Define static methods using the class syntax

Problem

You want to define a static method inside a “class”.

Ingredients

• 1 “class”
• 1 method
• the static keyword

Directions

1. Create a “class”.

   class SomeClass {
     constructor(property) {
       this.property = property;
     }
   }

2. Add a method to that class (at this moment it is not static).

   class SomeClass {
     constructor(property) {
       this.property = property;
     }
     someStaticMethod() {
       console.log('someStaticMethod');
     }
   }

3. Add the static keyword before the method name to make it static.

   class SomeClass {
     constructor(property) {
       this.property = property;
     }
     static someStaticMethod() {
       console.log('This is a static method');
     }
   }

4. Voilá, there you got a static method.

   SomeClass.someStaticMethod();  // "This is a static method"

Notes

• Static methods cannot be called on an instance:

  let instance = new SomeClass();
  // instance.someStaticMethod();  // won't work

• To call a static method based on an instance you need to call it via the constructor property:

  let instance = new SomeClass();
  instance.constructor.someStaticMethod();