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contains(list, value) returns true if value is present in list, and false otherwise.

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Signature

contains(list list, value any) bool

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Example

Only run the container build task when the current operating system is one of the supported platforms: 
computed "current_os" {
  expression = os()
}

task "build-image" {
  description = "Build the Docker image"
  condition   = contains(["linux", "darwin"], computed.current_os)
  commands    = ["docker build -t myapp:latest ."]
}
On Windows, where the Docker build task requires different setup, the task is skipped automatically.

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Notes

  • The comparison is type-sensitive. A string "1" and a number 1 are not equal.
  • contains works on lists, tuples, and sets, not maps. To check map keys, use lookup with a sentinel value.