const vpc = new gcp.compute.Network("main", {
        autoCreateSubnetworks: false,
});



// our table of networks to create
const networks : {[name : string]: PartialExcept<gcp.compute.SubnetworkArgs, 'ipCidrRange'>} = {
   "gke01-london": {
      ipCidrRange: "10.0.1.0/26",
      privateIpGoogleAccess: true,
   }
};


// default values 
const defaultSubnetArgs: PartialExcept<gcp.compute.SubnetworkArgs, 'region'|'network'> = {
        region: "eu-west2", // london
        network: vpc.selfLink,
        privateIpGoogleAccess: false,
};

let results : { [name : string]: gcp.compute.Subnetwork } = {};

for (const name in networks) {
     results[name] = new gcp.compute.Subnetwork(name, {...defaultSubnetArgs, ...networks[name]})  // compiler can verify that second argument matches desired interface, even if individual values it was assembled from dont
};