title: if statement not working correctly? JS
body: <p>I am currently using an array for a menu and using if statements for each option. The problem i have found is if the first option i select uses an if statement that is below an option i ask later, it doesn't give a result.</p>
  
  <p>For example. If i add credit, and then the next option i select to view current credit, it does not complete that task and shows nothing?</p>
  
  <p>Any help would be appreciated!</p>
  
  <p>Kind Regards.</p>
  
  <pre><code>var readlineSync = require('readline-sync')
  var credit = 0;
  var removeCredit = 0;
  
  menu = [];
  menu[0] = "Purchase a product";
  menu[1] = "View your credit";
  menu[2] = "Add credit";
  menu[3] = "Retrieve a refund";
  
  index = readlineSync.keyInSelect(menu, 'Please choose your option');
  
  if (index == [1]) {
  console.log("The total amount of credit you have is: £", credit);
  index = readlineSync.keyInSelect(menu, 'Please choose your option');
  }
  
  if (index == [2]) {
  var credit = readlineSync.questionInt('How much credit would you like to purchase? ');
  console.log("The total amount of credit you have is: £" + (credit));
  index = readlineSync.keyInSelect(menu, 'Please choose your option');
  }
  
  if (index == [3]) {
  var removeCredit = readlineSync.questionInt('How much credit would you like to remove? ');
  console.log("This credit has now been removed, your total available credit is: £" + (credit - removeCredit));
  index = readlineSync.keyInSelect(menu, 'Please choose your option');
  }
  </code></pre>