any method

bool any (bool test(E element))

Checks whether any element of this iterable satisfies test.

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

Implementation 

bool any(bool test(E element)) {
  int length = this.length;
  for (int i = 0; i < length; i++) {
    if (test(this[i])) return true;
    if (length != this.length) {
      throw new ConcurrentModificationError(this);
    }
  }
  return false;
}