how can I call a method only one time in a class? (first time when add "new")

Question

I have a long code with a lot method, but since I am on stackoverflow I will add to you a simple minimal example here (is not the final, but I hope show you the bug):

I have a code like this:

 class MyClass { constructor() { this.myMethod(); } myMethod() { console.log("hello world;") } } new MyClass();

and this code is ok.

the method runs once.

but if I call it more than 2+ times it will run the method another time.

/* other code  */
new MyClass();
new MyClass();
new MyClass();
new MyClass();
new MyClass();

// wrong output:
hello world
hello world 
hello world
...

// desired output (only one time)
hello world

if you are interested in why run one time. this is because I want that the class created some Ui elements at the first but then get the generated ui and change the things with the given parameters in constructor

Answer 1

check this documentation: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/static

there is a keyword for classes that do this thing called static

 class MyClass { // no () just static and { your code } static { console.log("called once"); } myOtherMethod() { console.log("run when I want or every time") } } /* other code */ new MyClass(); new MyClass(); new MyClass(); new MyClass(); new MyClass();