static S replaceVars(S s, SS map) {
  ret empty(map) ? s : join(replaceVars(javaTok(s), map));
}
  
static LS replaceVars(LS tok, SS map) {
  if (empty(map)) ret tok;
  tok = cloneList(tok);
  for (S var : keys(map))
    jreplace(tok, var, map.get(var));
  ret tok;
}

sS replaceVars(S s, O... params) {
  ret replaceVars(s, paramsToMap(params));
}