Being relatively new to cross-language compilation, how are one language's class APIs typically translated into another?

For example :

   [1,2,3].shuffle 

[turns into] =>

   (function() {
     var __opal = Opal, self = __opal.top, __scope = __opal, nil = __opal.nil, __breaker = __opal.breaker, __slice = __opal.slice;
  
     return [1, 2, 3].$shuffle()
   })();

Of course, since JS arrays do not have a "shuffle" method, the output reads :

   TypeError: Object 1,2,3 has no method '$shuffle'

Is the answer to simply use class/object methods that are present in both languages?