jquery.inArray（）与Object.hasOwnProperty（）之间的性能差异？ [英] Performance differences between jquery.inArray() vs Object.hasOwnProperty()?

问题描述

我有一种情况，我可以选择将字符串键的集合作为对象来实现：

I have a situation where I can choose to implement a collection of string keys as an object:

$.each(objects, function (key, object) {
    collection[key] = "doesn't matter";
});

或数组：

$.each(objects, function (key, object) {
    collection.push(key);
});

我希望能够快速确定集合是否包含给定密钥。如果collection是一个对象，我可以使用：

I'd like to be able to quickly determine whether or not the collection contains a given key. If collection is an object, I can use:

if (collection.hasOwnProperty(key_to_find)) { // found it!... }
else { // didn't find it... }

如果collection是一个数组，我可以使用：

If collection is an array, I can use:

if ($.inArray(key_to_find, collection)) { // found it!... }
else { // didn't find it... }

我想像使用JavaScript的内置hasOwnProperty会比jQuery的inArray（）更快，但我不完全确定。有没有人更多地了解这两种方法之间的性能差异？或者，这里有一个我不知道的更有效的替代方案吗？

I'd imagine using JavaScript's built-in hasOwnProperty would be faster than jQuery's inArray(), but I'm not entirely sure. Does anyone know more about the performance differences between these two methods? Or, is there a more efficient alternative here that I am not aware of?

推荐答案

如果我们谈的是它有多长需要检查，然后真的没有比赛：

If we're talking just how long it takes to check, then there's really no contest:

http://jsperf.com/array-vs-obj

由于其他人所说的原因，hasOwnProperty的速度更快。

hasOwnProperty is way way faster for the reasons stated by others.

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