as_map

Map[P, Y] as_map(Array[Pair[P, Y]])

Converts an Array of Pairs into a Map in which the left elements of the Pairs are the keys and the right elements the values. All the keys must be unique, or an error is raised. The order of the key/value pairs in the output Map is the same as the order of the Pairs in the Array.

Parameters

1. Array[Pair[P, Y]]: Array of Pairs to convert to a Map.

Returns: Map[P, Y] of the elements in the input array.

Example: test_as_map.wdl

version 1.2

workflow test_as_map {
  input {
    Array[Pair[String, Int]] x = [("a", 1), ("c", 3), ("b", 2)]
    Array[Pair[String, Pair[File,File]]] y = [("a", ("data/cities.txt", "data/comment.txt")), ("b", ("data/hello.txt", "data/greetings.txt"))]
    Map[String, Int] expected1 = {"a": 1, "c": 3, "b": 2}
    Map[String, Pair[File, File]] expected2 = {"a": ("data/cities.txt", "data/comment.txt"), "b": ("data/hello.txt", "data/greetings.txt")}
  }

  output {
    Boolean is_true1 = as_map(x) == expected1
    Boolean is_true2 = as_map(y) == expected2
  }
}

{}

{
  "test_as_map.is_true1": true,
  "test_as_map.is_true2": true
}

Example: test_as_map_fail.wdl

version 1.2

workflow test_as_map_fail {
  # this fails with an error - the "a" key is duplicated
  Boolean bad = as_map([("a", 1), ("a", 2)])
}

{}

{}

{
  "fail": true
}