** Summary **

obtain the names of keys in an `[array]`


** Synopsis **

    :   '''array names''' ''arrayName ?mode? ?pattern?''


** See Also **

   [array]:   


** Description **

Returns a list containing the names of all of the elements in the array that
match ''pattern''. Mode may be one of '''-exact''', '''-glob''', or
'''-regexp'''. If specified, ''mode'' designates which matching rules to use to
match ''pattern'' against the names of the elements in the array. If not
specified, ''mode'' defaults to '''-glob'''. See the documentation for
'''[string match]''' for information on glob style matching, and the
documentation for '''[regexp]''' for information on regexp matching. If
''pattern'' is omitted then the command returns all of the element names in the
array. If there are no (matching) elements in the array, or if ''arrayName''
isn't the name of an array variable, then an empty string is returned.

To obtain the keys in alphabetical order:

======
foreach key [lsort [array names arr]] {...}
======


<<categories>> Tcl syntax | Command | Introspection