根据另一个数组的索引获取一个数组的值

Get the value of one array according to another arrays index

本文关键字：数组 一个 获取 另一个 索引      更新时间：2023-09-26

我试图通过使用array2的索引来获得array1内的数值值。例如，我的数组是这样的:

const array1 = ["3","4","5","6","7","8"];
const array2 = ["bat","cat","dog","fish","cow","bird"];

如果用户选择"cat"，它应该抓取"4"。

array2.forEach(animal => {
   console.log(array1.indexOf(animal)); // returns -1 
});

我怎样才能使它工作?

将array2的当前索引传递给forEach回调(第二个参数)

const array1 = ["3","4","5","6","7","8"];
const array2 = ["bat","cat","dog","fish","cow","bird"];
array2.forEach((animal, i) => {
   console.log(array1[i]);
});

只需使用括号符号和indexOf 

const array1 = ["3","4","5","6","7","8"];
const array2 = ["bat","cat","dog","fish","cow","bird"];
let choice = 'cat'; // user selection
let result = array1[array2.indexOf(choice)]; // grab value
alert(result);

你的代码需要修改。

据我所知有两个条件。第一种方法是获取动物名称并在array1中搜索相关索引。第二种方法是在array2上循环，然后在array1中得到相关的项。

//First condition
var animalName = 'XXX'; // You get this from the user.
var indexOfAnimal = array2.indexOf(animalName); 
var relatedItem = array1[indexOfAnimal];
//Second condition
foreach(var index in array2){
    console.log(array1[index]);
}
//Your code with changes
array2.forEach(animal => {
    var indexOfAnimal = array2.indexOf(animal);
    console.log(array1[indexOfAnimal]);
});
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