Scale a number into a defined range


/ Published in: Ruby
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Scales a number from a given range into a specific range, as explained [in this Stack Overflow](http://stackoverflow.com/questions/5294955/how-to-scale-down-a-range-of-numbers-with-a-known-min-and-max-value) post.

Just call it, for example like:

0.5.scale_between(0, 1, 100, 200)

The result would be `150`.

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