RosettaCodeData/Task/Empty-string/Diego/empty-string-2.diego

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add_str(es,⟦⟧);
add_bool(isEmpty)
()_check⟦[es]==⟦⟧⟧;
()_if⟦[es]≍⟦⟧⟧;
()_calc({bool},⟦[es]==⟦⟧⟧);
()_test⟦[lens]≍0⟧_lento(lens,⟦[es]⟧);
()_is⟦[lens]>0⟧_lento(lens,⟦[es]⟧);
()_check⟦[es]===({str},⟦⟧)⟧;
()_if⟦[es]≡({str},⟦⟧)⟧;
()_calc⟦≣[es]⟧_forme()_forall();
()_not⟦[es]≠⟦⟧⟧;
()_not()_bool[es];
()_empty[es];
(es)_equal⟦⟦⟧⟧;
;
log_console()_(isEmpty);
log_console()_is(es); // is not null