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// program2.js

const _name = Symbol('name')

const _instance = Symbol('instance')

class Singleton {

constructor() {

this[_name] = null

this[_instance] = null

}

setName(name) {

this[_name] = name

}

getName() {

return this[_name]

}

getInstance() {

if (!this[_instance]) this[_instance] = new Singleton()

return this[_instance]

}

}

var object = new Singleton

var instance1 = object.getInstance()

instance1.setName('steven1')

var instance2 = object.getInstance()

instance2.setName('steven2')

console.log(instance1 === instance2) // true