Singly-linked list/Element definition: Difference between revisions

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@@ Line 421: / Line 421: @@
 =={{header|Ruby}}==
-<lang ruby>  class ListNode
+<lang ruby>class ListNode
-    attr_accessor :value, :succ
+  attr_accessor :value, :succ
-    def initialize(v,s=nil)
+  def initialize(value, succ=nil)
-      self.value=v
-      self.succ=s
+    self.value = value
+    self.succ = succ
+  end
+  def each(&b)
+    yield self
+    succ.each(&b) if succ
+  end
+  include Enumerable
+  def self.from_array(ary)
+    head = self.new(ary[0], nil)
+    prev = head
+    ary[1..-1].each do |val|
+      node = self.new(val, nil)
+      prev.succ = node
+      prev = node
     end
-    def each(&b)
+    head
+  end
-      yield value
+end
-      succ.each(&b) if succ
-    end
+list = ListNode.from_array([1,2,3,4])</lang>
-    include Enumerable
-  end</lang>
 =={{header|Scheme}}==