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JavaScript Classes are templates for JavaScript Objects. Classes were introduced in ES6.
Use the keyword class to create a class. It is a good practice to always add a method named constructor().
class ClassName {
constructor() { ... }
}
The class has two initial properties: "name" and "year". A JavaScript class is not an object. It is a template for JavaScript objects.
When you have a class, you can use the class to create objects.
const myCar1 = new Car("Ford", 2014);
const myCar2 = new Car("Audi", 2019);
The constructor method is a special method:
If you do not define a constructor method, JavaScript will add an empty constructor method.
Class methods are created with the same syntax as object methods.
Use the keyword class to create a class.
Always add a constructor() method.
Then add any number of methods.
class ClassName {
constructor() { ... }
method_1() { ... }
method_2() { ... }
method_3() { ... }
}
class Car {
constructor(name, year) {
this.name = name;
this.year = year;
}
age() {
const date = new Date();
return date.getFullYear() - this.year;
}
}
const myCar = new Car("Ford", 2014);
document.getElementById("demo").innerHTML =
"My car is " + myCar.age() + " years old.";
class Car {
constructor(name, year) {
this.name = name;
this.year = year;
}
age(x) {
return x - this.year;
}
}
const date = new Date();
let year = date.getFullYear();
const myCar = new Car("Ford", 2014);
document.getElementById("demo").innerHTML=
"My car is " + myCar.age(year) + " years old.";
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