> For the complete documentation index, see [llms.txt](https://sudevgeny.gitbook.io/typescript/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sudevgeny.gitbook.io/typescript/recap/references.md).

# Ссылочные типы данных

Beyond literals, any Object in JavaScript (including functions, arrays, regexp etc) are references. This means the following

## Mutations are across all references

```javascript
var foo = {};
var bar = foo; // bar is a reference to the same object

foo.baz = 123;
console.log(bar.baz); // 123
```

## Equality is for references

```javascript
var foo = {};
var bar = foo; // bar is a reference
var baz = {}; // baz is a *new object* distinct from `foo`

console.log(foo === bar); // true
console.log(foo === baz); // false
```