Can Javascript Count Letter Frequency?

Such as:

<script>
//code

aaaa

zzzz

ccc
</script>

Counts will be produced: a=4, z=4, c=3. The is not for web site
uploading, but just to get statistics for own research. All data will
be in plain text. Everything will happen in a single computer, no
Internet, nor ISP.

I believe it is not a difficult job for a programing language, such as
C. With the MS Word the letters can be counted one type at a time. But
that is rather slow. Maybe Javascript can do the work so efficiently
as a fully-fledged programing language.