Design a cash register drawer function checkCashRegister() that accepts purchase price as the first argument (price), payment as the second argument (cash), and cash-in-drawer (cid) as the third argument. cid is a 2D array listing available currency. Return the string "Insufficient Funds" if cash-in-drawer is less than the change due. Return the…

exact-change.js

/* UPDATED NOVEMBER 2021 to work with the latest FreeCodeCamp tests
Design a cash register drawer function checkCashRegister() that accepts purchase price as the first argument (price), 
payment as the second argument (cash), and cash-in-drawer (cid) as the third argument.
cid is a 2D array listing available currency.
The checkCashRegister() function should always return an object with a status key and a change key.
Return {status: "INSUFFICIENT_FUNDS", change: []} if cash-in-drawer is less than the change due, or if you cannot return 
the exact change.
Return {status: "CLOSED", change: [...]} with cash-in-drawer as the value for the key change if it is equal to the change due.
Otherwise, return {status: "OPEN", change: [...]}, with the change due in coins and bills, sorted in highest to lowest order,
as the value of the change key.
*/

function checkCashRegister(price, cash, cid) {
  //change all decimals to whole numbers for ease
  //First work out how much change is needed
  var change = (cash * 100) - (price * 100);
  var currentStatus = '';
  
  //Next work out how much cash there is in the cash register using
  //reduce to add all the values and turn to whole numbers
  var totalCash = cid.reduce(function(accum, current){
    accum = accum + (current[1]*100);
    return accum;
  }, 0);
  
  //Next set up the coins array/object with empty values, 
  //and the coin denomination, e.g Penny = 1 and dollar = 100 pennies
  var coins = [
    {name: "ONE HUNDRED", value: 0, denomination: 10000},
    {name: "TWENTY", value: 0, denomination: 2000},
    {name: "TEN", value: 0, denomination: 1000},
    {name: "FIVE", value: 0, denomination: 500},
    {name: "ONE", value: 0, denomination: 100},
    {name: "QUARTER", value: 0, denomination: 25},
    {name: "DIME", value: 0, denomination: 10},
    {name: "NICKEL", value: 0, denomination: 5},
    {name: "PENNY", value: 0, denomination: 1},
    ];
  
  //from the info passed to the function add the values for each coin into
  //the cash register objects.
  coins.map(function(element){
    for(var i = 0; i < cid.length; i++){
      if(cid[i][0] === element.name){
        element.value = parseFloat(Number(cid[i][1]*100).toFixed()); //remove decimals
      }
    }
  });

  //to work out the change/number of coins to be given as change
  //set up a variable to hold the new array
  var changeDue = [];
  
  //Check that there is enough change in the register
  if(change > totalCash){
    currentStatus = "INSUFFICIENT_FUNDS";
  }
  //if all change is returned close the register
  else if(change === totalCash){
    currentStatus = "CLOSED";
    // loop over the coins to return the cash in drawer
    for(var cs = 0; cs<coins.length; cs++){
      var name = coins[cs].name;
      var value = coins[cs].value;
      changeDue.push([name, value/100]);
    }
    //reverse the object so that lowest denomination is first
    cash = changeDue.reverse();
    //and return the result
    return {status: currentStatus, change: cash};
  }
  //there is change...
  else{
    currentStatus = "OPEN";
  }
  
  //loop over the coins array of objects and check coin values against the change
  //needed.
  for(var j = 0; j<coins.length; j++){
    var name = coins[j].name;
    var value = coins[j].value;
    var denom = coins[j].denomination;

    //if change can be divided by the coins denomination and is greater than one coin
    //and the value of the coins is not 0 and change is not 0
    if(change/denom >=1 && value > denom && change !== 0){
      var coinNum = Math.floor(value/denom); //the number of coins there are
      var amount = Math.floor(change/denom); //the number of coins needed
      //if there are more coins than needed the actual value is the number of coins
      //multiplied by the coin denomination (e.g. 5 x 25p).
      if(coinNum > amount){
        amount = amount * denom;
      }
      else{ //else take the full value
        amount = coinNum * denom;
      }
      
      change = change - amount; //reduce the change by the value taken out
      amount = parseFloat(Number(amount/100).toFixed(2)); //decimalize the amount
      changeDue.push([name, amount]);  //add to array
    }  
    
  }
  //if there wasn't enough change in the correct coins:
  if(changeDue.length === 0){
    currentStatus = "INSUFFICIENT_FUNDS";
  }
  
  // Here is your change, ma'am.
  return {status: currentStatus, change: changeDue};
}

// 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(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]]);

not working

@rlniranjan9 is correct that this solution does not pass the current freecodecamp.com challenge. A great opportunity to investigate this script which does 99% of the heavy lifting.

not workink

not workink

Yes. Investigate it and decide for yourself the solution. This code does most of the work.

Thanks for the comments @coffeeguy01 and @ngimdock, I have now updated the script to run with the latest FreeCodeCamp tests. (This was originally done a while ago.)