map 如何在 ReactJs 的 filter() 内抛出 forEach()

Question

Here I have a problem mapping throw forEach() inside the filter(), I'm trying to filter products so for each product object I want to get to the product.categories array , and for each product category I want to check if the product category id === the page category id and then map throw them, and display the product that matches, but nothing gets displayed.

 <div> {products.filter(filterProduct => filterProduct.categories.forEach(eachProductCategory => eachProductCategory.id === category.id)).map(product => ( <Product /> </div>

Answer 1

You could try .some instead of forEach

<div>
  {products
    .filter((filterProduct) =>
      filterProduct.categories.some(
        (eachProductCategory) => eachProductCategory.id === category.id
      )
    )
    .map((product) => (
      <Product />
    ))}
</div>

forEach doesn't return anything that was the problem

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach