JavaScript Examples
Dave Braunschweig
Objects
// This class converts temperature between Celsius and Fahrenheit. // It may be used by assigning a value to either Celsius or Fahrenheit // and then retrieving the other value, or by calling the ToCelsius or // ToFahrenheit methods directly. class Temperature { constructor() { this._celsius = 0; this._fahrenheit = 32; } get celsius() { return this._celsius; } set celsius(value) { this._celsius = value; this._fahrenheit = this.toFahrenheit(value); } get fahrenheit() { return this._fahrenheit; } set fahrenheit(value) { this._fahrenheit = value; this._celsius = this.toCelsius(value); } toCelsius(fahrenheit) { return (fahrenheit - 32) * 5 / 9 } toFahrenheit(celsius) { return celsius * 9 / 5 + 32 } } // This program creates instances of the Temperature class to convert Celsius // and Fahrenheit temperatures. // // References: // https://www.mathsisfun.com/temperature-conversion.html // https://en.wikibooks.org/wiki/JavaScript main() function main() { var temp1 = new Temperature(); temp1.celsius = 0 output("temp1.celsius = " + temp1.celsius); output("temp1.fahrenheit = " + temp1.fahrenheit); output(""); temp1.celsius = 100; output("temp1.celsius = " + temp1.celsius); output("temp1.fahrenheit = " + temp1.fahrenheit); output(""); var temp2 = new Temperature(); temp2.fahrenheit = 0 output("temp2.fahrenheit = " + temp2.fahrenheit); output("temp2.celsius = " + temp2.celsius); output(""); temp2.fahrenheit = 100; output("temp2.fahrenheit = " + temp2.fahrenheit); output("temp2.celsius = " + temp2.celsius); } function output(text) { if (typeof document === 'object') { document.write(text); } else if (typeof console === 'object') { console.log(text); } else { print(text); } }
Output
temp1.celsius = 0 temp1.fahrenheit = 32 temp1.celsius = 100 temp1.fahrenheit = 212 temp2.fahrenheit = 0 temp2.celsius = -17.77777777777778 temp2.fahrenheit = 100 temp2.celsius = 37.77777777777778