Clone method from JFP 2.4.0

j.clone.source.js

function clone (originalValue, depth) {
        var depthOkay = j.isUndefined(depth) || j.geq(depth, 0),
            copyOkay = j.isType('object', originalValue) || j.isType('array', originalValue);
        
        function copy () {
            var keys = Object.keys(originalValue),
                container = j.isArray(originalValue) ? [] : {};
            
            j.each(function (key) {
                var newDepth = j.isNumber(depth) ? depth - 1 : undefined;
                
                try {
                    container[key] = clone(originalValue[key], newDepth);
                } catch (err) {
                    throw new RangeError('Object contains circular reference or is too deep to clone.');
                }
                
            }, keys);
            
            return container;
        }
        
        return copyOkay && depthOkay ? copy() : originalValue;
    }