index.js

const fs = require('fs');
const { parse } = require('csv-parse');

const habitablePlanets = [];

function isHabitablePlanet(planet) {
  return planet.koi_disposition === 'CONFIRMED'
    && planet.koi_insol > 0.36 && planet.koi_insol < 1.11
    && planet.koi_prad < 1.6;
}

fs.createReadStream('kepler_data.csv')
  .pipe(parse({
    comment: '#',
    columns: true,
  }))
  .on('data', (data) => {
    if (isHabitablePlanet(data)) {
      habitablePlanets.push(data);
    }
  })
  .on('error', (err) => {
    console.log(err);
  })
  .on('end', () => {
    console.log(habitablePlanets.map((planet) => {
      return planet.kepler_name;
    }));
    console.log(`${habitablePlanets.length} habitable planets found!`);
    console.log('done');
  });