each<T> function
Builds one child for each item in values.
The result is an iterable so it can be spread directly into a children
collection. Null results are handled by normalizeChildren.
Implementation
Iterable<ReactNode> each<T>(
Iterable<T> values,
ReactNode Function(T value, int index) builder,
) sync* {
var index = 0;
for (final value in values) {
yield builder(value, index++);
}
}