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distinct(list) returns a new list with duplicate values removed. The first occurrence of each value is kept.

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Signature

distinct(list list) list

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Example

Combine package lists from multiple variables and ensure no package appears twice before passing the list to a build command: 
variable "base_packages" {
  type    = list(string)
  default = ["./cmd/api", "./cmd/worker"]
}

variable "extra_packages" {
  type    = list(string)
  default = ["./cmd/worker", "./cmd/scheduler"]
}

computed "packages" {
  description = "Deduplicated list of packages to build"
  expression  = distinct(concat(var.base_packages, var.extra_packages))
}

task "build" {
  description = "Build all unique packages"
  commands    = ["go build ${join(" ", computed.packages)}"]
}
["./cmd/api", "./cmd/worker", "./cmd/scheduler"] is the result, with the duplicate ./cmd/worker removed.

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Notes

  • Order is preserved based on first occurrence.
  • distinct works on lists of any comparable element type.