Bonfire: Exact change... http://www.freecodecamp.com/challenges/bonfire-exact-change

readme.md

My current attempt at the exact-change bonfire from FCC.

I was stuck on a rounding error FOREVER. I had to refer to the solution to figure out why I was coming up ONE PENNY SHORT!!!!!

exact-change.js

function drawer(price, cash, cid) {
  
  var totalCid = cid.map(function(each) {return each[1];})
                    .reduce(function(a, b) {return a + b;});
  
  var inDrawer = cid.map(function(each) {return [each[0], getCurrencyTotals(each)];});
  
  var totalDue = cash - price;

  if(totalDue > totalCid) {
    return 'Insufficient Funds';
  } else if(totalCid === totalDue) {
    return 'Closed';
  }
  
  var exactChange = [];
  
  for(var i = cid.length-1; i >= 0; i--) {
    var value = 0;
    
    //console.log(currency[inDrawer[i][0]]);   
    while(inDrawer[i][1] > 0 && currency[inDrawer[i][0]] <= totalDue) {
      totalDue -= +currency[inDrawer[i][0]];
      inDrawer[i][1] -= 1;
      value += currency[inDrawer[i][0]];
      //console.log(value);
      
      totalDue = Math.round(totalDue * 100) /100;
    }
    
    if(value > 0) {
      exactChange.push([cid[i][0], +value.toFixed(2)]);
    }
    
  }
  
  if(exactChange.length < 1 || totalDue > 0) {
    return "Insufficient Funds";
  }
  
  return exactChange;
}

var currency = {
  "PENNY": 0.01,
  "NICKEL": 0.05,
  "DIME": 0.10,
  "QUARTER": 0.25,
  "ONE": 1.00,
  "FIVE": 5.00,
  "TEN": 10.00,
  "TWENTY": 20.00,
  "ONE HUNDRED": 100.00
};
          
function getCurrencyTotals(cid) {
  return +(cid[1] / currency[cid[0]]).toFixed(0);
}

// 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]]

drawer(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]]);
//drawer(19.50, 20.00, [["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]]);