Getters and setters

This morning I was reading this web site, about getters and setters in JavaScript, and here I want to copy / paste code which I saw there:

function wrapValue(_value) {
   return {
      get value() { return _value; },
      set value(newValue) { _value = newValue; }
   };
}
 
var x = wrapValue(5);
console.log(x.value); // output 5
x.value = 7;
console.log(x.value); // output 7