Created
October 16, 2013 09:20
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[Scala] Merge sort with implicit parameter used for comparing elements in a list. Making prameter implicit will cause compiler will discover type of elements in a list to be sorted.
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object MergeSort { | |
def msort[T](xs: List[T])(implicit ord: Ordering[T]): List[T] = { | |
def merge(xs: List[T], ys: List[T]): List[T] = (xs, ys) match { | |
case (Nil, ys) => ys | |
case (xs, Nil) => xs | |
case (x :: xs1, y :: ys1) => | |
if (ord.lt(x, y)) x :: merge(xs1, ys) else y :: merge(xs, ys1) | |
} | |
val n = xs.length / 2 | |
if (n == 0) xs | |
else { | |
val (fst, snd) = xs splitAt n | |
merge(msort(fst), msort(snd)) | |
} | |
} | |
def main(args: Array[String]) = { | |
val list = MergeSort.msort(List(4, 5, 7, 33, 6)) | |
for (l <- list) | |
print(l + " ") | |
} | |
} |
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