JavaScript Algorithms and Data Structures Projects - Cash Register

JavaScript
1

Tell us what’s happening:

Hi everyone,

So I don’t know what’s wrong with the i value between the 2 internal whiles inside the outer one. At the point it was supposed to be 7 out of the first internal while and then execute the second internal while and decrease to 6. When it is 6 it should get out of the second internal while and operate the arrays as i=6:

sum+=grade[i];
changeArr[i][1]+=grade[i];
cid[i][1]-=grade[i];

but when it gets inside the second while it just decreases and decreases to i=-1.
I would appreciate a little help here. Thank you.

Your code so far

function checkCashRegister(price, cash, cid) {
  let grade=[0.01,0.05,0.1,0.25,1,5,10,20,100,Infinity];
  let change=cash-price;
  let changeArr=[["PENNY", 0], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]];
  let sum=0;
  while(sum<change) {
    let i=0;
    while(sum+grade[i+1]<=change) {
      i+=1;
    }
    while(cid[i][1]==0) {
      i-=1;
      if(i=-1) {
        console.log({status: "INSUFFICIENT_FUNDS", change: []},cid);
        return {status: "INSUFFICIENT_FUNDS", change: []};
      }
    }
    sum+=grade[i];
    changeArr[i][1]+=grade[i];
    cid[i][1]-=grade[i];
  }
  if(cid.every(function(x) {return x[1]==0;})) {
    console.log({status: "CLOSED", change: changeArr});
    return {status: "CLOSED", change: changeArr};
  } else {
    console.log({status: "OPEN", change: changeArr.filter(function(x) {return x[1]>0;})});
    return {status: "OPEN", change: changeArr.filter(function(x) {return x[1]>0;})};
  }
}

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]]);

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Challenge Information:

JavaScript Algorithms and Data Structures Projects - Cash Register

2

Looks like the condition right here.

3

OMFG thanks! How is that if condition not showing me a syntax error though???

4

I agree that it should be a syntax error in the JS Compiler, but that assignment statement really returns the value that was assigned to that variable. So, since -1 is a truthy value (non-zero, non-null, etc.), that return statement, as you wrote it, returns as true always.

5

God I should have notice it…I just don’t since the minus sign that made it look like it was just the right length, so my eyes just got over it. But I mean i remember JS showing me syntax errors in similar cases before, I dindn’t know it was not the case inside a while or if conditional. It just allowed me to assign values inside a while…that’s crazy

1 Like
6

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