On 02/23/2011 01:57 PM, Andrei Alexandrescu wrote:
On 2/23/11 5:10 AM, Jacob Carlborg wrote:
On 2011-02-23 03:28, bearophile wrote:
This is a Scala implementation of a function that prints the carpet:
def nextCarpet(carpet: List[String]): List[String] = (
carpet.map(x => x + x + x) :::
carpet.map(x => x + x.replace('#', ' ') + x) :::
carpet.map(x => x + x + x))
def sierpinskiCarpets(n: Int) =
(Iterator.iterate(List("#"))(nextCarpet) drop n next) foreach println
Again Scala shines with its beautiful lambdas compared to Ds ugly string
version.
But then
Iterator.iterate(List("#"))(nextCarpet) drop n next) foreach println
a sort of a stuttering Yoda evokes.
lol :-)
It just requires being used to stack-based-like lingo; meaning each step is
written in chrono-logical order, from left to right. Well, actually, the
'List("#")' part looks like a useless hack, and 'Iterator.iterate' is somewhat
verbose. I'd prefere:
(sequence(["#"])(nextCarpet) drop n next) foreach println
Denis
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