dart:collection

every method

bool every(bool f(E element))

Checks whether every element of this iterable satisfies test.

Checks every element in iteration order, and returns false if any of them make test return false, otherwise returns true.

Source

bool every(bool f(E element)) {
  for (E element in this) {
    if (!f(element)) return false;
  }
  return true;
}