FCC_cashRegProject.js

const UNITS = {
  'ONE HUNDRED': 100,
  'TWENTY': 20,
  'TEN': 10,
  'FIVE': 5,
  'ONE': 1,
  'QUARTER': 0.25,
  'DIME': 0.1,
  'NICKEL': 0.05,
  'PENNY': 0.01
};

function copy(o) {
  var output, v, key;
  output = Array.isArray(o) ? [] : {};
  for (key in o) {
    v = o[key];
    output[key] = (typeof v === "object" && v !== null) ? copy(v) : v;
  }
  return output;
}
function getChange(due, arr) {
  let ret = {status: '', change: []};
  let draw = copy(arr);
  let change = draw.reverse().map(e => {
    let ele1 = 0;
    let element;
    if(due >= UNITS[e[0]] && [e[1]] > 0) {
      while(e[1] >= UNITS[e[0]] && (due - UNITS[e[0]]) >= 0) {
        e[1] -= UNITS[e[0]];  //update old element
        e[1] = Math.round(e[1] * 100) / 100;
        due -= UNITS[e[0]];   //update due ammount
        due = Math.round(due * 100) / 100;
        ele1 += UNITS[e[0]]; //load new element
        ele1 = Math.round(ele1 * 100) / 100;
      }
      element = [e[0], ele1];
      return element;
    }
        
  }).filter(e => e !== undefined);
  if(draw.filter(e => e[1] !== 0).length === 0) {
    ret.change = [];
  } else ret.change = change;
  return [ret,due];
}

function addStatus(obj,cid) {
  if(obj[0].hasOwnProperty('change') && obj[0].hasOwnProperty('status')) {
    if(obj[1] === 0) {
      if(obj[0].change.length > 0 ) return {status: 'OPEN', change: obj[0].change};
      else return {status: 'CLOSED', change: cid};
    }
    else return {status: 'INSUFFICIENT_FUNDS', change: []};
  }
  else return 'Properties not found';
}

function checkCashRegister(price, cash, cid) {
  return addStatus(getChange((cash-price), cid), cid);
}

checkCashRegister(3.26, 100, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1],
  ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]]))