Javascript example

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/3.0.3/handlebars.min.js"></script>
<script id="course-template" type="text/x-handlebars-template">
    <div>
    {{#each levels}}

            {{../curr_level}} == {{@index}}

            {{#ifeq ../../curr_level @index}}yes{{else}}no{{/ifeq}}

    {{/each}}
</div>
</script>

JavaScript

Handlebars.registerHelper('ifeq', function(val1, val2, options) {
    console.log("if equal", val1, typeof(val1), val2, typeof(val2));
    if (val1 == val2){
        return options.fn(this);
    }
    return options.inverse(this);
});

var source = $("#course-template").html(); 
var template = Handlebars.compile(source); 

var data = {
    "curr_level": 0,
    "levels" : ["A", "B", "B"]
};

var htmlOut = template(data);
$("body").html(htmlOut);