Doubt about getter in Javascript

Question

I saw studying about computed properties of Vues.js that these computed properties use getters and setters also, and studying on the get I fell into this example code on the Mozilla:

var expr = "foo";

var obj = {
   get [expr]() { 
      return "bar";
   }
};

console.log(obj.foo);      // bar

Then the doubt came to me:

• Get is only used to work with the variable value while maintaining the original value of the variable or would have some other application?

Answer 1

is only used to work with the variable value while maintaining the original value of the variable or would have more application?

No, a getter can return something only based on the state of variables or properties (private or not), not just the value of one of them. It is well in line with the Vue computed properties you quoted, it has several utilities. Since getters are functions, they can return basically anything.

For example, a getter who makes an account and returns the result:

var divisao = {
   dividendo: 10,
   divisor:   5,
   get resultado() { 
      return this.dividendo/this.divisor;
   }
};
console.log(divisao.resultado); // 2
divisao.dividendo = 50;
console.log(divisao.resultado); // 10