return false the same as return?

by

No.

var i = (function() { return; })();

i === undefined which means that i == false && i == '' && i == null && i == 0 && !i

var j = (function() { return false; })();

j === false which means that j == false && j == '' && j == null && j == 0 && !j

Weak operators in JS make it seem like the might return the same thing, but they return objects of different types.

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