save and reuse computed data in widget build: flutter - Flutter Flux

The question is how to prevent calls that compute data in build.

Example (a simplistic one)

for (var map in something)
...
child: Row(
  children: [
    Text(getActualDate(map['days'])),
    Text(getActualDate(map['days']))
  ],
),
...

Here the getActualDate function has been called and the result available. How can I save and reuse that result and not call getActualDate again?

Solution 1: BJW

By using state management, like provider

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