support for question https://stackoverflow.com/questions/65347745/print-rectangular-with-in-js/65347801?noredirect=1#comment115529360_65347801

Uxxankyun.js

let Uxxankyun = {
  a: 8,
  b: 6,
  draw: function(x) {
    document.write("<pre>");
    if (x) {
      for (let i = 0; i < this.a; i++) {
        for (let j = 0; j < this.b; j++) {
          document.write(" * ")
        }
        document.write(" <br> ")
      }
      document.write("<br>")
    } else {
      for (let i = 0; i <= this.a; i++) {
        for (let j = 0; j <= this.b; j++) {
          if (i == 0 || j == 0 || j == this.b || i == this.a || j == this.a) {
            document.write("* ")
          } else {
            document.write("  ");
          }
        }
        document.write("<br>")
      }
    }
    document.write("</pre>");
  }
}
Uxxankyun.draw(false)