(octave.info)Keywords

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F.1 Keywords
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The following identifiers are keywords, and may not be used as variable
or function names:

‘__FILE__’               ‘__LINE__’               ‘break’
‘case’                   ‘catch’                  ‘classdef’
‘continue’               ‘do’                     ‘else’
‘elseif’                 ‘end’                    ‘end_try_catch’
‘end_unwind_protect’     ‘endclassdef’            ‘endenumeration’
‘endevents’              ‘endfor’                 ‘endfunction’
‘endif’                  ‘endmethods’             ‘endparfor’
‘endproperties’          ‘endswitch’              ‘endwhile’
‘enumeration’            ‘events’                 ‘for’
‘function’               ‘global’                 ‘if’
‘methods’                ‘otherwise’              ‘parfor’
‘persistent’             ‘properties’             ‘return’
‘switch’                 ‘try’                    ‘until’
‘unwind_protect’         ‘unwind_protect_cleanup’ ‘while’

   The function ‘iskeyword’ can be used to quickly check whether an
identifier is reserved by Octave.

 -- : iskeyword ()
 -- : iskeyword (NAME)
     Return true if NAME is an Octave keyword.

     If NAME is omitted, return a list of keywords.

     See also: Note: isvarname, Note: exist.