With Blocks

{{#with}} blocks can be used to evaluate an expression and then generate a template block using the result of the expression.

If not specified, the expression gets assigned to a variable named item:

{{#with model.user.post[33].comments[1]}}
<p>{{item.text}}</p>
<p>Posted at: {{item.time}}</p>
{{/with}}

To specify the name of the variable inside use as, like so:

{{#with comment as model.user.post[33].comments[1]}}
<p>{{comment.text}}</p>
<p>Posted at: {{comment.time}}</p>
{{/with}}

The contents of a {{#with}} block only render if the expression evaluates to a "truthy" value, and they can have an optional {{#else}} block:

{{#with comment as model.user.post[33].comments[1]}}
<p>{{comment.text}}</p>
<p>Posted at: {{comment.time}}</p>
{{#else}}
<p>No Comment</p>
{{/with}}