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The J language isn't particularly strong in string manipulation. You can get an easy solution this way:

reverseWords =: (,' '&,)&:>/@:|.@:;: reverseWords ' one two three four ' four three two one
but it sort of feels like cheating because of the use of the ;: verb which breaks a string to J tokens.

A solution without this cheating is (I have replaced the tab character with a hat for legibility):

reverseWord1 =: [:(,' '&,)&:>/@:|.@:-.&a:e.&' ^'<@}.;.1] reverseWord1 ' one two three^four ' four three two one
Another solution is:
reverseWord2 =: [:}.@;@|.e.&' ^'<@(' '&,@}.`(0$])@.(2>#));.1] reverseWord2 ' one two three^four ' four three two one

In reply to Re: Five Ways to Reverse a String of Words (C#, Perl 5, Perl 6, Ruby, Haskell) by ambrus
in thread Five Ways to Reverse a String of Words (C#, Perl 5, Perl 6, Ruby, Haskell) by eyepopslikeamosquito

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