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## Cut Corners
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### Instructions
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Create some functions which behave like JavaScript's `Math` rounding functions:
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- `round`: which behaves similar to `Math.round()`.
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- `ceil`: which behaves similar to `Math.ceil()`.
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- `floor`: which behaves similar to `Math.floor()`.
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- `trunc`: which behaves similar to `Math.trunc()`.
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> Some restrictions apply:
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>
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> - You may not use strings conversion to do it
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> - No bitwise operator
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> - No `%` operator
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### Usage
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```js
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const nums = [3.7, -3.7, 3.1, -3.1]
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console.log(nums.map(round))
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console.log(nums.map(floor))
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console.log(nums.map(trunc))
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console.log(nums.map(ceil))
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```
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Output:
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```console
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[ 4, -4, 3, -3 ]
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[ 3, -4, 3, -4 ]
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[ 3, -3, 3, -3 ]
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[ 4, -3, 4, -3 ]
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```
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### Notions
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- [Math](https://devdocs.io/javascript/global_objects/math)
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### Code provided
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> The provided code will be added to your solution, and does not need to be submitted.
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```js
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Math.round = Math.ceil = Math.floor = Math.trunc = undefined
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```
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