LeetCode 415. Add Strings |JSer - JavaScript & Algorithm

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An easy one but not easy to write a bug-free one in one try. need to be careful about the boundary and carry problem
Hi I'm a JavaScript engineer who is not good at algorithms,
and currently practicing leetCode online. If you are interested, maybe we can learn together.
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It would also be helpful if you explained result[length - 1 -i] = sum, why do we need - i wont sum always be the last element?

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