config: new "reverse" interpolation function #18887
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First PR on Terraform. This is useful for
Assuming you want it in ascending order, you need to reverse the list. for_each may solve this, but for existing terraform configurations, this is invaluable. |
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Hi @sargun! Thanks for working on this. The implementation here looks good to me. The interpolation functions are frozen for the moment while we complete some refactoring in preparation for the 0.12 release, so we'll need to hold on merging this for a little while, but I've labelled this so we'll find it again during our 0.12 release preparation. The way functions are defined will be changing once we complete this refactoring, so this PR will need some changes to adapt to the new style but we'd be happy to do that step at merge time since it'll just be the same mechanical updates we'll be doing for a number of other pending function pull requests. Thanks again! We'll be back here to merge this as we get closer to the 0.12 release. |
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@apparentlymart Sounds good. Thanks for taking a look at it. Is there a rough timeline as to 0.12 yet? |
| inputList := args[0].([]ast.Variable) | ||
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| reversedList := make([]ast.Variable, len(inputList)) | ||
| for idx := range inputList { |
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One could say that you could iterate over len(inputList) /2 and do swaps:
example pseudocode
r := make([]ast.Variable, len(inputList))
copy(r, inputList)
for i, j := 0, len(r)-1; i < len(r)/2; i, j = i+1, j-1 {
r[i], r[j] = r[j], r[i]
}
return r, nil
It reverses a list.
This has the same functionality as the "reverse" function that was implemented in the "config" package, but adapted to the new language type system.
apparentlymart
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It reverses a list.