Run-length encoding: Difference between revisions

=={{header|Arturo}}==

<lang rebol>runlengthEncode: function [s][

join map chunk split s => [&] 'x ->

(to :string size x) ++ first x

]

runlengthDecode: function [s][

result: new ""

loop (chunk split s 'x -> positive? size match x {/\d+/}) [a,b] ->

'result ++ repeat first b to :integer join to [:string] a

return result

]

str: "WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW"

encoded: runlengthEncode str

print ["encoded:" encoded]

decoded: runlengthDecode encoded

print ["decoded:" decoded]

if decoded=str -> print "\nSuccess!"</lang>

{{out}}

<pre>encoded: 12W1B12W3B24W1B14W

decoded: WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW

Success!</pre>