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## Declarations
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### Instructions
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Create the following constant variables:
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- `escapeStr`: a `string` which contains the following special characters: `` ` ``, `\`, `/`, `"` and `'`.
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- `arr`: an array containing the values `4` and `'2'`.
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- `obj`: an object containing primitive values:
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- `str`: with a `string` value.
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- `num`: with a `number` value.
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- `bool`: with a `boolean` value.
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- `undef`: with a `undefined` value.
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- `nested`: an object containing:
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- `arr`: an array of 3 values: `4`, `undefined` and `'2'`.
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- `obj`: an object with 3 properties
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- `str` with a `string` value.
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- `num` with a `number` value.
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- `bool` with a `boolean` value.
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`nested`, `arr` and `obj` must be frozen, so that their elements or properties cannot be changed.
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### Notions
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- Primitive and Operators
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- Variables
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- [Data Structures](https://nan-academy.github.io/js-training/examples/data-structures.js)
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- [Freeze](https://devdocs.io/javascript/global_objects/object/freeze)
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