数组中出现的次数

Question

是否可以在数组中包含每个值的出现次数？

例如：

items = ["pineapple", "apples", "tomatoes", "water", "apples","tomatoes"];

我想要显示：

  菠萝出现1次，苹果出现2次等。

Answer 1

您可以尝试以下代码

const items = ["pineapple", "apples", "tomatoes", "water", "apples","tomatoes"];
items.reduce((counts, curr) => (counts[curr] = ++counts[curr] || 1, counts), {});