operator []= method
Set variable value
Implementation
operator []=(String variableName, double variableValue) {
if (_pExpression == 0) throw ClearedExpressionException();
final pVariableName = _variableNames[variableName];
if (pVariableName != null) {
FlutterExprtkPlatform.instance
.setVar(pVariableName, variableValue, _pExpression);
} else {
throw UninitializedVariableException();
}
}