In Dart, spread operations allow you to easily combine or create collections by spreading the elements of another collection. There are two types of spread operations: spread (...) and null-aware spread (...?).
Spread ( . . .) Operations
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Maps:
Null-aware Spread (...?) Operation
The null-aware spread operator (...?) is used to spread elements only if the source collection is not null.
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Maps:
Spread operations are useful for creating new collections, combining existing ones, and handling cases where collections might be null. They provide a concise and readable way to manipulate collections in Dart.