sumByValue method

double sumByValue(
  1. num selector(
    1. T
    )
)

Calculates the sum of a list of objects based on a specific property value.

The selector function retrieves the property value to be summed for each element. The property value can be either a string or a number.

Returns the sum as a string representation.

Example:

List<MyObject> myList = [
  MyObject(5),
  MyObject(10),
  MyObject(3),
];

int sum = myList.sumByValue((obj) => obj.value);
print(sum); // Output: 18

Implementation

double sumByValue(num Function(T) selector) {
  double total = 0;

  for (T e in this) {
    num value = selector(e);
    total += value;
  }

  return total;
}