server.js

const express = require('express');
const app = express();

app.get('/', (request, response) => {
    response.send('hello! i work');
});

app.get('/flip-coin', (request, response) => {
    const randomNumber = Math.random();
    let coinValue = '';
    if (randomNumber < 0.5) {
        coinValue = 'Heads!';
    } else {
        coinValue = 'Tails!';
    }
    response.send(coinValue);
});

app.get('/flip-coins', (request, response) => {
    const times = request.query.times;
    if (times && times > 0) {
        let heads = 0;
        let tails = 0;
        for (let i = 0; i < times; i++) {
            const randomNumber = Math.random();
            if (randomNumber < 0.5) {
                heads++;
            } else {
                tails++;
            }
        }
        response.json({ heads, tails });
    } else {
        response.send('hey! you need to send times!');
    }
});

app.listen(5010, () => {
    console.log('started server. listening on port 5010.');
});