Slice not working for nested arrays? How can I avoid mutilation

JavaScript
1

I can’t figure out how to stop mutilating my val and my cid arrays. I have tried to slice them into separate variables a thousand different ways. What’s the proper way of avoiding mutilation of my arrays?

  **Your code so far**


function checkCashRegister(price, cash, cid) {

var val = [];
val = [["PENNY", .01],
["NICKEL", .05],
["DIME", .1],
["QUARTER", .25],
["ONE", 1],
["FIVE", 5],
["TEN", 10],
["TWENTY", 20],
["HUNDRED", 100]];

const calcQuant = (arr) => {
  for (let i in val) {
    arr[i][1] = arr[i][1] / (val[i][1] * 100);
    arr[i][1] = arr[i][1].toFixed(2) * 100;
  }
  return arr;
}
const calcVal = (arr) => {
  for (let i in val) {
    arr[i][1] = arr[i][1] * (val[i][1] * 100);
    arr[i][1] = arr[i][1].toFixed(2) / 100;
  }
  return arr;
}
let j = 8
let owed = (cash - price).toFixed(2);
do {
  change += calcQuant(cid[j][1])
  owed -= calcVal(cid[j][1])
  if (owed > calcVal()) {
    break;
  }
  else {
    j--;
    if (j === 0 || owed <= 0)
      return change;
  }
break;
}
while (owed > val[j][1]);
console.log(change)

var change;
return change;
}

checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]]);

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36

Challenge: Cash Register

Link to the challenge:

2

I’m not sure I understand what’s the problem. Could you give and example of what is (incorrectly) happening and what would you want to happen instead?

4

Yeah, so I’m trying to avoid mutilation of my ‘val’ and ‘cid’. It seems they’re being mutilated somewhere along the code because some of the outputs that I’m getting are really absurd. I normally would create a clone of the array by using the slice method but all that returns is an empty array.

var x = val.slice() // []
var y = cid.slice // []

Thanks for your swift reply!

Edit: Okay wait. So if I do

var y = cid.slice()

and then run my function calcQuant(y);
console.log(cid) changes and returns the same output that y does.

5

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