How to use

selectWorkerGroup

function

in

Array

/**
  * Verify that the worker address is in the selected workers group for the given secret contract address
  * @param {string} secretContractAddress - Secret contract address
  * @param {string} workerAddress - Worker address
  * @param {JSON} params - task epoch params
  * @return {{isVerified: boolean, error: null}} : isVerified - true if the worker is in the selected group
  *                   err - null or Error Class
  */
 _verifySelectedWorker(secretContractAddress, workerAddress, params) {
  let result = { error: null, isVerified: true };
  let selectedWorker = EthereumVerifier.selectWorkerGroup(secretContractAddress, params, 1)[0];
  selectedWorker = nodeUtils.remove0x(selectedWorker.toLowerCase());
  if (selectedWorker !== workerAddress) {
   result.error = new errors.WorkerSelectionVerificationErr(
    "Not the selected worker for the " + secretContractAddress + " task"
   );
   result.isVerified = false;
  }
  return result;
 }