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Add hints to phone-number exercise #226

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Dec 2, 2016
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Add hints to phone-number exercise #226

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9 changes: 9 additions & 0 deletions exercises/phone-number/HINTS.md
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## Hints
For simplicity and readability: Consider using the Scala collection functions instead of Java's `String` methods. Remember that in Scala a `String` is implicitly also a `Seq[Char]`, so you can call them as easily as the `String` methods.

Some examples:
- `filter` instead of `replaceAll`
- `take`, `takeRight`, `drop`, `head`, `tail` instead of `substring`

Another idea worth exploring might be to change the `String` into a `List[Char]`
and then use [pattern matching](http://alvinalexander.com/scala/how-to-use-lists-nil-cons-scala-match-case-expressions) with the `::` operator.