mapEquals<T, U> function
Compares two maps for deep equality.
Returns true if the maps are both null, or if they are both non-null, have the same length, and contain the same keys associated with the same values. Returns false otherwise.
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:
- setEquals, which does something similar for sets.
- listEquals, which does something similar for lists.
Implementation
bool mapEquals<T, U>(Map<T, U> a, Map<T, U> b) {
if (a == null)
return b == null;
if (b == null || a.length != b.length)
return false;
if (identical(a, b))
return true;
for (final T key in a.keys) {
if (!b.containsKey(key) || b[key] != a[key]) {
return false;
}
}
return true;
}