20190619 JescanellasScript 3 occurences

//not working script

function numcharsbetweenocc2and3ofApple() {

var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Sheet2");

var array = ['apple', 'apple', 'apple'];
var element = 'apple';
var idx = array.indexOf(element);

var string1 = sheet.getRange(2, 2).getValues().toString();


var apple_length1 = element.length;
var first_apple1 = string1.indexOf(element) + apple_length1;
var second_apple1 = string1.indexOf(element, first_apple1);
var third_apple = string1.indexOf(element, second_apple1);


var result1 = third_apple - second_apple1;

if (string1 !== "") {
      sheet.getRange(2, 3).setValue(result1);
    }


}