I think it doesn't like the double assignment on same expression. In JS you can do:
[a, b] = [b, a];
or
b = [a, a = b][0];
although less readable.
[] allocates new space I think so this solution won't be in constant space.
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I think it doesn't like the double assignment on same expression. In JS you can do:
or
although less readable.
[] allocates new space I think so this solution won't be in constant space.