What is the difference between primaryColor and primarySwatch in Flutter?

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primarySwatch is not a Color. It’s MaterialColor.
Which means it’s different shades of a color a material app will use.

primaryColor is one of those shades. To be exact, primaryColor is normally equal to primarySwatch[500].

It is usually better to define a primarySwatch instead of primaryColor. Because some material components may use a different shade of the primaryColor for things such as shadow, border, …

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