underscore.js - keysDeep mixin

gistfile1.txt

// returns all keys of a given object in any level depth
// ------------------------------------------------------
_.mixin({
	keysDeep: function (obj) {
		var extract = function (obj, result) {
			_.each(_.keys(obj), function(elm) {
				if(_.isString(obj[elm])){
					result.push(elm);
				}
				if(_.isObject(obj[elm])){
					result.push(elm);
					extract(obj[elm], result);
				}
			});
			return result;
		}
		return extract(obj, []);
	}
 });