The new Uize.isFunction static method of the Uize base class returns a boolean, indicating whether or not the specified value is a function.

The Uize.isFunction method provides a useful abstraction to deal with some issues with detecting function type values using the traditional typeof value == 'function' approach in different Web browsers. For example, in a number of browsers, instances of JavaScript's built-in RegExp object are reported as type 'function' by the typeof operator. Also, in Microsoft Internet Explorer, references to functions defined in another window are not reported as type 'function' by the typeof operator, and such function references will also fail in a test of "instanceof Function". The Uize.isFunction method deals with these issues, providing a more reliable way to test for function type values. A number of modules, that were using the traditional typeof value == 'function' approach to testing for function type values, were updated to use the new Uize.isFunction method. The new method is fully documented.