void addAll(
Map<K,V> other
)

Adds all key-value pairs of other to this map.

If a key of other is already in this map, its value is overwritten.

The operation is equivalent to doing this[key] = value for each key and associated value in other. It iterates over other, which must therefore not change during the iteration.

Source

/**
 * Adds all key-value pairs of [other] to this map.
 *
 * If a key of [other] is already in this map, its value is overwritten.
 *
 * The operation is equivalent to doing `this[key] = value` for each key
 * and associated value in other. It iterates over [other], which must
 * therefore not change during the iteration.
 */
void addAll(Map<K, V> other);