Question

我在这里看到一些非常奇怪的东西，我无法弄清楚。我试图返回一个逗号分隔的字符串，其中包含strArr元素中出现的数字。

您将在传递给FindIntersection的自变量["1, 2, 4, 5, 6, 9", "2, 3, 4, 8, 10"]中看到2出现在两个数组中，但在filter {{1中找不到}}测试。谁能解释一下？

includes

Answer 1

数组1中的每个元素都有一个前导空格，因此您需要在比较它们之前对它们进行修整。

const FindIntersection = (strArr) => {

  const strArrOne = strArr[0].split(',').map(x => x.trim())
  const strArrTwo = strArr[1].split(',').map(x => x.trim())
  const intersection = strArrOne.filter(item => {
    return strArrTwo.includes(item)
  }).join(',').replace(/\s/g, '');
  console.log(intersection)
  return intersection;
}
   
console.log(FindIntersection(["1, 2, 4, 5, 6, 9", "2, 3, 4, 8, 10"]));

Answer 2

第一个数组元素中2之前有一个多余的空格，您需要删除其中包含===用来检查是否存在的空格

const FindIntersection = (strArr) => {

  const strArrOne = strArr[0].split(',').map(s=> s.replace(/\s/g,''))
  const strArrTwo = strArr[1].split(',').map(s=> s.replace(/\s/g,''))
  const intersection = strArrOne.filter(item => {
    console.log('2',strArrTwo)
    console.log('item --> ', item)
    console.log('includes ---> ', strArrTwo.includes(item))
    return strArrTwo.includes(item)
  }).join(',').replace(/\s/g, '');
  console.log(intersection)
  return intersection;
}
   
console.log(FindIntersection(["1, 2, 4, 5, 6, 9", "2, 3, 4, 8, 10"]));

Answer 3

删除空格是最简单的解决方法

const FindIntersection = (strArr) => {

  const strArrOne = strArr[0].split(',')
  const strArrTwo = strArr[1].split(',')
  const intersection = strArrOne.filter(item => {
    console.log('2',strArrTwo)
    console.log('item --> ', item)
    console.log('includes ---> ', strArrTwo.includes(item))
    return strArrTwo.includes(item)
  }).join(',').replace(/\s/g, '');
  console.log(intersection)
  return intersection;
}
   
console.log(FindIntersection(["1,2,4,5,6,9", "2,3,4,8,10"]));

Answer 4

由于期望数组中的第一个项目，其他项目在数字之前有空格。要解决此问题，您可以映射所有项目以将项目转换为如下所示的数字：

const FindIntersection = strArr => {
    const strArrOne = strArr[0].split(",").map(item => Number(item));
	const strArrTwo = strArr[1].split(",").map(item => Number(item));
    const intersection = strArrOne
        .filter(item => {
            console.log("2", strArrTwo);
            console.log("item --> ", item);
            console.log("includes ---> ", strArrTwo.includes(item));
            return strArrTwo.includes(item);
        })
        .join(",")
        .replace(/\s/g, "");
    console.log(intersection);
    return intersection;
};

console.log(FindIntersection(["1, 2, 4, 5, 6, 9", "2, 3, 4, 8, 10"]));

过滤器并包括给出意外结果

4 个答案: