compare block helper for handlebars

gistfile1.js

// (from http://doginthehat.com.au/2012/02/comparison-block-helper-for-handlebars-templates/)
// Usage: {{#xIf a 'operator' b}} true {{else}} false {{/xIf}}
Handlebars.registerHelper('xIf', function(lvalue, operator, rvalue, options) {
	if (arguments.length < 3)
		throw new Error("Handlerbars Helper 'compare' needs 3 parameters");

	var operators = {
		'==':		function(l,r) { return l == r; },
		'===':		function(l,r) { return l === r; },
		'!=':		function(l,r) { return l != r; },
		'<':		function(l,r) { return l < r; },
		'>':		function(l,r) { return l > r; },
		'<=':		function(l,r) { return l <= r; },
		'>=':		function(l,r) { return l >= r; },
		'typeof':	function(l,r) { return typeof l == r; }
	}

	if (!operators[operator])
		throw new Error("Handlerbars Helper 'compare' doesn't know the operator "+operator);

	var result = operators[operator](lvalue,rvalue);

	if( result ) {
		return options.fn(this);
	} else {
		return options.inverse(this);
	}
});