// Build the Random Forecaster app
var forecastNumber = getColumn("Daily Weather", "Forecast Number");
var city = getColumn("Daily Weather", "City");
var condition = getColumn("Daily Weather", "Condition Description");
var icon = getColumn("Daily Weather", "Icon");
var high = getColumn("Daily Weather", "High Temperature");
var low = getColumn("Daily Weather", "Low Temperature");

var filterCity =[];
var filterCondition =[];
var filterIcon =[];
var filterLow =[];
var filterHigh =[];

function filter() {
  for (var i = 0; i < city.length; i++) {
    if (forecastNumber[i] == 1) {
      appendItem(filterCity, city[i]);
      appendItem(filterHigh, high[i]);
      appendItem(filterLow, low[i]);
      appendItem(filterCondition, condition[i]);
      appendItem(filterIcon, icon[i]);
    }
  }
}
filter();
onEvent("forecastButton", "click", function( ) {
  var id = randomNumber(1, 499);
  setText("cityOutput", city[id]);
  setText("highTempOutput", high[id]);
  setText("lowTempOutput", low[id]);
  setText("conditionOutput", condition[id]);
  setImageURL("iconOutput", icon[id]);
});