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August 14, 2016 08:31
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Count the number of occurrences in a string over consumption
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| def countOccurrences (s: String): String = s span (x => x == s.head) match { | |
| case ("", "") => "" | |
| case (fw, rest) => fw.length.toString + fw.head ++ countOccurrences(rest) | |
| } | |
| countOccurrences("") // "" | |
| countOccurrences("aaa") // "3a" | |
| countOccurrences("aaabbb") // "3a3b" | |
| countOccurrences("aaabbbccchhhhhhddddhhhheee") // "3a3b3c6h4d4h3e" |
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