typeof is an operator that is used to identify the type of any object in javascript. It returns a value that is string. So you can compare any string value from returned value of typeof. // Examples ...

// This stands since the beginning of JavaScript typeof null === 'object'; A fix was proposed for ECMAScript (via an opt-in), but was rejected. It would have resulted in typeof null === 'null'.

An extended Javascript object type getter. JSMicro TypeOf will allow us to register our own object type. Permission is hereby granted, free of charge, to any person obtaining a copy of this software ...