Update map-number-range.md

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Yusof Bandar
2019-02-18 14:24:55 +00:00
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### mapNumRange
Maps a number range to another number range.
Maps a number from one range to another range.
Returns a number mapped from the in range to the out range.
Returns a mapped num from the in range to the out range.
```js
const mapNumRange = (num, in_min, in_max, out_min, out_max) => {