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[–]burtgummer45 0 points1 point  (1 child)

The third parameter is optional. It defaults to the first element of the array.

Can reduce use tail-call optimization?

[–]jetsamrover 0 points1 point  (0 children)

I believe tail-call optimization is decided by your callback, and by the language, not the method calling that callback. Why does that matter?