Can u give me some advice, how to make cash register?

1

I need most efficiency logic for returning cash for change?
Just some “pseudo” explanation…

2

Here is a pseudo answer that will get you past the tests

// var changeOwed = difference between cash given and price

// loop through your cash register array and sum up the total dollar amount of all the money you have in your drawer
// if total is less than changeOwed return insufficient funds
// else if total === changeOwed then return Closed
// else calculate change owed by doing the following
// find the biggest possible change that you have available that is below the changeOwed
// subtract this amount from changeOwed
// add this amount to your array of payments
// subtract this amount from your cash drawer (so if $1 is the highest amount then take $1 out of cash drawer
// repeat until you have gone through the smallest coin you have available in your cash drawer
// if after going through all coins you find that your changeOwed is > $0.00 then return insuffient funds
// else if changeOwed is $0.00 then return your array of coins you will give as change

Hope that helps.

2 Likes
3

What is wrong with this penny, all the other tests works but this one, here is code:

function checkCashRegister(price, cash, cid) {
      var change;
      
      change = cash - price;
      
      if ( change === getSum(cid) )
        return "Closed";
      
      var changeForMaAm = [];
      
        for( var i = cid.length - 1; i >= 0; i -- ){
          
          
        var offset = getDivider(cid[i][0], cid[i][1]);
        var valueToReturn = 0; 
         
        for ( var y  = 0 ; y < offset[0]; y ++ ){
          if ( change - offset[1] < 0 )
            break;
          else {
            change -= offset[1];
            valueToReturn+= offset[1];
          }
            
          
        }

          if ( valueToReturn !== 0)
             changeForMaAm.push([cid[i][0], valueToReturn]);
          
          
          
          if ( change === 0 )
            break;
        
          valueToReturn = 0;
          
      }
      
      
      /*  COMMENT THIS FOR THIS TEST, BECAUSE THERE IS REST OF MONEY SOMETHING VERY SMALL 
       
      if ( change > 0 )    
        return "Insufficient Funds";
      */
      // Here is your change, ma'am.
      return changeForMaAm;
    }

    function getSum(cid){
      
      var total = 0;
      
      for ( var i = 0; i < cid.length; i ++ ){
        
        total += cid[i][1];
        
      }
      
      return total;
    }

    // return sum div name, and name in digit
    function getDivider(name, value){
      
      switch(name){
          
        case "ONE HUNDRED":
          return [value / 100, 100];
        case "TWENTY":
          return [value / 20, 20];
        case "TEN":
          return [value / 10, 10];
        case "FIVE":
          return [value / 5, 5];
        case "ONE":
          return [value, 1];
        case "QUARTER":
          return [value / 0.25, 0.25];
        case "DIME":
          return [value / 0.1, 0.10];
        case "NICKEL":
          return [value / 0.05, 0.05];
        case "PENNY":
          return [value / 0.01, 0.01];
        default:
          console.log("Error");
      }
      
    }

    // Example cash-in-drawer array:
    // [["PENNY", 1.01],
    // ["NICKEL", 2.05],
    // ["DIME",
 3.10],
    // ["QUARTER", 4.25],
    // ["ONE", 90.00],
    // ["FIVE", 55.00],
    // ["TEN", 20.00],
    // ["TWENTY", 60.00],
    // ["ONE HUNDRED", 100.00]]

    checkCashRegister(3.26, 100.00, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.10], ["QUARTER", 4.25], ["ONE", 90.00], ["FIVE", 55.00], ["TEN", 20.00], ["TWENTY", 60.00], ["ONE HUNDRED", 100.00]]);