[help] FCC beta Challenge Cash register

1

Hello, i need help with this exercice:
https://beta.freecodecamp.org/en/challenges/javascript-algorithms-and-data-structures-projects/cash-register

I have a specific question:
I calcul the range like this:
let change = (cash - price).toFixed(2);

I want to play with my numbers after ‘,’ numbers. Here, if i do this:
let aDecimal = parseInt( change.toString().split(".")[1] ); //50
I have 50. Now,i do this:
aDecimal = parseFloat(“0.”+aDecimal);
So i have this 0.5
But if i have 0.5.toString()[2] != 0 && 0.5.toString()[3] == undefined, i want this to have an extra “0” but i want at the end a number type like this 0.50 (number type, not a string).

If some one could help me on this. I’m having seisur.
I tried to do the exercice with full number as decimal like this “50” for 50 cents. But it should be easier to calcul some thing else the other way.

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2

Could you please share your code? If you use repl.it, you can paste the link here and it will run right here in the forum.

4

Hi, ok i’m doing to past a part of my code.

edit:

If you can teach me a way to basicaly have this:
50 => 0.5 => 0.50
5 => 0.05

5

Hello everybody, everybody hello

7

Hi,
because i’m doing operation one it later on.
Now, i’m doing calcul with the cent like this:
i have 0.50 but i use 50.
Then for 0.25, i use 25, for 0.10 i use 10…

8

Why not just multiply/divide it by 100 then?

9

If i 50/100 i have 0.5 float. But it is not a problem to do calcul if it doesn’t show 0.50 ?

10

If I remember correctly, this challenge expects numbers rather than strings. 0.5 is a number. If I am wrong and you need a string with "0.50" then you can still use the number 0.5 throughout your code and then do a parseInt() at the end to convert it to "0.50".

11

Hi back.
Ok, i finished the exercice:

It’s maybe not the right way, it’s maybe too long and could be optimized but at least i used what i thought and make it happen:)

How:
-Retrieve Integer/fractional change and Cash register integer/factional values
-Check for fractional and integer value with the cash registers values if you have enough funds
-if yes, work on the integer and fractional. If no, leave it no fund
-If at the end, your array is empty => closed / not empty => you still have money in the cash machin

/*
Link: https://beta.freecodecamp.org/en/challenges/javascript-algorithms-and-data-structures-projects/cash-register
*/

function checkCashRegister(price, cash, cid) {
    //find the change (use toFixed)
    let change = (cash - price).toFixed(2); //0.50 centimes
    //find the number before ',' (Integer part) (convert it to String to find it, then Integer)
    let bDecimal = parseInt( change.toString().split(".")[0] );
    //find the number after ',' (Fractional part) (convert it to String to find it, then Integer)
    let aDecimal = parseInt( change.toString().split(".")[1] ) / 100;
    //How many my cash register have in the range of values 100, 20, 10, 5 and 1
    let unitArray = [ cid[8][1], cid[7][1], cid[6][1], cid[5][1], cid[4][1] ];
    //How many my cash register have in the range of 0.25, 0.10, 0.02 and 0.01
    let unitArray2 = [ cid[3][1], cid[2][1], cid[1][1], cid[0][1] ];
    //The change of how many of each i have to give (only concern 100, 20, 10, 5, and 1)
    let unitArrayChange = [ ["ONE HUNDRED", 0], ["TWENTY", 0], ["TEN", 0], ["FIVE", 0], ["ONE", 0] ];
	//The change of how many of each i have to give (only concern 0.25, 0.10, 0.05 and 0.01)
	let unitArrayChange2 = [ ["QUARTER", 0], ["DIME", 0], ["NICKEL", 0], ["PENNY", 0] ];
	
	//Copies to do maths
	let unitArrayChangeNew1 = [ ["ONE HUNDRED", 0], ["TWENTY", 0], ["TEN", 0], ["FIVE", 0], ["ONE", 0] ];	
	let unitArrayChangeNew2 = [ ["QUARTER", 0], ["DIME", 0], ["NICKEL", 0], ["PENNY", 0] ];
	
    let changeFactor = 0;
	let unitIndex = 0;
	
	let calc1 = 0;
	let calc2 = 0;

	//In the cash register, i check how many "Integer money" i have
	for( let k = 0; k < unitArray.length; k++ ) {
		calc1 += unitArray[k];
		
		//In the cash register, i check how many "Fractional money" i have
		for( let k = 0; k < unitArray2.length; k++ ) {
			calc2 += unitArray2[k];
		}
	}
	
	//To start with, if i don't have enough Integer money OR Fractional Money
	if( ( bDecimal > calc1 )  || ( aDecimal > calc2 ) ) {
		return {status: "INSUFFICIENT_FUNDS", change: []};
	}
	
