javascript-workshop-2023.april.01/exercise02.html at main · deepcloudlabs/javascript-workshop-2023.april.01 · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Exercise #2</title>
    <script type="text/javascript">
        const numbers = [4, 8, 15, 16, 23, 42];
        // even -> cube -> sum
        let sum = 0;
        for (let number of numbers){
            if (number%2 === 0){
                const cubed = number ** 3;
                sum += cubed;
            }
        }
        console.log(`sum is ${sum}.`);
        const even_numbers = n => n%2 === 0;
        const to_cube = u => u*u*u;
        const to_sum = (s,n) => s+n;
        // functional programming
        sum = numbers.filter(even_numbers)
                     .map( to_cube )
                     .reduce(to_sum, 0);
        console.log(`sum is ${sum}.`);
    </script>
</head>
<body>

</body>
</html>