Example usage of Handlebars.registerHelper("foreach"... from http://stackoverflow.com/a/12002281/194105

function

Handlebars.registerHelper("foreach",function(arr,options) {
    if(options.inverse && !arr.length)
        return options.inverse(this);

    return arr.map(function(item,index) {
        item.$index = index;
        item.$first = index === 0;
        item.$last  = index === arr.length-1;
        return options.fn(item);
    }).join('');
});

usage

  <div class="carousel-inner">
		{{#foreach photos}}
		<div class="item {{#if $first}} active {{/if}}">
			<div class="thumbnail">
				<a href="{{url}}" target="_blank">
					<img alt="{{title}}" src="{{url}}">
				</a>
			</div>
		</div>
		{{/foreach}}
	</div>