Update mapNumRange.md

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Angelos Chalaris
2019-02-23 11:25:11 +02:00
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Maps a number from one range to another range.
Returns `num` mapped between `out_min`-`out_max` from `in_min`-`in_max`
Returns `num` mapped between `out_min`-`out_max` from `in_min`-`in_max`.
```js
const distance = (num, in_min, in_max, out_min, out_max) => (num - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
```