Function Fold

docs/app/js/sanddance-app.js:117403–117405

* Folds one more tuple fields into multiple tuples in which the field * name and values are available under new 'key' and 'value' fields. * @constructor * @param {object} params - The parameters for this operator. * @param {function(object): *} params.fields - An array of field accessors * fo

(params)

 * @param {Array<string>} [params.as] - Output field names for folded key
 *   and value fields, defaults to ['key', 'value'].
 */ function Fold(params) {
    (0, _vegaDataflow.Transform).call(this, [], params);
}
Fold.Definition = {
    "type": "Fold",
    "metadata": {