sumBy<T extends num> method
T
sumBy<T extends num>(
- T selector(
- E element
Returns the sum of all values produced by selector
function applied to
each element in the collection.
Implementation
T sumBy<T extends num>(T Function(E element) selector) {
var sum = T == double ? 0.0 : 0;
for (final current in this) {
sum += selector(current);
}
return sum as T;
}