Add more functions (sum, round, map, …)

[lindhe]

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Description

I'm missing some numerical functions, such as round() and sum(). If you can come up with more functions, please add those to my list! The more the merrier, at least when it comes to functions.

A map function would also be extremely useful.

Use Case(s)

I think there are plenty of use-cases for sum(). In my particular case right now, I have a number of predefined partitions and I want to create a disk that is slightly larger than the sum of all the partitions (and I'll let the / partition grow to consume any remaining space). Thus I need to sum over an array of numbers and round up.

Potential configuration

round(sum([1, 2, 3, 4.5]))

Potential References

Terraform already have a sum() function: https://developer.hashicorp.com/terraform/language/functions/sum

On this topic: I find it pretty confusing that Terraform and Packer both use HCL but have different functions available to them. Are there any plans to consolidate the two?