operator []= method
override
Sets the value at the given index in the list to value.
The index must be a valid index of this list, which means that index must be non-negative and less than length.
Implementation
void operator []=(int index, String value) {
throw new UnsupportedError("Cannot assign element of immutable List.");
}
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https://api.dart.dev/stable/2.13.0/dart-svg/StringList/operator_put.html