score:3
Accepted answer
indexof
can return -1
(str
can contain not only latin letters).
/** finds index of first occurrence of some value in this $coll.
*
* @param elem the element value to search for.
* @tparam b the type of the element `elem`.
* @return the index of the first element of this $coll that is equal (as determined by `==`)
* to `elem`, or `-1`, if none exists.
*
* @usecase def indexof(elem: a): int
* @inheritdoc
*
* $maynotterminateinf
*
*/
def indexof[b >: a](elem: b): int = indexof(elem, 0)
Source: stackoverflow.com
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