unzip

Pair[Array[X], Array[Y]] unzip(Array[Pair[X, Y]])

Creates a Pair of Arrays, the first containing the elements from the left members of an Array of Pairs, and the second containing the right members. If the array is empty, a pair of empty arrays is returned. This is the inverse of the zip function.

Parameters

1. Array[Pair[X, Y]]: The Array of Pairs of length N to unzip.

Returns: A Pair[Array[X], Array[Y]] where each Array is of length N.

Example: test_unzip.wdl

version 1.2

workflow test_unzip {
  Array[Pair[Int, String]] int_str_arr = [(0, "hello"), (42, "goodbye")]
  Map[String, Int] m = {"a": 0, "b": 1, "c": 2}
  Pair[Array[String], Array[Int]] keys_and_values = unzip(as_pairs(m))
  Pair[Array[Int], Array[String]] expected1 = ([0, 42], ["hello", "goodbye"])
  Array[String] expected_keys = ["a", "b", "c"]
  Array[Int] expected_values = [0, 1, 2]
  
  output {
    Boolean is_true1 = unzip(int_str_arr) == expected1
    Boolean is_true2 = keys_and_values.left == expected_keys
    Boolean is_true3 = keys_and_values.right == expected_values
  }
}

{}

{
  "test_unzip.is_true1": true,
  "test_unzip.is_true2": true,
  "test_unzip.is_true3": true
}