(0, _b.a)()
ensures that the function _b.a
is called with this
set to the global object (or if strict mode is enabled, to undefined
). If you were to call _b.a()
directly, then _b.a
is called with this
set to _b
.
(0, _b.a)();
is equivalent to
0; // Ignore result
var tmp = _b.a;
tmp();
(the ,
is the comma operator, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comma_Operator).