Use d3.queue() to fetch data before using it

js/main.js

@@ -1,24 +1,142 @@
 "use strict";
 console.log("Main script running.");
 
-console.log("Let's load and preprocess all data properly.");
-
 // data/circuits.csv
-d3.csv('data/circuits.csv', function(data) {
-  console.log(data[0]);
-});
+function fetchCircuits(callback) {
+  d3.csv('data/circuits.csv', function(data) {
+    // TODO: process data
+    var circuits = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
 
 // data/constructorResults.csv
-// data/constructors.csv
-// data/constructorStandings.csv
-// data/drivers.csv
-// data/driverStandings.csv
-// data/lapTimes.csv
-// data/pitStops.csv
-// data/qualifying.csv
-// data/races.csv
-// data/results.csv
-// data/seasons.csv
-// data/status.csv
+function fetchConstructorResults(callback) {
+  d3.csv('data/constructorResults.csv', function(data) {
+    // TODO: process data
+    var constructorResults = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
 
-console.log("All done. Ready.");
+// data/constructors.csv
+function fetchConstructors(callback) {
+  d3.csv('data/constructors.csv', function(data) {
+    // TODO: process data
+    var constructors = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+// data/constructorStandings.csv
+function fetchConstructorStandings(callback) {
+  d3.csv('data/constructorStandings.csv', function(data) {
+    // TODO: process data
+    var constructorStandings = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+// data/drivers.csv
+function fetchDrivers(callback) {
+  d3.csv('data/drivers.csv', function(data) {
+    // TODO: process data
+    var drivers = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+// data/driverStandings.csv
+function fetchDriverStandings(callback) {
+  d3.csv('data/driverStandings.csv', function(data) {
+    // TODO: process data
+    var driverStandings = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+// data/lapTimes.csv
+function fetchLapTimes(callback) {
+  d3.csv('data/lapTimes.csv', function(data) {
+    // TODO: process data
+    var lapTimes = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+// data/pitStops.csv
+function fetchPitStops(callback) {
+  d3.csv('data/pitStops.csv', function(data) {
+    // TODO: process data
+    var pitStops = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+// data/qualifying.csv
+function fetchQualifying(callback) {
+  d3.csv('data/qualifying.csv', function(data) {
+    // TODO: process data
+    var qualifying = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+// data/races.csv
+function fetchRaces(callback) {
+  d3.csv('data/races.csv', function(data) {
+    // TODO: process data
+    var races = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+// data/results.csv
+function fetchResults(callback) {
+  d3.csv('data/results.csv', function(data) {
+    // TODO: process data
+    var results = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+// data/seasons.csv
+function fetchSeasons(callback) {
+  d3.csv('data/seasons.csv', function(data) {
+    // TODO: process data
+    var seasons = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+// data/status.csv
+function fetchStatus(callback) {
+  d3.csv('data/status.csv', function(data) {
+    // TODO: process data
+    var status = data;
+    callback(null); // Tell the queue we're done.
+  });
+}
+
+console.log("Let's load and preprocess all data properly.");
+
+// Create a queue, add all the fetch&process functions and await their results
+d3.queue()
+  .defer(fetchCircuits)
+  .defer(fetchConstructorResults)
+  .defer(fetchConstructors)
+  .defer(fetchConstructorStandings)
+  .defer(fetchDrivers)
+  .defer(fetchDriverStandings)
+  .defer(fetchLapTimes)
+  .defer(fetchPitStops)
+  .defer(fetchQualifying)
+  .defer(fetchRaces)
+  .defer(fetchResults)
+  .defer(fetchSeasons)
+  .defer(fetchStatus)
+  .await(function(error) {
+    console.log("All done. Ready.");
+    console.log(arguments);
+    if(error) throw error;
+  });