JavaScript Class static Keyword

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Example

Create a static method and call it on the class:

class Car {
constructor(brand) {
this.carname = brand;
}
static hello() { // static method
return "Hello!!";
}
}

mycar = new Car("Ford");

//Call 'hello()' on the class Car:
document.getElementById("demo").innerHTML = Car.hello();

//and NOT on the 'mycar' object:
//document.getElementById("demo").innerHTML = mycar.hello();
//this would raise an error.

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Definition and Usage

The static keyword defines static methods for classes.

Static methods are called directly on the class (Car from the example above) - without creating an instance/object (mycar) of the class.

Browser Support

Keyword
static	49.0	13.0	45.0	9.0	36.0

Syntax

static methodName()

Technical Details

JavaScript Version:	ECMAScript 2015 (ES6)

More Examples

If you want to use the mycar object, inside the static method, you can send it as a parameter:

Example

Send "mycar" as a parameter:

class Car {
constructor(brand) {
this.carname = brand;
}
static hello(x) {
return "Hello " + x.carname;
}
}

mycar = new Car("Ford");

document.getElementById("demo").innerHTML = Car.hello(mycar);

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JavaScript Tutorial: JavaScript Classes

JavaScript Tutorial: JavaScript ES6 (EcmaScript 2015)

JavaScript Reference: The constructor() method

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