Method _normalize_trace_indexes

js/src/widget.ts:557–567

* Input a trace index specification and return an Array of trace * indexes where: * * - null|undefined -> Array of all traces * - Trace index as Number -> Single element array of input index * - Array of trace indexes -> Input array unchanged * * @param {undefined|null|Number

(trace_indexes?: null | number | number[])

   * @private
   */
  _normalize_trace_indexes(trace_indexes?: null | number | number[]): number[] {
    if (trace_indexes === null || trace_indexes === undefined) {
      var numTraces = this.model.get("_widget_data").length;
      trace_indexes = _.range(numTraces);
    }
    if (!Array.isArray(trace_indexes)) {
      // Make sure idx is an array
      trace_indexes = [trace_indexes];
    }
    return trace_indexes;
  }

  /**
   * Log changes to the _widget_data trait