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Re:WTFJS – a list of funny and tricky JavaScript examples by Sean1708 on Monday July 31, 2017 @09:40AM (#14891832)
What's the reasoning behind this particular example?
Re:WTFJS – a list of funny and tricky JavaScript examples by uwu on Monday July 31, 2017 @09:54AM (#14891953)
i actually got it from https://wtfjs.com/ which was linked in another comment

someone explained how it works here: https://news.ycombinator.com/item?id=14891850