Count all occurrences of a char within a string

Question

Does Scala have a native way to count all occurrences of a character in a string?

If so, how do I do it?

If not, do I need to use Java? If so, how do I do that?

Thanks!

Answer 1

"hello".count(_ == 'l') // returns 2 

Answer 2

i don't use Scala or even java but google search for "Scala string" brought me to here

which contains :

def count (p: (Char) ⇒ Boolean): Int Counts the number of elements in the string which satisfy a predicate. p the predicate used to test elements. returns the number of elements satisfying the predicate p. Definition Classes TraversableOnce → GenTraversableOnce 

Seems pretty straight forward but i dont use Scala so don't know the syntax of calling a member function. May be more overhead than needed this way because it looks like it can search for a sequence of characters. read on a different result page a string can be changed into a sequence of characters and you can probably easily loop through them and increase a counter.