flatMapTo
inline
fun
<
R
,
C
:
MutableCollection
<
in
R
>
>
CharSequence
.
flatMapTo
(
destination
:
C
,
transform
:
(
Char
)
->
Iterable
<
R
>
)
:
C
(source)
Appends all elements yielded from results of transform function being invoked on each character of original char sequence, to the given destination .