text: var a = 123;
  var obj = {
    a,
    hello: "world",
    3.14: 1592,
    show_hello: function () { console.log("this.hello =", this.hello) }
  };
  console.log( obj.hello )
  console.log( obj.a )
  obj.show_hello()
  console.log( obj[3.14] )
  obj[123] = 456
  console.log(obj[123])
  