A selector minangka fungsi sing maca (derived) piece data spesifik saka state. Memoization ngecache asil selector supaya mung recompute nalika inputs berubah — penting kanggo performance nalika selectors ngerjake pekerjaan mahal utawa kanggo nyegah re-renders sing ora perlu.
Basic selectors — encapsulate state access
= state => state.;
= state => state..;
= state =>
state...( sum + i., );
