(ArcGIS API for JavaScript) Break Renderer/Query in 3.x

Sample.js

require(["esri/map",
    "esri/layers/FeatureLayer",
    "esri/tasks/query",
    "esri/renderers/ClassBreaksRenderer",
    "esri/symbols/SimpleMarkerSymbol",
    "esri/Color",
    "dojo/domReady!"],
    function (Map, FeatureLayer, Query, ClassBreaksRenderer, SimpleMarkerSymbol, Color) {
  
        var featureLayer = new FeatureLayer("url to feature layer", {
            mode: FeatureLayer.MODE_SNAPSHOT,
            outFields: ["*"]
        });

        var query = new Query();
        query.outFields = ["*"];
        query.where = "randNum > 1";

        featureLayer.queryFeatures(query, function (results) {
            //console.log(results);
            var numArr = [];
            results.features.forEach(function (element) {
                //console.log(element.attributes.randNum);
                numArr.push(element.attributes.randNum);
            }, this);

            //console.log(numArr);
            var largest = Math.max.apply(Math, numArr); // 306
            console.log(largest);

            var symbol = new SimpleMarkerSymbol();
            symbol.setColor(new Color([150, 150, 150, 0.5]));
            var Myrenderer = new ClassBreaksRenderer(symbol, "randNum");
            Myrenderer.addBreak(0, largest, new SimpleMarkerSymbol().setColor(new Color([56, 168, 0, 0.5])));
            //featureLayer.renderer = Myrenderer;

        });

        //Initializing the map constructor
        var map = new Map("map", {
            center: [-118, 34.5],
            zoom: 8,
            basemap: "topo"
        });
        map.addLayer(featureLayer);

    });