How to use the @polkadot/extrinsics/codec/encode/length function in @polkadot/extrinsics

extrinsics.map((extrinsic) =>
      uncheckedLength(extrinsic)
    )

const result = extrinsics.reduce((result, extrinsic) =>
    result && executor(encodeLength(extrinsic)).bool, true);

export default function applyExtrinsic (self: ExecutorState, extrinsic: UncheckedRaw): boolean {
  const start = Date.now();

  self.l.debug(() => 'Apply extrinsic');

  const result = call(self, 'apply_extrinsic')(
    encodeLength(extrinsic)
  );

  self.l.debug(() => `Apply extrinsic completed (${Date.now() - start}ms)`);

  return result.bool;
}

extrinsics.map((extrinsic) =>
        uncheckedLength(extrinsic)
      )