advent_of_code_2022

commit 01de598936366d6e7cc24cad17f4522704790462
parent 3124dadd09fe9eedf3d9eab85596ceb4dc99c74d
Author: Eamon Caddigan <eamon.caddigan@gmail.com>
Date:   Thu,  8 Dec 2022 10:43:50 -0800

Just making my code cuter.

Ported over some stuff (specifically, Iterators.product() and mapreduce()) that
I learned about working part 2 to my part 1 code. I can't claim it's more
readable, and I haven't looked to see if it runs faster or anything.

Diffstat:
M
src/day_8.jl
 | 
16
++++++++++------

1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/src/day_8.jl b/src/day_8.jl
@@ -32,18 +32,22 @@ function cumismax(x)
     result
 end
 
-# Return the tallest trees
+# Return the tallest trees when viewed from one direction
 function visible_here(trees, dims, doreverse)
-    trees = doreverse ? reverse(trees, dims = dims) : trees
+    if doreverse
+        trees = reverse(trees, dims = dims)
+    end
     istallest =  mapslices(cumismax, trees, dims = dims)
     doreverse ? reverse(istallest, dims = dims) : istallest
 end
 
+# Return the trees visible from any direction
 function visible_anywhere(trees)
-    visible_here(trees, 1, false) .|
-        visible_here(trees, 1, true) .|
-        visible_here(trees, 2, false) .|
-        visible_here(trees, 2, true)
+    mapreduce(
+        (x)->visible_here(trees, x[1], x[2]),
+        (x, y)->x .| y,
+        Iterators.product((1, 2), (false, true))
+    )
 end
 
 function part_1(input)