How do I use an IF statement with a condition from variableOne through VariableTwo?

Question

I'm having some trouble finding unique entries in a record set. This is what I have so far.

function project5Part1() {

// Variable Declarations

var zipCode;
var outputDiv;
var records;
var i;
var j;
var null1;
var array = new Array(0);
var count;



// Get the HTML output table so we can add rows
outputDiv = document.getElementById('outputDiv');

// Open the Zip Code Study Records and make them 
// available to the script
records = openZipCodeStudyRecordSet();


//Logic
while (records.readNextRecord()) {

    zipCode = records.getSampleZipCode();
    j = zipCode;
    count++;


        if (j === array[0 - count]) {
            j = null1;

        }else {
            array.push(j);
        }

    }





// Output the entire data table
outputDiv.innerHTML = array;

}

I'm still pretty new to coding in general, and I've been banging my head on a wall for hours over this.

I think I'm pretty close to getting the program to do what I want, but I can't figure out how to check an array from one variable to another (In this case 0 through count) or if it is even possible.

Please help. :(

Answer 1

I don't know if I understood the question right. Are you looking for something like this?

for(i = 0; i < count; i++){
    // do something with array element i
    alert(array[i]);
}

Answer 2

Just loop through the array from 0 to count:

for(var i=0; i<array.length; i++){
  if (j === array[i]) { ... }
}

Answer 3

Can you explain what you're trying to do a little more? First this code won't work:

array[0 - count]

You are trying to take a negative subscript of an array. Also, you should initialize count. Why are you subtracting count from 0?

Answer 4

Perhaps you can try this to prune duplicates from records:

var array = [];
while (records.readNextRecord()) {
    zipCode = records.getSampleZipCode();

    var duplicate = false;
    for (var i = 0; i < array.length; i++) {
        if (array[i] == zipCode) {
            duplicate = true;
            break; //do not check the rest of the array as zipCode is already a duplicate.

        }
    }
    if (!duplicate)
        array.push(zipCode);

}

Answer 5

It's sorting through a record set saved in another JS file. The record set is called ZipCodeStudyRecordSet(). There are about 900 total records in it, but only about 11 unique zip codes.

I need the program to sort through the zip codes, and add the unique zip codes to the array with array.push(j);.

The code above adds all the zip codes to the array, not just the unique ones.

The problem is in the if statement condition. what I want it to do is compare "j" to "array[0]" through "array[count]".

I'm not even sure if that's possible. If it isn't, how can I go about finding the unique zip codes in the record set?

Answer 6

Then this should work within the while loop.

var newZipCode = true;
for(i = 0; i < array.length; i++){
if(array[i] == zipCode){
    newZipCode = false;
}
}
if(newZipCode){
   array.push(zipCode);
}

Answer 7

Igor, your code works. <3!

Answer 8

hmm. How would I be able to check to see if the code has gotten all of the unique zip codes? I'm pretty sure it has, but I have to verify it and state how I verified it. The list is far to large to compare the results of the program to.