sep

String sep(String, Array[P])

Concatenates the elements of an array together into a string with the given separator between consecutive elements. There are always N-1 separators in the output string, where N is the length of the input array. A separator is never added after the last element. Returns an empty string if the array is empty.

Parameters

1. String: Separator string.
2. Array[P]: Array of strings to concatenate.

Returns: A String with the concatenated elements of the array delimited by the separator string.

Example: test_sep.wdl

version 1.2

workflow test_sep {
  Array[String] a = ["file_1", "file_2"]

  output {
    # these all evaluate to true
    Array[Boolean] all_true = [
      sep(' ', prefix('-i ', a)) == "-i file_1 -i file_2",
      sep("", ["a", "b", "c"]) == "abc",
      sep(' ', ["a", "b", "c"]) == "a b c",
      sep(',', [1]) == "1"
    ]
  }
}

{}

{
  "test_sep.all_true": [true, true, true, true]
}