average method

num? average([ num value(E)? ])

Returns the average of all the values in this iterable.

If value is provided, it will be used to compute the value to be averaged.

Returns null if this is empty.

Example:

[2, 2, 4, 8].average(); // 4.
[2, 2, 4, 8].average((i) => i + 1); // 5.
[].average() // null.

Implementation

num? average([num Function(E)? value]) {
  if (this.isEmpty) return null;

  return this.sum(value) / this.length;
}