reimplement Array#delete in ruby

mrblib/array.rb

@@ -191,11 +191,32 @@ class Array
   #
   # Delete element with index +key+
   def delete(key, &block)
-    while i = self.index(key)
-      self.delete_at(i)
-      ret = key
+    ret = key
+    i = 0
+    j = 0
+    len = self.length
+    while i < len
+      elem = self[i]
+
+      if key == elem
+        ret = elem
+        i += 1
+        next
+      end
+
+      self[j] = elem if i != j
+
+      i += 1
+      j += 1
     end
-    return block.call if ret.nil? && block
+
+    if i == j
+      return block.call if block
+      return nil
+    end
+
+    self.replace(self[0...j])
+
     ret
   end