update method
inherited
This operation is not supported by an unmodifiable map.
Implementation
V update(K key, V update(V value), {V ifAbsent()}) {
throw new UnsupportedError("Cannot modify unmodifiable map");
}
This operation is not supported by an unmodifiable map.
V update(K key, V update(V value), {V ifAbsent()}) {
throw new UnsupportedError("Cannot modify unmodifiable map");
}