The ?: operator checks the left-hand side of the expression. If it is not null, the left-hand value is the result of the expression. Otherwise, the right-hand value is the result of the expression. This basically says "use this value, unless it is null, then use this other value".

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Elvis Returns! The Elvis Operator
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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