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A named reference to a value in the scope or helper scope in a template.
key
Looks up a value in the scope or helper scope. This results in a KeyLookup Expression. KeyLookup Expression expressions can provide different values depending on what type of expression they are within. These rules are detailed in KeyLookup Expression.
{{name}}
{{#canVote(age)}}
EXPRESSION.key
Looks up key on the result of a subexpression EXPRESSION.
{{person.first.name}}
{{#if(tasks.completed().length)}} ... {{/if}}
a\\.single\\.key
Looks up a value without reading intermediate properties.
{{meta\\.data}}
This is deprecated. If you do have properties with dots in them, use a Bracket Expression:
{{["meta.data"]}}
Use
A key references a value within the scope of a
template being rendered. In the following example, the
key is name:
<h1>{{name}}</h1>
If this template is rendered with:
{
name: "Austin"
}
The template writes out:
<h1>Austin</h1>
A scope is a collection of multiple contexts. By default, a key walks up the scope to each context until it finds a value. For example, a template like:
{{first}} {{last}}
{{#children}}
{{first}} {{last}}
{{/children}}
Rendered with:
{
first: "Barry", last: "Meyer",
children: [
{first: "Kim", last: "Sully"},
{first: "Justin"},
]
}
Writes out:
Barry Meyer
Kim Sully
Justin Meyer
When last is looked up on the {first: "Justin"} object and not found,
it will then try to read the parent context’s last property. This is
why "Justin Meyer" is written out.