The following keywords are part of the JavaScript language, and have special meaning to the JavaScript interpreter. Therefore, they may not be used as identifiers:

break     do        if         switch  typeof 







case      else      in         this    var 







catch     false     instanceof throw   void 







continue  finally   new        true    while 







default   for       null       try     with







delete    function  return

JavaScript also reserves the following words for possible future extensions. You may not use any of these words as identifiers either:

abstract  enum        int        short



boolean   export      interface  static



byte      extends     long       super



char      final       native     synchronized



class     float       package    throws



const     goto        private    transient



debugger  implements  protected  volatile



double    import      public

In addition, you should avoid creating variables that have the same name as global properties and methods: see the Global, Object, and Window reference pages. Within functions, do not use the identifier arguments as an argument name or local variable name.

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