Handlebars.js helpers to iterate over objects

handlebars.object_helpers.js

// HELPER: #key_value
//
// Usage: {{#key_value obj}} Key: {{key}} // Value: {{value}} {{/key_value}}
//
// Iterate over an object, setting 'key' and 'value' for each property in
// the object.
Handlebars.registerHelper("key_value", function(obj, options) {
    var buffer = "",
        key;

    for (key in obj) {
        if (obj.hasOwnProperty(key)) {
            buffer += options.fn({key: key, value: obj[key]});
        }
    }

    return buffer;
});

// HELPER: #each_with_key
//
// Usage: {{#each_with_key container key="myKey"}}...{{/each_with_key}}
//
// Iterate over an object containing other objects. Each
// inner object will be used in turn, with an added key ("myKey")
// set to the value of the inner object's key in the container.
Handlebars.registerHelper("each_with_key", function(obj, options) {
    var context,
        buffer = "",
        key,
        keyName = options.hash.key;

    for (key in obj) {
        if (obj.hasOwnProperty(key)) {
            context = obj[key];

            if (keyName) {
                context[keyName] = key;
            }

            buffer += options.fn(context);
        }
    }

    return buffer;
});