Extending using jQuery

JQuery.fn.extend() method actually extends the jQuery prototype ($.fn) object to provide new methods which can be chained to JQuery. For e.g- After searching the elemnts using Jquery,  I want to call my custom methods that too with chaining, in that case I will extend it.

<label>
        <input type="checkbox" name="foo" />
        Foo</label>
    <label>
        <input type="checkbox" name="bar" />
        Bar</label>
    <script type="text/javascript">
        jQuery.fn.extend({
            check: function () {
                return this.each(function () {
                    this.checked = true;
                    alert('f');
                });
            },
            uncheck: function () {
                return this.each(function () {
                    this.checked = false;
                });
            }
        });

        $("input[type='checkbox']").check();

    </script>

Hope this helps you.