JS filter() 函数 - 有没有办法阻止过滤器达到 0 结果？

问题描述

我有以下代码，它循环遍历一个数组，在归因于每个对象的关键字中查找一个术语。

代码来自 Wix 的本教程（第 7 步）https://support.wix.com/en/article/velo-tutorial-adding-a-gift-quiz-to-a-wix-stores-site

我需要一些逻辑来防止最终返回 0 结果/空数组，但无法理解循环。理想情况下，当它仍然找到结果时，它会是前一个循环的结果。

// Filter out products that don't match the specified answer.
function filterProductsPerAnswer(quizProducts,answer) {
    // Use the JavaScript filter() function to filter out products that don't match the specified answer.
    const filteredProducts = quizProducts.filter(quizProduct => {
        return quizProduct.keywords.includes(answer)
    });
    // Return the filtered product list.
    return filteredProducts;

}

这让我很生气，所以非常感谢任何帮助！

解决方法

就像@Taplar 在评论中指出的那样，解决方案可能是您的另一个功能：

    function filteredProductsOrAllProductsIfNoMatch(quizProducts answer) {
        const filteredProducts = filterProductsPerAnswer(quizProducts,answer);
        if (filteredProducts.length === 0) {
            return quizProducts;
        }
        return filteredProducts;
    }
    
    // Your original code:
    // Filter out products that don't match the specified answer.
    function filterProductsPerAnswer(quizProducts,answer) {
        // Use the JavaScript filter() function to filter out products that don't match the specified answer.
        const filteredProducts = quizProducts.filter(quizProduct => {
            return quizProduct.keywords.includes(answer)
        });
        // Return the filtered product list.
        return filteredProducts;
    }