<? php
add_shortcode('example', function( $atts ) {
    //extracting the shortcode attributes
    extract( shortcode_atts( array(
        'value1' => null,
        'value2' => null,
        'value3' => null
    ), $atts ) );

    //Now here I wll do my code for the shortcode
    // But the shortcode needs some js and css to work
    // so, I'm trying like this

});

add_action ('wp', 'add_shortcode_script');

function add_shortcode_script () {
  global $post;
if ( empty($posts) )
        return $posts;

    $flag = false;

    foreach ($posts as $post) {
        if ( stripos($post->post_content, '[EXAMPLE') )
            $flag = true;
            break;
        }

    if ($flag){

$custom_script = '<script type="text/javascript">
            var a = '. $value3 .'
        </script>';

$custom_style = '<style type="text/css">
            .class {
                background-color: '. $value2 .';
            }
        </style>';

// But I'm not sure how you propose to fetch the shortcode variables like $value2, $value3 here
wp_add_inline_script ('my_script', $custom_script);
  wp_add_inline_style ('my_style', $custom_stle);
    }
    return $posts;
}