Error in Traversal Make activity

CS Principles
1

My students keep getting an error on line 35/36 in the Traversal Make app. I can’t find anything wrong with the code, can someone help?
Link to code:

Code:
// Build the Random Forecaster app
var cityList = [getColumn(“Daily Weather”, “City”)];
var forecastNumberList = [(getColumn(“Daily Weather”, “Forecast Number”))];
var conditionList = [getColumn(“Daily Weather”, “Main Condition”)];
var highTempList = [getColumn(“Daily Weather”, “High Temperature”)];
var lowTempList = [getColumn(“Daily Weather”, “Low Temperature”)];
var iconList = [(getColumn(“Daily Weather”, “Icon”))];

var filteredCityList = ;
var filteredConditionList = ;
var filteredHighTempList = ;
var filteredLowTempList = ;
var filteredIconList = ;

getTomorrowsWeather();
var tomorrowsWeather = 2;

onEvent(“forecastButton”, “click”, function( ) {
updateScreen();
});

function getTomorrowsWeather() {
for (var i = 0; i < forecastNumberList.length; i++) {
if (forecastNumberList[i] == tomorrowsWeather) {
appendItem(filteredCityList, cityList[i]);
appendItem(filteredConditionList, conditionList[i]);
appendItem(filteredHighTempList, highTempList[i]);
appendItem(filteredLowTempList, lowTempList[i]);
appendItem(filteredIconList, iconList[i]);
}
}
}

function updateScreen() {
var index = randomNumber(0, filteredCityList.length - 1);
setText(“highTempOutput”, filteredHighTempList[index]);
setText(“conditionOutput”, filteredConditionList[index]);
setText(“lowTempOutput”, filteredLowTempList[index]);
setProperty(“iconOutput”, “image”, filteredIconList[index]);
setText(“cityOutput”, filteredCityList[index]);
}

2

When you use the getColumn block it actually creates a list. Your students code is creating a list and adding the column as the first element of the list (meaning the entire column is in the first element. They need to remove the surrounding the getColumn statements. There is also currently a glitch with the Code.org datasets.

var cityList = getColumn(“Daily Weather”, “City”);
var forecastNumberList = getColumn(“Daily Weather”, “Forecast Number”);
var conditionList = getColumn(“Daily Weather”, “Main Condition”);
var highTempList = getColumn(“Daily Weather”, “High Temperature”);
var lowTempList = getColumn(“Daily Weather”, “Low Temperature”);
var iconList = getColumn(“Daily Weather”, “Icon”);

3

Thank you so much! I appreciate the help.