'''[http://www.tcl.tk/man/tcl/TclCmd/string.htm#M42%|%string reverse]''' , a
subcommand of the [Tcl Commands%|%built-in] [string] command, reverses strings



** Synopsis **

    :   '''string reverse''' ''string''



** Description **

Returns a string containing the characters of its input argument, ''string'',
in reverse order.

Implemented in the [Changes in Tcl/Tk 8.5], as part of [TIP]
#272[http://tip.tcl.tk/272.html].

Workaround substitute for 8.4:

======none
proc string'reverse str {
   set res {}
   set i [string length $str]
   while {$i > 0} {append res [string index $str [incr i -1]]}
   set res
} ;# RS
% string'reverse "hello, world"
dlrow ,olleh
======

----

'''Implementation notes'''

This command converts its argument to the "unicode" object type so that it
doesn't have to use Tcl_UtfPrev() masses of times.



** See Also **

   [SYStems]:  contains a discussion on reversing strings



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