setEquals<T> function

bool setEquals <T>(Set<T> a Set<T> b)

Compares two sets for deep equality.

Returns true if the sets are both null, or if they are both non-null, have the same length, and contain the same members. Returns false otherwise. Order is not compared.

The term "deep" above refers to the first level of equality: if the elements are maps, lists, sets, or other collections/composite objects, then the values of those elements are not compared element by element unless their equality operators (Object.operator==) do so.

See also:

  • listEquals, which does something similar for lists.
  • mapEquals, which does something similar for maps.

Implementation

bool setEquals<T>(Set<T> a, Set<T> b) {
  if (a == null)
    return b == null;
  if (b == null || a.length != b.length)
    return false;
  if (identical(a, b))
    return true;
  for (T value in a) {
    if (!b.contains(value))
      return false;
  }
  return true;
}