Data update

Task/Singly-linked-list-Element-insertion/Crystal/singly-linked-list-element-insertion.cr

@@ -0,0 +1,26 @@
+class Node (T)
+  property data : T
+  property next : Node(T)?
+
+  def initialize (@data, @next = nil)
+  end
+
+  def insert_after (new_data)
+    n = Node.new(new_data, @next)
+    @next = n
+  end
+
+  def to_s (io)
+    io << data << "->"
+    if @next
+      @next.to_s(io)
+    else
+      io << "."
+    end
+  end
+end
+
+n = Node.new('A', Node.new('B', Node.new('D')))
+puts n
+n.insert_after('C')
+puts n

Task/Singly-linked-list-Element-insertion/Pluto/singly-linked-list-element-insertion.pluto

@@ -0,0 +1,8 @@
+require "list"
+
+local s = slist.of("A", "B")
+local ixs = s:find("A") -- always returns an array of indices even if we only want the first
+if #ixs > 0 then
+    s:insert(ixs[1] + 1, "C")
+    print(s)
+end