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scala option map filter
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| val a : Option[String] = Some("333") | |
| //a: Option[String] = Some(333) | |
| a.filter(_.length > 1).map(_.length) | |
| //Option[Int] = Some(3) | |
| a.filter(_.length > 6).map(_.length) | |
| //Option[Int] = None | |
| //filter and map function is just for Option type it's just a monad | |
| //def filter(p: A => Boolean): Option[A] | |
| //def map[B](f: A => B): Option[B] |
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