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while (studentRecords.readNextRecord()) {
    currentZipCode       =  studentRecords.getStudentZipCode();
    currentGender        =  studentRecords.getStudentGender();

    if (currentZipCode === FIRST_ZIPCODE) {
        if (currentGender === "M")
        document.write("53711: Males: " + currentGender + "<br />");
    }
}

How can I add all the M's together to produce 53711: Males: 5??

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  • are you asking for how to count all record having currentGender == M then display it? Commented Nov 21, 2015 at 18:41

1 Answer 1

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Keep a running count, and don't output the total until you're done with the loop.

var males = 0;

while (studentRecords.readNextRecord()) {
  currentZipCode       =  studentRecords.getStudentZipCode();
  currentGender        =  studentRecords.getStudentGender();

  if (currentZipCode === FIRST_ZIPCODE) {
    if (currentGender === "M") {
      ++males;
    }
  }
}

document.write("53711: Males: " + males + "<br />");
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