        }
      }
      cases = caseItem;
      let lastItem = obj[obj.length -1];
      if (lastItem !== 0 && death !== 0) {
        diffd = lastItem - death;
        centd = Math.round(diffd / death * 100);
        if (centd > 0) {
          result += 'Death: ' + Math.round(diffd / death * 100) + '%';
        }
      }
      death = lastItem;
      // log result
      console.log(result);
    }
  })
  // .then(() => console.log('all done'))