Bracket Expression

typedef

`[key]`

Evaluates key and looks up the result in the scope.

{{[key]}}

Parameters

key {Literal Expression|KeyLookup Expression|Call Expression|Helper Expression}:
A Literal, KeyLookup, Call, or Helper expression to evaluate and look up the result in the scope.

`CALL_EXPRESSION[key]`

Evaluates key and looks up the result in the return value of CALL_EXPRESSION.

{{method()[key]}}

Parameters

CALL_EXPRESSION {Call Expression|Helper Expression|KeyLookup Expression}:
A Call, Helper, or KeyLookup expression that may or may not return a value.
key {Literal Expression|KeyLookup Expression|Call Expression|Helper Expression}:
A Literal, KeyLookup, Call, or Helper expression to evaluate and look up the result in the result of CALL_EXPRESSION.

Use

A bracket expression can be used to look up a dynamic property in the scope. This looks like:

Template:
    <h1>{{[key]}}</h1>

Data:
    {
        key: "name",
        name: "Kevin"
    }

Result:
    <h1>Kevin</h1>

This can be useful for looking up values using keys containing non-alphabetic characters:

Template:
    <h1>{{["person:name"]}}</h1>

Data:
    {
        "person:name": "Kevin"
    }

Result:
    <h1>Kevin</h1>

Bracket expressions can also be used to look up a value in the result of another expression:

Template:
{{getPerson()[key]}}

Data:
    {
        key: "name",
        getPerson: function() {
            return {
                name: "Kevin"
            };
        }
    }

Result:
    <h1>Kevin</h1>