No.

The expression is evaluated before the loop starts in order to build the list of items over which to iterate,
and the expression returns either the result of keys or a single scalar depending on whether conditional's condition is true,
so it either loops for every key or just once.

In reply to Re^3: Loop once on condition 1, many times on cond. 2? by ikegami
in thread Loop once on condition 1, many times on cond. 2? by punch_card_don

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