KEYWORDS AND RESERVED WORDS

ECMA-262 describes a set of reserved keywords that have specific uses, such as indicating the beginning or end of control statements or performing specific operations. By rule, keywords are reserved and cannot be used as identifiers or property names. The complete list of keywords for ECMA-262, sixth edition is as follows:

break     do        in         typeof
case      else      instanceof var
catch     export    new        void
class     extends   return     while
const     finally   super      with
continue  for       switch     yield
debugger  function  this
default   if        throw
delete    import    try

The specification also describes a set of future reserved words that cannot be used as identifiers or property names. Though reserved words don't have any specific usage in the language, they are reserved for future use as keywords.

The following is the complete list of future reserved words defined in ECMA-262, sixth edition:

Always reserved...