Updates all values.
Iterates over all entries in the map and updates them with the result of invoking update
.
void updateAll(V update(K key, V value)) { for (var key in this.keys) { this[key] = update(key, this[key]); } }
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https://api.dartlang.org/stable/2.0.0/dart-collection/MapMixin/updateAll.html