Sort Datastores by free Space in a cluster

Hello, I am trying to sort the datastores on a cluster by the amount of freespace available so I can return the cluster and datastore to put a VM on so far I have this:

var datacenter = Server.findForType("VC:Datacenter", "vc06vc.lab.601travis.jpmchase.net/datacenter-22");

var clusters = datacenter.hostFolder.childEntity;

var hosts = new Array;

var dataStores = new Array;

var dataStoreMostFreeRank = new Array;

//System.log(clusters);

for each(VcComputeResource in clusters) {

var clusterName = VcComputeResource.name;

var datastore = VcComputeResource.datastore;

//dataStores.push(datastore);

System.log(clusterName + " " + dataStores);

for each(var i in datastore){

var dataStoreName = i.name;

var dataStoreFreeSpace = i.summary.freeSpace;

function sortDataStores(a,b){

return a.dataStoreFreeSpace - b.dataStoreFreeSpace

}

var dataStoreRank = new Arrary;

dataStoreRank.push(dataStoreFreeSpace);

dataStoreRank.sort(sortDataStores)

}

}

}

but I get a syntax error when I run it in vco cli