如果存在键名数组，则更改对象的深层嵌套键值 [英] Change deeply nested key value of an object if there's an array of key names

问题描述

我有一个对象和相同对象键的数组：

I have an object and an array of the same object keys:

var obj = {
 'fieldOne': {
    'fieldTwo': {
        'fieldThree': {
            'fieldFour': {
                'someNestedKey': 'test'
            }
        }
    }
 }
}
var keysArr = ['fieldOne', 'fieldTwo', 'fieldThree', 'fieldFour', 'someNestedKey'];

是否可以使用keys数组更改 someNestedKey值？

Is there a way to change the 'someNestedKey' value using the keys array ?

仅通过索引访问 someNestedKey是行不通的，因为键数组中可能包含或多或少的键。
我尝试以某种方式使用数组长度，但似乎无法正常工作。
我对编程还比较陌生，将不胜感激。

Simply accessing the 'someNestedKey' by indexes won't work, because keys array may have more or less keys in it. I tried somehow using array length, but I can't seem to get it working. I'm relatively new to programming, would much appreciate any help.

推荐答案

您可以走这条路，检查以下元素是否存在。如果未将对象分配给新属性。

You could take the path and make a check if the following element exist. If not assign an object to the new property.

然后返回该属性的值。

在

function setValue(object, path, value) {
    var way = path.slice(),
        last = way.pop();

    way.reduce(function (r, a) {
        return r[a] = r[a] || {};
    }, object)[last] = value;
}

var obj = { fieldOne: { fieldTwo: { fieldThree: { fieldFour: { someNestedKey: 'test' } } } } },
    keysArr = ['fieldOne', 'fieldTwo', 'fieldThree', 'fieldFour', 'someNestedKey'];

setValue(obj, keysArr, 42);
console.log(obj);

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