Polygon object not drawing

Question

I'm trying to create an esri.geometry.Polygon using a JSON object as per the Javascript API reference. I'm creating the JSON object, and then referencing it in the creation of the polygon, just like in the API reference. I've copied the syntax exactly yet my polygon fails to draw.

My code is:
this is the polygon:
console.log(hullString); 
{"rings": [[[-73.7104093,40.54816076],[-73.7519722,40.5871111],[-73.7601326,40.61371559],[-73.7615556,40.8149722],[-73.7562433,40.8320452],[-73.7265199,40.86482226],[-73.6309606,40.8962101],[-73.5906812,40.90843197],[-73.5679025,40.91454289],[-73.3965069,40.9539866],[-71.9822949,41.2742658],[-71.85812147,41.07093545],[-71.85784367,41.0701021],[-71.8675662,41.0606577],[-71.8772889,41.05565774],[-71.91034587,41.04371326],[-72.044796,40.99537948],[-72.39814118,40.8689892],[-72.4800884,40.8420448],[-72.5287016,40.8267668],[-73.0403879,40.6720437],[-73.04316579,40.67121038],[-73.0576108,40.66732155],[-73.1362248,40.6473219],[-73.20219949,40.6340722],[-73.7104093,40.54816076],[-73.7104093,40.54816076]]],"spatialReference": {"wkid": 102100} }

this is where I create the polygon:
var polygon = esri.geometry.geographicToWebMercator(new esri.geometry.Polygon(hullString));

But the polygon is empty:
console.log(polygon);
Object { type="polygon", rings=[0], _ring=0, more...}

But if I copy the JSON string from the console, and paste that into:
 var polygon = esri.geometry.geographicToWebMercator(new esri.geometry.Polygon(paste above JSON here)); 
the polygon draws fine in my map.

This should be simple, I'm sure I'm overlooking something.

Traspac · Answer

It' WORK to me THANK YOU very much

RRubalcava · Answer

So is hullString still a string when you pass it in that last line? If it's a string and you don't want to worry about JSON.parse being available, you can still use the dojo/json module to parse it for you. 
http://dojotoolkit.org/reference-guide/1.7/dojo/json.html
You need to parse it one way or another to work.

MartynSmith · Answer

Derek Thanks for replying.  You are definitely right that I was using the wrong wkid, but changing it did not fix the problem in my app.

The issue is something to do with the formatting of my JSON string which I am building in a for loop.  If I use JSON.parse on the string it works fine (but I'd like to avoid that because of browser incompatibilities), or if I copy and paste the text of the string from the console log it works fine.  Any other ideas?

These work:
var jsonString = JSON.parse(hullString);
var polygon = esri.geometry.geographicToWebMercator(new esri.geometry.Polygon(jsonString));

var polygon = esri.geometry.geographicToWebMercator(new esri.geometry.Polygon({"rings": [[[-73.7104093,40.54816076],[-73.7519722,40.5871111],[-73.7601326,40.61371559],[-73.7615556,40.8149722],[-73.7562433,40.8320452],[-73.7265199,40.86482226],[-73.6309606,40.8962101],[-73.5906812,40.90843197],[-73.5679025,40.91454289],[-73.3965069,40.9539866],[-71.9822949,41.2742658],[-71.85812147,41.07093545],[-71.85784367,41.0701021],[-71.8675662,41.0606577],[-71.8772889,41.05565774],[-71.91034587,41.04371326],[-72.044796,40.99537948],[-72.39814118,40.8689892],[-72.4800884,40.8420448],[-72.5287016,40.8267668],[-73.0403879,40.6720437],[-73.04316579,40.67121038],[-73.0576108,40.66732155],[-73.1362248,40.6473219],[-73.20219949,40.6340722],[-73.7104093,40.54816076],[-73.7104093,40.54816076]]],"spatialReference": {"wkid": 4326} }));

This doesn't work:
var polygon = esri.geometry.geographicToWebMercator(new esri.geometry.Polygon(hullString));