How to check a string in a array in java script

How to check a string within a array using javascript. I am getting error in if statement. I need to verify that a string or index of a string in present in array.

  var arraylist=new ReadExcel();
  var TotalArray=arraylist.myarray;

   var objcid=new getObjectId(tblTestStepId);
   var TestSuiteNo = objcid.getTestSuiteNo;

  if(TotalArray.indexOf(TestSuiteNo)>=-1)
  {
  Log.Message("Hello")
  }