Reverse String in M4

Welcome to the Reverse String in M4 page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

divert(-1)
dnl Commas are intepreted as argument separators, so need to change them to something that
dnl won't appear in the argument and then change them back
define(`escape', `translit(``$1'', `,', `«')')
define(`unescape', `translit(``$1'', `«', `,')')

dnl reverse(str)
define(`reverse', `unescape(_reverse(escape(`$1')))')
define(`_reverse', `ifelse(len(`$1'), 0, , `_reverse(substr(`$1', 1))`'substr(`$1', 0, 1)')')
divert(0)dnl
ifelse(ARGC, 0, , `reverse(ARGV1)')

Reverse String in M4 was written by:

• rzuckerm

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

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How to Run the Solution

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