Object Descriptors & Property Flags

What temperature values result from the Fahrenheit-Celsius conversion?

function Temperature(celsius) {
  Object.defineProperties(this, {
    celsius: {
      get() { return celsius; },
      set(value) { celsius = value; },
      enumerable: true
    },
    fahrenheit: {
      get() { return celsius * 9/5 + 32; },
      set(value) { celsius = (value - 32) * 5/9; },
      enumerable: true
    }
  });
}

const temp = new Temperature(25);
console.log(temp.celsius, temp.fahrenheit);
temp.fahrenheit = 68;
console.log(temp.celsius);

25, 77 then 25
25, 77 then 20
The console will log '25, 77' then '20' because: 1) Initially celsius is 25, so fahrenheit is 25 * 9/5 + 32 = 77, 2) Setting fahrenheit to 68 triggers its setter, which converts to celsius as (68 - 32) * 5/9 = 20, 3) The internal celsius variable is updated to 20, 4) The final log shows this updated celsius value, 5) This demonstrates using accessors to maintain consistent relationships between properties, 6) The pattern ensures values stay in sync regardless of which property is updated, 7) It's useful for creating objects with interdependent properties that respect domain rules.
25, 77 then 68
25, 77 then 77

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