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ECMAScript 2015, also known as ES6, introduced JavaScript Classes. JavaScript Classes are templates for JavaScript Objects.
Use the keyword class to create a class. Always add a method named constructor().
The constructor() method is called automatically when a new object is created.
class ClassName {
constructor() { ... }
}
class Car {
constructor(name, year) {
this.name = name;
this.year = year;
}
}
The example above creates a class named "Car". 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);
myCar.age();
You can send parameters to Class methods.
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);
myCar.age(year);
The syntax in classes must be written in "strict mode". You will get an error if you do not follow the "strict mode" rules.
class Car {
constructor(name, year) {
this.name = name;
this.year = year;
}
age() {
// date = new Date(); // This will not work
const date = new Date(); // This will work
return date.getFullYear() - this.year;
}
}
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