By default, null is not a valid value for properties, variables, and parameters.

To allow null, you add a ? to the type of the property, variable, parameter, or return type. So, String becomes String?, Int becomes Int?, and so on.

You can learn more about this in:
Tags:
Elvis Returns! Functions on Nullable Types Nullable Casts Nullable Casts, Continued Nullable Generic Types Nullable Generic Types, Continued Nullable Types Safe Call Chains Safe Calls Smart Contracts The Elvis Operator
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