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HTML

              
                <button id="start">Start listening</button>
<br>
<button id="stop">Stop listening</button>
<br>
<!-- Stop otiginal button>Stop listening</button -->
<br>
<a href="https://stackoverflow.com/a/55760290/2741415">https://stackoverflow.com/a/55760290/2741415</a>
              
            
!

CSS

              
                
              
            
!

JS

              
                /** @Bloco original do criador */

class Observable {
 constructor(exec) {
  this.listeners = new Set();

  exec({
   next: (value) => this.listeners.forEach(({ next }) => next && next(value)),
   error: (err) => this.listeners.forEach(({ error }) => error && error(err)),
   complete: () =>
    this.listeners.forEach(({ complete }) => complete && complete())
  });
 }

 subscribe(listeners) {
  this.listeners.add(listeners);

  return {
   unsubscribe: () => this.listeners.delete(listeners)
  };
 }
}

/** @Bloco original do criador */

// Create an Observable instead of a Promise;
const interval = new Observable(({ next }) => {
 setInterval(() => next("Hello"), 1000);
});

// Subscribe to that Observable
/* comentado para não executar ao abrir
const subscription = interval.subscribe({
 next: (data) => console.log(data)
});
*/

// Optionally use the returned subscription object to stop listening
/* Comentado para tentar os testes
document
 .querySelector("button")
 .addEventListener("click", subscription.unsubscribe);
*/

/** @Bloco original do criador */

/** @Bloco modificado para os testes */

// Subscribe to that Observable
function subscription() {
 interval.subscribe({
  next: (data) => console.log(data) // Como posso travar a execução aqui dentro, diretamente quando receber um dado esperado?
 });
}

// Start a Subscription
document.getElementById("start").addEventListener("click", subscription);

// Stop a Subscription
document
 .getElementById("stop")
 .addEventListener("click", subscription.unsubscribe); // Ou como posso chamar uma outra função de stop que pode ser um botão ou não?

              
            
!
999px

Console