ABAP: Map Table with FOR IN Loop

Since ABAP 740 you can use the FOR IN Operator.

lt_keys_out = VALUE #( FOR ls_key IN lt_keys_in ( VALUE #( key = ls_key-artikel_key ) ) ).
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In this example we want to map the table lt_keys_in to the table lt_keys_out and more specifically the attribute artikel_key onto key. The FOR Operator in Combination with the VALUE Operator let's us do that easily in one line.