Returns a new IndexedSeq[T] with the new value appended to the end.
Returns a new IndexedSeq[T] with the value inserted at the specified index.
Returns true if the specified index is out of bounds.
Returns true if the specified index is out of bounds, assuming zero based.
Returns a new IndexedSeq[T] with the value at the specified index removed.
Returns a new IndexedSeq[T] with the value replaced at the specified index.