That = in += is redundant since the reducer only needs to return the new value, not change the old one. I mean, it'll still work, because the correct value is returned, but there's no need in changing the passed-in accumulator.
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That
=in+=is redundant since the reducer only needs to return the new value, not change the old one. I mean, it'll still work, because the correct value is returned, but there's no need in changing the passed-in accumulator.