class_docstr: "A Printer to convert Python expressions to strings of JavaScript code
      
code: def _get_loop_opening_ending(self, indices):
      open_lines = []
      close_lines = []
      loopstart = "for (var %(varble)s=%(start)s; %(varble)s<%(end)s; %(varble)s++){"
      for i in indices:
          # Javascript arrays start at 0 and end at dimension-1
          open_lines.append(
              loopstart
              % {
                  "varble": self._print(i.label),
                  "start": self._print(i.lower),
                  "end": self._print(i.upper + 1),
              }
          )
          close_lines.append("}")
      return open_lines, close_lines
  
imports: from __future__ import annotations
  from typing import Any
  from sympy.core import S
  from sympy.core.numbers import equal_valued
  from sympy.printing.codeprinter import CodePrinter
  from sympy.printing.precedence import precedence, PRECEDENCE
label_desc: Use image node_id 8 for calling the JavascriptCodePrinter obj's underlying member method code with example usage: obj._get_loop_opening_ending(indices) and returns: open_lines,  close_lines