Object-Oriented Programming/Properties/JavaScript

index.js

// This program demonstrates use of the Temperature class.

const Temperature = require("./temperature");

main();

// Runs the main program.
function main() {
    let temperature = new Temperature({celsius: 37});
    console.log(temperature.fahrenheit);

    temperature = new Temperature({fahrenheit: 98.6});
    console.log(temperature.celsius);

    temperature = new Temperature();
    temperature.celsius = 37;
    console.log(temperature.fahrenheit);

    temperature = new Temperature();
    temperature.fahrenheit = 98.6
    console.log(temperature.celsius);

    temperature = new Temperature();
    console.log(temperature.toCelsius(98.6));
    console.log(temperature.toFahrenheit(37));
}

temperature.js

// Temperature converter. Provides temperature conversion functions. Supports Fahrenheit and Celius temperatures.
//
// Examples:
//    let temperature = new Temperature({celsius: 37});
//    console.log(temperature.fahrenheit);
//
//    temperature = new Temperature({fahrenheit: 98.6});
//    console.log(temperature.celsius);
//
//    temperature = new Temperature();
//    temperature.celsius = 37;
//    console.log(temperature.fahrenheit);
//
//    temperature = new Temperature();
//    temperature.fahrenheit = 98.6
//    console.log(temperature.celsius);
//
//    temperature = new Temperature();
//    console.log(temperature.toCelsius(98.6));
//    console.log(temperature.toFahrenheit(37));
//
// References:
//    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes
//    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/get
//    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/set
//    https://www.smashingmagazine.com/2016/07/how-to-use-arguments-and-parameters-in-ecmascript-6/

class Temperature
{
    _celsius = undefined;
    _fahrenheit = undefined;

    constructor({celsius, fahrenheit} = {}) {
        if (celsius != undefined) {
            this.celsius = celsius;
        }

        if (fahrenheit != undefined) {
            this.fahrenheit = fahrenheit
        }
    }

    // Returns Celsius value.
    get celsius() {
        return this._celsius;
    }

    // Sets Celsius value.
    set celsius(value) {
        this._celsius = value;
        this._fahrenheit = this.toFahrenheit(value);
    }

    // Returns Fahrenheit value.
    get fahrenheit() {
        return this._fahrenheit;
    }

    // Sets Fahrenheit value.
    set fahrenheit(value) {
        this._fahrenheit = value;
        this._celsius = this.toCelsius(value);
    }

    // Converts Fahrenheit temperature to Celsius.
    toCelsius(fahrenheit) {
        return (fahrenheit - 32) * 5 / 9;
    }

    // Converts Celsius temperature to Fahrenheit.
    toFahrenheit(celsius) {
        return celsius * 9 / 5 + 32;
    }
}

module.exports = Temperature;

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Copy and paste the code above into one of the following free online development environments or use your own JavaScript compiler / interpreter / IDE.

index.js

temperature.js

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