/* global Plotly:false */

(function() {

var jsonURL = "https://plot.ly/~etpinard/7197/north-america-precipitation.json";

Plotly.d3.json(jsonURL, function(err, plotlyFig) {
    var trace = plotlyFig.data[0], 
        lon = str2Number(trace.lon),
        lat = str2Number(trace.lat),
        val = str2Number(trace.marker.color);
    
    answer(lon, lat, val);
})

function str2Number(arrayIn) {
    return arrayIn.map(function(x) { return +x; });
}

/**
 * @param {array} lon array of longitudes
 * @param {array} lat array of latitudes
 * @param {array} val array of scalers
 *
 * All three arrays have the same length.
 *
 */
function answer(lon, lat, val) {

    /* write up your answer here */

}

})();