safeUpdate method

void safeUpdate(
  1. K key,
  2. V value
)

Updates only if the key already exists. Else, do nothing.

Example:

final map = {'a': 1, 'b': 2, 'c': 3};
map.safeUpdate('b', 4);
print(map); // Output: {'a': 1, 'b': 4, 'c': 3}

Implementation

void safeUpdate(K key, V value) {
  if (containsKey(key)) {
    this[key] = value;
  }
}