<div>
    <input type="checkbox" checked="{{foo}}">

    <div class='{{ (concat "foo" " " (if foo "a" "b")) }}'>A</div>
    <div class='{{ (concat "foo" " " (if foo "a" "b")) }}'>A</div>

    {{ (call aModel.foo 'toUpperCase') }}
    {{ (call things 'join') }}
    {{ (apply things 'join' joinArgs) }}

    {{#if (not (not foo))}}
        <a>hi</a>
    {{#else}}
        <b>there</b>
    {{/if}}
</div>
