function innerJoin(){
        // Create array to return
        var arrToReturn = [];

        // Loop over usersHaveBooks
        for(var recordIdx = 0; recordIdx < usersHaveBooks.length; recordIdx += 1){
          // Creating miniArr that will hold record obj, userobj, and bookobj
          // initially just put the record obj we have access to inside
          var miniArr = [usersHaveBooks[recordIdx]]

          // Find correct user object
          var correctUserObj = findById(usersHaveBooks[recordIdx].user_id, users)

          // Find correct book object
          var correctBookObj = findById(usersHaveBooks[recordIdx].book_id, books)

          // Put user obj in miniArr
          miniArr.push(correctUserObj)
          // Put book obj in miniArr
          miniArr.push(correctBookObj)

          // ALTERNATE CODE CAN TAKE PLACE OF EVERYTHING ABOVE
          // var miniArr = [usersHaveBooks[recordIdx],findById(usersHaveBooks[recordIdx].user_id, users),findById(usersHaveBooks[recordIdx].book_id, books)];

          // If we're here, miniArr is completed and we can add to arrToReturn
          arrToReturn.push(miniArr)
        }

        return arrToReturn
      }

      function findById(providedId, records){
        // Use the id passed in to find the matching object in record
        for(var searchIdx = 0; searchIdx < records.length; searchIdx+=1){
          if ( records[searchIdx].id === providedId){
            return records[searchIdx];
          }
        }
        // If we get here, no record with providedId as id property
        return {error: "No record found"}

      }

      // JACK'S BETTER IDEA:
      // Create two objects:
        // Users object, Books object
        // {
        //   1: {object from array}
        // }

      console.dir(innerJoin())