在深层对象中按名称查找属性 [英] Find property by name in a deep object

问题描述

我有一个巨大的收藏品，我正在寻找集合中某个地方的钥匙。获取包含该键/索引的所有对象的引用列表或完整路径的可靠方法是什么？我使用jQuery和lodash，如果它有帮助，你可以忘记无限指针递归，这是一个纯粹的JSON响应。

I have a HUGE collection and I am looking for a property by key someplace inside the collection. What is a reliable way to get a list of references or full paths to all objects containing that key/index? I use jQuery and lodash if it helps and you can forget about infinite pointer recursion, this is a pure JSON response.

fn({ 'a': 1, 'b': 2, 'c': {'d':{'e':7}}}, "d"); 
// [o.c]

fn({ 'a': 1, 'b': 2, 'c': {'d':{'e':7}}}, "e");
// [o.c.d]

fn({ 'aa': 1, 'bb': 2, 'cc': {'d':{'x':9}}, dd:{'d':{'y':9}}}, 'd');
// [o.cc,o.cc.dd]

fwiw lodash有一个_.find函数将找到两个嵌套深度的嵌套对象，但之后似乎失败了。 （例如 http://codepen.io/anon/pen/bnqyh ）

fwiw lodash has a _.find function that will find nested objects that are two nests deep, but it seems to fail after that. (e.g. http://codepen.io/anon/pen/bnqyh)

推荐答案

这应该这样做：

function fn(obj, key) {
    if (_.has(obj, key)) // or just (key in obj)
        return [obj];
    // elegant:
    return _.flatten(_.map(obj, function(v) {
        return typeof v == "object" ? fn(v, key) : [];
    }), true);

    // or efficient:
    var res = [];
    _.forEach(obj, function(v) {
        if (typeof v == "object" && (v = fn(v, key)).length)
            res.push.apply(res, v);
    });
    return res;
}

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