JavaScript – Higher Functions – Ameerpet Technologies

Explain Higher Order Functions in JavaScript: Functions that operate on other functions, either by taking them as arguments or by returning them, are called higher-order functions.

Function takes function as argument:

<html>
            <body>
                        <script>
                                    function abc() {
                                                document.write(“Hello world”)
                                    }
                                    function higherOrder(xyz) {
                                                xyz();
                                    }
                                    higherOrder(abc);
                        </script>
            </body>
</html>

Function returning function:

<html>
            <body>
                        <script>
                                    function abc() {
                                                document.write(“Hello”);
                                    }
                                    function higherOrder() {
                                                return abc;
                                    }
                                    xyz = higherOrder();
                                    xyz()
                        </script>
            </body>
</html>

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