How to realize the Fast Sum of objects by JavaScript

This article will explain in detail how JavaScript realizes the quick summation of objects. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Quick summation of objects

Sometimes we need to sum a property in an array of objects. In the past, we could use a loop traversal method such as forEach or for to calculate it, but now we can use the reduce method to quickly implement

Const objs = [{name:'lilei', score: 98}, {name:'hanmeimei', score: 95}, {name:'polo', score: 85},...] const scoreTotal = objs.reduce ((total, obj) = > {return obj.score + total;}, 0 / * the second parameter is the initial value of total * /)

Using reduce, you can quickly calculate the sum of an attribute.

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