Another style for the currency converter (v2)

doings.js

let currencies = [
    {
      name: "JPY",
      val: 113.5,
    },
    {
      name: "EUR",
      val: 0.89,
    },
    {
      name: "RUB",
      val: 74.36,
    },
    {
      name: "GBP",
      val: 0.75,
    },
    {
      name: "USD",
      val: 1,
    }
  ];

console.log("Welcome to Currency Converter!");
for(let i = 0; i < currencies.length; i++) {
  console.log("1 USD equals  " + currencies[i].val + " " + currencies[i].name);
}
console.log("What do you want to convert?");

let fromCurrency = "EUR";

(function checkCurrency(fCurr) {
  const findFromCurrency = currencies.find(currency => currency.name === fCurr);
  if(!(findFromCurrency === undefined)) {
    // true
    // console.log("from currency is found");
    const toCurrency = "GBP".toUpperCase();

    // check if toCurrency exist
    const findToCurrency = currencies.find(currency => currency.name === toCurrency);
    if(!(findToCurrency === undefined)) {
      // true
      // console.log("the currency is: " + findToCurrency.name);
      convertCurrency(findFromCurrency.name, findFromCurrency.val, findToCurrency.name, findToCurrency.val);
    } else {
      // false
      console.log("Unknown currency");
    }
  } else {
    // false
    console.log("Unknown currency");
  }
}(fromCurrency.toUpperCase()));

function convertCurrency(fCurrName, fCurrVal, tCurrName, tCurrVal) {
  let amount = 25;

  // check amount
  if(amount < 1) {
    result = "The amount can not be less than 1";
  } else if(isNaN(amount)) {
    result = "The amount has to be a number";
  } else {
    // go ahead and convert
    result = amount * tCurrVal / fCurrVal;
  }

  isNaN(result) ? console.log(result) : console.log("Result: " + amount + " " + fCurrName + " equals " + parseFloat(result).toFixed(4) + " " + tCurrName);
}