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## Is
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### Instructions
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Add new function properties to the object `is` to check a value type
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- `is.num` value is a number
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- `is.nan` value is NaN
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- `is.str` value is a string
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- `is.bool` value is a boolean
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- `is.undef` value is undefined
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- `is.def` value is defined
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- `is.arr` value is an array
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- `is.obj` value is a simple object or null objects
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- `is.fun` value is a function
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- `is.truthy` value is truthy
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- `is.falsy` value is falsy
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### Notions
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- [https://nan-academy.github.io/js-training/examples/primitive-and-operators](https://nan-academy.github.io/js-training/examples/primitive-and-operators)
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- [https://devdocs.io/javascript/operators/typeof](https://devdocs.io/javascript/operators/typeof)
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- [https://developer.mozilla.org/en-US/docs/Glossary/Truthy](https://developer.mozilla.org/en-US/docs/Glossary/Truthy)
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- [https://developer.mozilla.org/en-US/docs/Glossary/Falsy](https://developer.mozilla.org/en-US/docs/Glossary/Falsy)
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### Code provided
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> all code provided will be added to your solution and doesn't need to be submited.
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```js
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const is = {}
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```
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