如何使用javascript根据索引比较两个数组和不匹配？

Question

var a=["a","b","c","d"];
var b=["b","a","c","d"];

我需要这样的输出：

来自 a 的不匹配数组

不匹配数组=["a", "b"];

Answer 1

要比较两个数组并根据索引识别不匹配项，您可以使用 for 循环遍历每个数组中的元素。在每次迭代中，您可以检查当前索引处的元素是否不相等，如果不相等，则可以将它们添加到新数组中。这是一个例子：

var a = ["a", "b", "c", "d"];
var b = ["b", "a", "c", "d"];

// Create an empty array to hold the mismatched elements
var mismatch = [];

// Loop through the elements in the arrays
for (var i = 0; i < a.length; i++) {
  // Check if the elements at the current index are not equal
  if (a[i] !== b[i]) {
    // If they're not equal, add them to the mismatch array
    mismatch.push(a[i]);
    mismatch.push(b[i]);
  }
}

// Output the mismatch array
console.log("Mismatch array:", mismatch);

Answer 2

您可以使用过滤函数并使用数组中的索引检查值，然后您可以从 a 中获取不匹配的值。

var a = ["a", "b", "c", "d"];
var b = ["b", "a", "c", "d"];

var c = a.filter(function (item, index) {
  return item !== b[index];
});

console.log(c);

Answer 3

这里我使用了 Javascript 的 filter 方法来获取不匹配的 Array。

const a = ["a","b","c","d"];
const b = ["b","a","c","d"];

const mismatchedArr = a.filter((aItem,index) => aItem !== b[index]);
console.log(mismatchedArr); //Prints ["a","b"]