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Strings

Like arrays, strings are not directly sequences, but they can be converted to them, and they also support all sequence operations on strings. Here are some examples of operations you can invoke on strings.

scala> val str = "hello"
str: java.lang.String = hello
scala> str.reverse
res6: String = olleh
scala> str.map(_.toUpper)
res7: String = HELLO
scala> str drop 3 
res8: String = lo
scala> str slice (1, 4)
res9: String = ell
scala> val s: Seq[Char] = str
s: Seq[Char] = WrappedString(h, e, l, l, o)

These operations are supported by two implicit conversions. The first, low-priority conversion maps a String to a WrappedString, which is a subclass of immutable.IndexedSeq, This conversion got applied in the last line above where a string got converted into a Seq. the other, high-priority conversion maps a string to a StringOps object, which adds all methods on immutable sequences to strings. This conversion was implicitly inserted in the method calls of reverse, map, drop, and slice in the example above.

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