jQuery Class Manipulation

Requirements

• Export $(element) as named and default. Accept a single Element and return a wrapper exposing element, addClass, removeClass, toggleClass, and hasClass.
• addClass(string), removeClass(string), and toggleClass(string, force?) accept whitespace-separated tokens. Ignore empty tokens and process duplicate tokens once per call.
• addClass adds missing tokens; removeClass removes listed tokens. removeClass() with no argument clears every class. Empty strings otherwise have no effect.
• Without force, toggleClass flips each token. With force true, add each token; with force false, remove each token.
• The three mutation methods return the same wrapper for chaining. hasClass(validSingleToken) returns a boolean and matches complete case-sensitive tokens.
• Preserve unrelated classes and attributes. Operate on the element’s current classList, so external changes remain visible. Multiple elements, selectors, callbacks as class values, and invalid hasClass tokens are outside scope.

Examples

Input: $(element).addClass("active selected").removeClass("selected").toggleClass("ready", true);
Output: The element has active and ready classes.

Input: $(element).hasClass("active");
Output: true when active is a complete class token.