Shulou(Shulou.com)06/01 Report--

Xiaobian to share with you how ES5 to achieve the array reduce method, I hope you have something to gain after reading this article, let's discuss it together!

ES5 implements the reduce method of arrays

Because sparse array relationships may exist, the reduce implementation is a bit more complicated, making sure to skip sparse elements and traverse the correct elements and subscripts.

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