lang: "range" function

[apparentlymart]

This is similar to the function of the same name in Python, generating a sequence of numbers as a list that can then be used in other sequence-oriented operations.

The primary use-case for it is to turn a count expressed as a number into a list of that length, which can then be iterated over or passed to a collection function to produce that number of something else, as shown in the example at the end of its documentation page, which is also duplicated here for easier reference:

variable "name_counts" {
  type    = map(number)
  default = {
    "foo" = 2
    "bar" = 4
  }
}

locals {
  expanded_names = {
    for name, count in var.name_counts : name => [
      for i in range(count) : format("%s%02d", name, i)
    ]
  }
}

output "expanded_names" {
  value = local.expanded_names
}

# Produces the following expanded_names value when run with the default
# "name_counts":
#
# {
#   "bar" = [
#     "bar00",
#     "bar01",
#     "bar02",
#     "bar03",
#   ]
#   "foo" = [
#     "foo00",
#     "foo01",
#   ]
# }

This has been hanging out in cty for a while and so was already vendored, but I was holding for 0.12.0 to be complete to avoid adding additional scope.

[apparentlymart]

I'm going to hold this for now so we can focus 0.12.1 only on fixing bugs.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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