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index.js
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index.js
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const { parse } = require('csv-parse');
const fs = require('fs');
const habitablePlanets = [];
// to filter records
function isHabitable(planet) {
return planet['koi_disposition'] === 'CONFIRMED'
&& planet['koi_insol'] > 0.36 && planet['koi_insol'] < 1.11
&& planet['koi_prad'] < 1.6;
}
// Reading data from csv file
// readable.pipe(writeable)
fs.createReadStream('kepler_data.csv')
.pipe(parse({
comment: '#', // signifies that the comments are declared using the pound symbol in the csv file
columns: true, // signifies that the data should be javascript object instead of an array
}))
.on('data', (data) => {
if (isHabitable(data)) habitablePlanets.push(data);
})
.on('error', (err) => {
console.log(err);
})
.on('end', () => {
console.log(habitablePlanets.map((planet) => { // to display only the names of the habitable planets that we've found
return planet['kepler_name'];
}))
console.log(`${habitablePlanets.length} habitable planets found!`);
});