I found this in sources of Material UI
(0, _classCallCheck3.default)(this, Drawer);
For instance
var c = function (a, b) {console.log(a, b)};
(5, c)(1, 2); // prints '1 2', but what is 5 doing?
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Boris Shevchenko
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Please format your code properly next time. – Carcigenicate Feb 01 '17 at 17:51
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And this looks like the comma operator is just throwing away the first argument, making it evaluate to the second. – Carcigenicate Feb 01 '17 at 17:52
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The 5 does nothing at all. The expression evaluates to the rightmost item if separated by commas and is the same as writing `5; c(1,2);` – Blindman67 Feb 01 '17 at 18:06