live-coding-test.js

/** Question 1 **/
// Factory function to create the counter object
const myCounter = (count = 0) => ({
  getState: () => count,
  inc: () => ++count,
  dec: () => --count
})

const counter = myCounter()

console.log(counter.getState()); // --> 0
counter.inc(); 
counter.inc(); 
console.log(counter.getState()); // --> 2
counter.inc(); 
console.log(counter.getState()); // --> 3
console.log(counter.inc()); // --> 4
console.log(counter.dec()); // --> 3

/** Question 2 **/
const url = "https://api.fixer.io/latest?base=EUR&symbols=USD"

const exchange = async (baseCurrency, targetCurrency) => {
  const response = await fetch(url),
    data = await response.json(),
    { base, rates } = data
    
  baseCurrency === base && rates.hasOwnProperty(targetCurrency) 
    ? console.log(rates[targetCurrency])
    : console.log("No exchange rate for this currency")
}

// Returns the exchange rate (I believe that was required)
exchange("EUR", "USD") // --> 1.2276