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Answers and rating deltas for

What is "let [a,,b] = [1, 2, 3, 4, 5]" with two commas (,,) doing and how can it be used?

Author Votes Δ
Mitya 4 +0.40
titoih 2 +0.16
Ismael Padilla 1 -3.34
Last visited: May 14, 2020, 3:16:00 AM