## Declarations

### Instructions

Create the following constant variables:

- `escapeStr`, that contains the following specials characters: `` ` ``, `\`, `/`, `"`, `'`
- `arr` that is an array containing the values 4 and '2'
- `obj` that is an object containing a property for each primitives:
  - `str` for `String`
  - `num` for `Number`
  - `bool` for `Boolean`
  - `undef` for `undefined`
- `nested` that contains
  - arr: an array of the 3 values: 4, undefined, '2'
  - obj: an object with 3 property (str, num & bool)

`nested`, `arr` and `obj` must be frozen to prevent changes from them.

### Notions

- Primitive and Operators
- Variables
- [nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [devdocs.io/javascript/global_objects/object/freeze](https://devdocs.io/javascript/global_objects/object/freeze)