TypeError: setting getter-only property "x"

"use strict";

function Archiver() {
  var temperature = null;
  Object.defineProperty(this, "temperature", {
    get: function () {
      console.log("get!");
      return temperature;
    },
  });
}

var arc = new Archiver();
arc.temperature; // 'get!'

arc.temperature = 30;
// TypeError: setting getter-only property "temperature"

"use strict";

function Archiver() {
  var temperature = null;
  var archive = [];

  Object.defineProperty(this, "temperature", {
    get: function () {
      console.log("get!");
      return temperature;
    },
    set: function (value) {
      temperature = value;
      archive.push({ val: temperature });
    },
  });

  this.getArchive = function () {
    return archive;
  };
}

var arc = new Archiver();
arc.temperature; // 'get!'
arc.temperature = 11;
arc.temperature = 13;
arc.getArchive(); // [{ val: 11 }, { val: 13 }]