javascript - 如何使用外部值检查数组的索引以生成新数组？

Question

我有一个数组和 2 个变量。这两个变量都是数字，数组包含 12 个值。

const firstParam = 6;
const secondParam = 0;

originalArray = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

我想获取数字并检查第二个数组的索引是否匹配，然后更改匹配的值。

在这种情况下，输出将是

newArray = ["blank", "February", "March", "April", "May", "June", "blank", "August", "September", "October", "November", "December"];

我尝试使用 map ，但它没有应用

    const newArray = originalArray.map((element, index) => firstParam ? null : element);

我该怎么做？ 有没有更好的方法来获得想要的结果？

感谢您的帮助

Answer 1

您可以采用一个数组作为索引，并使用 Array#includes 检查索引。并返回旧值的新值。

const
    indices = [6, 0],
    originalArray = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
    result = originalArray.map((v, i) => indices.includes(i) ? 'blank' : v);

console.log(...result);