Check if object with same properties is in array - coffeescript

Question

So I'm building a filtering system. I have an array of key-value-pair(kvp) objects and I want to check if a kvp has already been added. If the kvp has I want to remove it, and if it hasn't I want to add it to the array. However I'm having trouble checking deep equality. I can't use an object instead of an array because the keys can be the same (e.g. {state: TX} and {state: NE}). This code doesn't check deep equality so it always pushes a new kvp.

if kvp in filters
    pos = filters.indexOf(kvp)
    filters.splice(pos, 1)
else
    filters.push(kvp)

I tried this as well, but it also didn't check for deep equality (as well as filters exponentially growing).

if filters.length == 0
    filters.push(kvp)
else
    for filter in filters
        if kvp == filter
            pos = filters.indexOf(filter)
            filters.splice(pos, 1)
        else
            filters.push(kvp)

Any suggestions?

The objects are very simple, just one property with one value. — cfatt10, Feb 05 '16 at 18:45
Just compare that property then. See the duplicate question. — Felix Kling, Feb 05 '16 at 18:46
@FelixKling The property itself is could be anything, so is there a simpler way than calling getOwnPropertyNames on the filter, checking if that property is not undefined on the kvp, and then comparing the values? — cfatt10, Feb 05 '16 at 18:54
How about [JavaScript: Get first and only property name of object](http://stackoverflow.com/q/6765864/218196) ? — Felix Kling, Feb 05 '16 at 18:58

Check if object with same properties is in array - coffeescript

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