Associates the key with the given value.
If the key was already in the map, its associated value is changed. Otherwise the key/value pair is added to the map.
void operator []=(String key, String value) {
_setItem(key, value);
}
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-html/Storage/operator_put.html