Why does the add-function have to be outside of the main-function?

I finally got it to work in Chrome.

2 questions:
a) It seems that it is required to define the “add” function outside of the main function. Not sure why this is the case.
b) Why do we have to use an if(annyang) statement? What exactly is tested? Whether annyang is loaded as a source in html-header?

 var template = function(text) {
 	return '<p><input type="checkbox"><i class="glyphicon glyphicon-star"></i><span>' + text + '</span><i class="glyphicon glyphicon-remove"></i></p>';
 var add = function(item) {
 	var html = template(item);
 var main = function() {
 	$('form').submit(function() {
 		var todo = $('#todo');
 		if (todo.val() !== "") {
 			var html = template(todo.val());
 		return false;
 	$(document).on("click", '.glyphicon-remove', function() {
 	$(document).on("click", '.glyphicon-star', function() {
 	if (annyang) {
 		var commands = {
 			'add *item': add,

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