使用JavaScript中的给定字符串值获取多维数组的索引 [英] Get the index of a multidimensional array with the value of a given string in javascript

问题描述

我有这个数组，

var arr = [["present",["John","Josh","Jay"]],["absent",["May","Mary","Mary Jane"]]];

var arr2 = [["J",["John","Josh","Jay"]],["M",["May","Mary","Mary Jane"]]];

我想获取 data [0] Mary 的数组的c>。
因此，在我的示例中，我将获得的值是不存在 。

And I want to get the data[0] of the array that have value of "Mary". So in my example, value that I will get is "absent".

我还希望获得值为 Josh 的数组arr2的索引。
因此，在第二个数组中，我得到的值为0。

I want also to get the index of the array arr2 that have value of "Josh". So in my second array, value that I will get is 0.

如果可以使用下划线js，我们可以使用它。
我尝试使用 _。contains（），但失败了。
这些数组也用于淘汰赛js。

If possible to use underscore js, we can use it. I tried to use _.contains() but failed. Also these array is used in knockout js.

推荐答案

另一种完成此工作的方法如下：

One other way of doing this job could be as follows;

var    a1 = [["present",["John","Josh","Jay"]],["absent",["May","Mary","Mary Jane"]]],
       a2 = [["J",["John","Josh","Jay"]],["M",["May","Mary","Mary Jane"]],["S",["Sally","Sam","Sammy Davis"]]],
getStatus = (a,n) => a.find(e => e[1].indexOf(n) !== -1)[0],
 getIndex = (a,n) => a.findIndex(e => e[1].indexOf(n) !== -1);

console.log(getStatus(a1,"Mary"));
console.log(getIndex(a2,"Sammy Davis"));

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