Programming for beginners: JavaScript: unshift: Add an element to the front of array

Unshift function is used to add an element to the front of the array.

Syntax

arryNam.unshift(element);

array.html

<!DOCTYPE html>

<html>

<head>
    <title>Array</title>
</head>

<body>
    <script type="text/javascript">
        var array = [];

        function printArray(arr) {
            document.write("<br />Elements in Array are : ");
            for (var i = 0; i < arr.length; i++) {
                document.write(arr[i] + " ");
            }
            document.write("<br />");
        }

        printArray(array);

        document.write("<br />Appending element");
        array.unshift(2);
        printArray(array);

        document.write("<br />Appending element");
        array.unshift(3);
        printArray(array);

        document.write("<br />Appending element");
        array.unshift(5);
        printArray(array);

        document.write("<br />Appending element");
        array.unshift(7);
        printArray(array);
    </script>
</body>

</html>

Open above page in browser, you can able to see following data.

Elements in Array are :

Appending element

Elements in Array are : 2

Appending element

Elements in Array are : 3 2

Appending element

Elements in Array are : 5 3 2

Appending element

Elements in Array are : 7 5 3 2

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Programming for beginners

Sunday, 2 September 2018

JavaScript: unshift: Add an element to the front of array

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