Alert Closure

alert_closure.js

const abductionAlert = (city) => {
    const title = "Greetings Earthlings! The Current Alien Abduction Count in " 
                    + `${city}` + " Is: ";
    
    let count = 0;
    const alertFactory = () => {
        alert(`${title} ${++count}`);
    }
    
    return alertFactory;
}

const abductionEventInSF = abductionAlert('San Francisco');
const abductionEventInPA = abductionAlert('Palo Alto');

abductionEventInSF(); // -> count = 1
abductionEventInPA(); // -> count = 1
abductionEventInSF(); // -> count = 2