Recursively prune key from object

gistfile1.js

var recursivePrune = function (obj,keyToRemove) {
	if(typeof obj === "object" && obj instanceof Array) {
		for(x = 0;x < obj.length;x++) {
			obj[x] = this.recursivePrune(obj[x],keyToRemove);
		}
	} else if(typeof obj === "object") {
		delete obj[keyToRemove];
		Object.getOwnPropertyNames(obj).forEach(function(property) {
			obj[property] = recursivePrune(obj[property],keyToRemove);
		});
	}
	return obj;
}