'use strict';

const containerValue = Symbol('containerValue');

class Container {

constructor(value) {

Object.defineProperty(this, containerValue, {

configurable: false,

enumerable: false,

writable: false,

value,

});

}

getValue() {

return this[containerValue];

}

}

// Usage

const container1 = new Container(150);

console.dir({ container1 });

console.log('container1.getValue() =', container1.getValue());

const person = { name: 'Marcus', born: 121, city: 'Roma' };

const container2 = new Container({ person });

console.dir({ container2 });

console.log('container2.getValue() =', container2.getValue());