javascript-highest-order-function-examples/index.html at master · didinj/javascript-highest-order-function-examples · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Higher Order Function</title>
</head>

<body>
    <!-- Filter -->
    <!-- <script>
        const numbers = [-4, 9, 4, -1, -5, 8, 2, 3, -9];

        // const newNumbers = numbers.filter(function (n) {
        //     return n >= 3;
        // });

        // filter with arrow function
        const newNumbers = numbers.filter(n => n >= 3);

        console.log(newNumbers);
    </script> -->

    <!-- Map -->
    <!-- <script>
        const numbers = [-4, 9, 4, -1, -5, 8, 2, 3, -9];

        const newNumbers = numbers.map(n => n * 2);

        console.log(numbers);
        console.log(newNumbers);
    </script> -->

    <!-- Reduce -->
    <!-- <script>
        const numbers = [-4, 9, 4, -1, -5, 8, 2, 3, -9];

        const newNumber = numbers.reduce((accumulator, currentValue) => accumulator + currentValue);

        console.log(newNumber);
    </script> -->

    <!-- Chaining -->
    <script>
        const numbers = [-4, 9, 4, -1, -5, 8, 2, 3, -9];

        const total = numbers.filter(n => n > 3) // will return 9, 4, 8
            .map(n => n * 2) // will return 18, 8, 16
            .reduce((accum, current) => accum + current); // will return 42

        console.log(total);
    </script>
</body>

</html>