E singleWhere (bool test(E element), {E orElse()}) inherited
E singleWhere(bool test(E element), {E Function()? orElse}) { int length = this.length; late E match; bool matchFound = false; for (int i = 0; i < length; i++) { E element = this[i]; if (test(element)) { if (matchFound) { throw IterableElementError.tooMany(); } matchFound = true; match = element; } if (length != this.length) { throw ConcurrentModificationError(this); } } if (matchFound) return match; if (orElse != null) return orElse(); throw IterableElementError.noElement(); }