	/*
	WORK ON INTEGER VALUES
	While my change is not ZERO and my cash register machin is not EMPTY
	I continue to check for every values possibles
	I update my cash register and my change
	*/
    while( bDecimal > 0 ) {
		if( ( bDecimal >= 100 ) && ( unitArray[0] >= 100 ) ){
			changeFactor = 100;
			unitIndex = 0;
		} else if( ( bDecimal >= 20 ) && ( unitArray[1] >= 20 ) ) {
			changeFactor = 20;
			unitIndex = 1;
		} else if( ( bDecimal >= 10 )  && ( unitArray[2] >= 10 ) ){
			changeFactor = 10;
			unitIndex = 2;
		} else if( ( bDecimal >= 5 ) && ( unitArray[3] >= 5 ) ){
			changeFactor = 5;
			unitIndex = 3;
		} else if( ( bDecimal >= 1 ) && ( unitArray[4] >= 1 ) ){
			changeFactor = 1;
			unitIndex = 4;
		} else {
			// break;
		}
		
		// update my bDecimal (Integer change)
		bDecimal = bDecimal - changeFactor;
		// update my cash register machine
		unitArray[unitIndex] = unitArray[unitIndex] - changeFactor;
		// update how MANY of this money i used
		unitArrayChange[unitIndex][1] = unitArrayChange[unitIndex][1] + 1;
		//use the precedent value to calcul how MUCH of this money i used
		unitArrayChangeNew1[unitIndex][1] = unitArrayChange[unitIndex][1] * changeFactor;
    }

	//reset
	changeFactor = 0;
	unitIndex = 0;
	
	
	/*
	WORK ON FRACTIONAL VALUES
	While my change is not ZERO and my cash register machin is not EMPTY
	I continue to check for every values possibles
	I update my cash register and my change
	*/
	while( aDecimal > 0 ) {
		if( ( aDecimal >= 0.25 ) && ( unitArray2[0] >= 0.25 ) ){
			changeFactor = 0.25;
			unitIndex = 0;
		} else if( ( aDecimal >= 0.10 ) && ( unitArray2[1] >= 0.10 )  ) {
			changeFactor = 0.10;
			unitIndex = 1;
		} else if( ( aDecimal >= 0.05 ) && ( unitArray2[2] >= 0.05 )  ){
			changeFactor = 0.05;
			unitIndex = 2;
		} else if( ( aDecimal >= 0.01 ) && ( unitArray2[3] >= 0.01 )  ){
			changeFactor = 0.01;
			unitIndex = 3;
		} else {
			//break;
		}
		
		//update my bDecimal (Fractional change)
		aDecimal = aDecimal - changeFactor;
		
		//update my cash register machine (use parseFloat and toFixed to manage float Calcul)
		let valueFixed = parseFloat( unitArray2[unitIndex] - changeFactor ).toFixed( 2 );
		unitArray2[unitIndex] = parseFloat( valueFixed );
		
		// update how MANY of this money i used
		unitArrayChange2[unitIndex][1] = unitArrayChange2[unitIndex][1] + 1;
		
		//Find how MUCH of this money i used (use parseFloat and toFixed to manage float Calcul)
		let valueFixed2 = (unitArrayChange2[ unitIndex][1] * changeFactor ).toFixed( 2 );
		unitArrayChangeNew2[unitIndex][1] = parseFloat( valueFixed2 );
		
    }
	
	//concat my Integer and Fractional value from my cash register
	var unitArray3 = unitArray.concat( unitArray2 );
	
	//delet empty value to check if cash register machin is empty or not later on
	unitArray3 = unitArray3.filter( function( x ){
		return ( x !== 0 );
	} );
	
	//Concat my two array into one
	var unitArrayChangeNew3 = unitArrayChangeNew1.concat( unitArrayChangeNew2 );
	
	//Then EMPTY "0" values
	for( let k = 0; k < unitArrayChangeNew3.length; k++ ) {
		if( unitArrayChangeNew3[k][1] == 0 ) {
			unitArrayChangeNew3[k].splice( 0, 1 );
			delete unitArrayChangeNew3[k];
		}
	}
	//Then REMOVE "empty" values
	unitArrayChangeNew3 = unitArrayChangeNew3.filter( function( x ){
		return ( x !== ( undefined || null || '' ) );
	} );
	
	//Handle if my register machin is empty or not
	if( unitArray3.length == 0 ) {	
		return {status: "CLOSED", change: cid};
	}else {
		return {status: "OPEN", change: unitArrayChangeNew3};
	}
};

console.log( 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]]));
console.log( 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]]) );
console.log( checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]) );
console.log( checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]) );
console.log( checkCashRegister(19.5, 20, [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]) );

ps: thanks to “@Sweet Coding :)” for the tips

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