a1 property

A1? get a1

If this partial has letters and digitis it get be returned as A1 otherwise a null is returned

Examples:

A1? a1 = A1Partial('A', 1); // A1
a1 = A1Partial('A', null); // null
a1 = A1Partial(null, 1); // null

Implementation

A1? get a1 =>
    letters != null && digits != null ? A1.fromVector(column!, row!) : null;