sumBy<T> function

num sumBy<T>(
  1. Iterable<T> iterable,
  2. num accessor(
    1. T
    )
)

Returns the sum using an accessor function.

Implementation

num sumBy<T>(Iterable<T> iterable, num Function(T) accessor) {
  num total = 0;
  for (final item in iterable) {
    total += accessor(item);
  }
  return total;
}