411 REFERENCE · Wikibooks
Programming Fundamentals/Object Examples JavaScript
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
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
References
Wikiversity: Computer Programming