In javascript, I have these two approaches to group similar methods:

first approach:

class GroupedMethodsWithClass {
  static a = () => {
    console.log("a")
  };

  static b = () => {
    console.log("b")
  }
}

and the second one:

const GroupedMethodsWithObject = {
  a() {
    console.log("a");
  },
  b() {
    console.log("b");
  },
}

Right now I only know that I have the class static initialization block option with first approach:

class GroupedMethodsWithClass {
  static a = () => {
      console.log("a")
  }
  static b = () => {
      console.log("b")
  }
  static {
    console.log('Class static initialization block called');
  }
}

But does anyone knows what are the real differences between these two approaches?