javaScript in 19.1

A Java pre proc in a .xlt as below used to work in 6.2.  Can’t get it to work in 19.1.  do I need to install a box (javaScriptandPython)?  if so, I cannot find it in 19.1

worked in 6.2 after javaScriptandPython box install-

cljXLTStrings {CLASS JavascriptStringXlateBeta} {XLT_STYLE SINGLE} {javascript {
// this is a comment
//using JS slice and indexOf methods!
//just an example – you really wouldn’t do this.
var pos = inVal.indexOf(“-“);  // find position of first ‘-‘ in SSN
var res = inVal.slice(pos);  //res =  “-nn-nnn”
outVal = res;  //return “-nn-nnnn” to PID-19

}}