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https://www.snopes.com/fact-check/titanic-first-sos/

This is what minified JavaScript can look like, which is what most of the web runs on! JavaScript allows global variables to be declared without using var, const, or let keywords. Whitespace is also optional in all of the circumstances used in this answer. This answer is clever because it takes advantage of the above, which optimizes for bytes used, but would not be considered best practice for any team unless the goal was to create the smallest possible function. Codegolf is a common reason for doing this and can help you learn about some interesting JavaScript quirks.

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TLDR: Using bitwise XOR on the same variable twice with the same integer will result in the original value. Ex: A ^ B ^ B = A.