> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/d/deepcopy.md).

# Deepcopy

`Object.dclone()` returns a deep clone of any mutable object.

```ruby
var src = Hash(foo => 0, bar => [0,1])

# Add a cyclic reference
src{:baz} = src

# Make a deep clone
var dst = src.dclone

# The address of src
say src.object_id
say src{:baz}.object_id

# The address of dst
say dst.object_id
say dst{:baz}.object_id
```

#### Output:

```
15154128
15154128
25296304
25296304
```