Web APIs with Express Drills

gistfile1.txt

//Drill 1
app.get('/sum', (req, res) => {
    const a = parseInt(req.query.a);
    const b = parseInt(req.query.b);
    if(!a || !b) {
        res.send('Please send 2 numbers');
    } else {
    res.send(`The sum of ${a} and ${b} is ${a+b}`)
    }
})

//Drill 2
app.get('/cipher', (req, res) => {
    const text = req.query.text;
    const shift = parseInt(req.query.shift);
    
        if(text==='' || !text) {
            res.status(400).send('Please enter a String')
        }
        if(!parseInt(shift)) {
            res.status(400).send('Please enter a number')
        }


        const shifted = text.toUpperCase().split('').map(letter => {
        if(letter.charCodeAt(0)+shift>91) {
            return String.fromCharCode(65+(letter.charCodeAt(0)+shift-91))
        } 
        else{
            return String.fromCharCode(letter.charCodeAt(0)+shift)
        } 
    })
    res.send(shifted);
})

//Drill 3
app.get('/loto', (req, res) => {
    const {numbers} = req.query
    const guess = numbers.map((index) => parseInt(index))
    const randomNumbers = []
    for(let i = 0; i<6; i++){
        if(!numbers[i]) {
            res.send('Please enter 6 numbers');
        }
        if(numbers[i] > 20 || numbers[i] < 0){
            res.send('Please pick numbers between 1 and 20')
        } else{
        randomNumbers.push(Math.floor((Math.random() * 20) + 1));
        }
    }
    let check = randomNumbers.filter((num) => !guess.includes(num))
    // console.log(guess, randomNumbers, check)
    let responseText;
    switch(check.length){
        case 0: 
          responseText = 'Wow! Unbelievable! You could have won the mega millions!';
          break;
        case 1:   
          responseText = 'Congratulations! You win $100!';
          break;
        case 2:
          responseText = 'Congratulations, you win a free ticket!';
          break;
        default:
          responseText = 'Sorry, you lose';  
      }
    res.send(responseText);
})