Day 5: Reduce code duplication

5.rb

@@ -1,38 +1,27 @@
 @input = File.read("5.input").split("\n")
-
-def stacks()
-  return @input.filter {|line| line.include?("[")}.map{|line| line.chars.each_slice(4).to_a.map{|block| block[1]}}.transpose.map{|stack| stack.filter{|box| box != " "}.reverse}
-end
-
 @instrs = @input.filter{|line| line.include?("move")}.map{|line| line.split(/[a-z ]+/)}
 
-def part1()
-  stacks = stacks()
+def run_part
+  stacks = @input.filter {|line| line.include?("[")}.map{|line| line.chars.each_slice(4).to_a.map{|block| block[1]}}.transpose.map{|stack| stack.filter{|box| box != " "}.reverse}
 
   @instrs.each do |inst|
     (_, cnt, from, to) = inst.map{|i| i.to_i}
-
-    (1..cnt).each do |_|
-      box = stacks[from - 1].pop()
-      stacks[to - 1].append(box)
-    end
+    yield stacks, cnt, from - 1, to - 1
   end
 
   puts stacks.map{|s| s[-1]}.join()
 end
 
-def part2()
-  stacks = stacks()
-
-  @instrs.each do |inst|
-    (_, cnt, from, to) = inst.map{|i| i.to_i}
-
-    boxes = stacks[from - 1].pop(cnt)
-    stacks[to - 1] = stacks[to - 1].concat(boxes)
+# Part 1
+run_part do |stacks, cnt, from, to|
+  (1..cnt).each do |_|
+    box = stacks[from].pop()
+    stacks[to].append(box)
   end
-
-  puts stacks.map{|s| s[-1]}.join()
 end
 
-part1()
-part2()
+# Part 2
+run_part do |stacks, cnt, from, to|
+  boxes = stacks[from].pop(cnt)
+  stacks[to] = stacks[to].concat(boxes)
+end