Anonymous user
Run-length encoding: Difference between revisions
→{{header|JavaScript}}
Line 2,959:
-> [[12,"W"],[1,"B"],[12,"W"],[3,"B"],[24,"W"],[1,"B"],[14,"W"]]
-> "WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW"</pre>
A <code>.reduce()</code> based one-liner
<lang javascript>
const rlEncode = (s: string) => s.match(/(.)\1*/g).reduce((result,char) => result+char.length+char[0],"")
const rlValidate = (s: string) => /^(\d+\D)+$/.test(s)
const rlDecode = (s: string) => rlValidate(s) ? s.match(/(\d[a-z\s])\1*/ig).reduce((res,p) => res+p[p.length-1].repeat(parseInt(p)),"") : Error("Invalid rl")
</lang>
=={{header|jq}}==
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