从数组中过滤数据并将其分组到javascript中？

Question

我有一个如下所示的数组

OStatus=["hold","approved","rejected","hold","approved","rejected","hold","approved"]

我在结果中想要这样的东西

Oinfo=["hold":3,"approved":3,"rejected":2].

Answer 1

假设您想生成一个对象，该对象将来自输入数组的元素的键映射到每个元素的计数值，您可以使用Array.reduce，如下所示：

import { Cell } from './modules/Cell';