'''string reverse''' ''string''

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

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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:
 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

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'''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.
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[[[Tcl syntax help]|[Category Command]|[Category String Processing]]]