Question

The following code works, but I’d like to use the self-invoking function syntax when declaring it instead of calling it explicitly on the last line:

var ShowMe = function() {
    if ($('input:checkbox:checked').length) {
        $('#Save').fadeIn('slow');
    } else {
        $('#Save').hide();
    }
};
$('input:checkbox').on('click',ShowMe);
ShowMe();

Answer 1

You can’t declare the var inside of an expression, but you can put its definition in one:

var ShowMe; (ShowMe = function() {
    if ($('input:checkbox:checked').length) {
        $('#Save').fadeIn('slow');
    } else {
        $('#Save').hide();
    }
})();

$('input:checkbox').on('click',ShowMe);