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`for (let i = 0; i &lt; pulumi.output(subnets).apply(x =&gt; x.length); i++ ) {`
    `// do something with subnets[i]`
`}`

```pulumi.output(subnets).apply(subnets =&gt; {
  for (let i = 0; i &lt; subnets.length; i++ ) {
    // do something with subnets[i]
  }
})```
this should work

`apply&lt;U&gt;(func: (t: T) =&gt; Promise&lt;U&gt;): Output&lt;U&gt;` it's still an output outside the callback
&gt; The result remains a Output so that dependent resources can be properly tracked.