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Try this:

```vpc.publicSubnetIds.apply(ids =&gt; {
  ids.forEach(id =&gt; {
     gateways[id] = vpc.addNatGateway(
        `${config.release.name}-${name}-${id}-gateway`,
        { subnet: id },
        { parent: vpc }
      );
  });
});```


unfortunately subnetids is an array of output string not a output of string array

I need to flip the onion, but my ts foo is not that strong

Ah I see, how about using `pulumi.all()`?

```pulumi.all(vpc.publicSubnetIds).apply((ids) =&gt; {
  ids.forEach(id =&gt; {
     gateways[id] = vpc.addNatGateway(
        `${config.release.name}-${name}-${id}-gateway`,
        { subnet: id },
        { parent: vpc }
      );
  });
});```
