js: recursive pluck for javascript objects

objectpluck.js

function opop(obj,k) {
	for(o in obj) {
		if(o == k) {
			result = obj[o];
			delete obj[o];
			return result;
		}
		else if(typeof obj[o] == 'object' && obj[o].constructor == Object) {
			if(a = opop(obj[o], k)) return a;
		}
	}
}