average method

num average([
  1. num selector(
    1. E
    )?
])

返回平均值。

Example:

[1, 2, 3].average();               // 2.0

Implementation

num average([num Function(E)? selector]) {
  if (isEmpty) return 0;
  final newSelector = selector ?? (e) => e;
  return average(newSelector);
}