sample code for my first hyperskill x jetbrains project

curr-converter.js

console.log("Welcome to Currency Converter!");
console.log(`1 USD equals  1 USD
1 USD equals  113.5 JPY
1 USD equals  0.89 EUR
1 USD equals  74.36 RUB
1 USD equals  0.75 GBP`);
console.log("I can convert USD to these currencies: JPY, EUR, RUB, USD, GBP");
console.log("Type the currency you wish to convert: USD");

// currency?
let curr = "JPY";
console.log("To: " + curr);

// amount?
let amnt = 53;
console.log("Amount: " + amnt);

// convert currency
function convCurr(currency, amount) {
  let output;
  
  // check if amount is < 1 and if amount != a number
  function checks(currVal) {
    if(amount < 1) {
      output = "The amount cannot be less than 1";
    } else if(isNaN(amount)) {
      output = "The amount has to be a number";
    } else {
      output = amount * currVal;
    }
  }
  
  // check all currencies for a match
  if(currency == "JPY" || currency == "jpy") {
    checks(113.5);
  } else if(currency == "EUR" || currency == "eur") {
    checks(0.89);
  } else if(currency == "RUB" || currency == "rub") {
    checks(74.36);
  } else if(currency == "GBP" || currency == "gbp") {
    checks(0.75);
  } else if(currency == "USD" || currency == "usd") {
    checks(1);
  } else {
    output = "Unknown currency";
  }
  
  // return output
  return output;
}

// call function and store output in result
let result = convCurr(curr, amnt);

isNaN(result) ? console.log(result) : console.log(amnt + " USD equals " + result + " " + curr);