Hello,

I dont understand the base of the problem. it says the function creates m rows and n columns, meaning we should have m rows while it only has 1 row but m subarrays. does not make any sense to me.

please advise.

thanks

```
**Your code so far**
```

```
function zeroArray(m, n) {
// Creates a 2-D array with m rows and n columns of zeroes
let newArray = [];
let row = [];
for (let i = 0; i < m; i++) {
// Adds the m-th row into newArray
row=[]
for (let j = 0; j < n; j++) {
// Pushes n zeroes into the current row to create the columns
row.push(0);
}
// Pushes the current row, which now has n zeroes in it, to the array
newArray.push(row);
}
return newArray;
}
let matrix = zeroArray(3, 2);
console.log(matrix);
```

```
**Your browser information:**
```

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36`

**Challenge:** Debugging - Use Caution When Reinitializing Variables Inside a Loop

**Link to the challenge:**

this code will give you this output:

```
[ [ 0, 0 ], [ 0, 0 ], [ 0, 0 ] ]
```

each subarray here - it represents a row

number of elements in each subarray - its number of columns

If I will rewrite this output in more… I don’t know… more like I has been taught to write matrix in high school:

```
[
[ 0, 0 ],
[ 0, 0 ],
[ 0, 0 ]
]
```

maybe it will help to deal with some confusion.

1 Like

it does not have 1 row

subarrays and rows are kinda the same thing here. Thus it has m rows

1 Like

Thank you it really helped. but still if we consider each subarray one item, then we have one column (n=1 not 2). Can you explain that too?

No, we have exactly n columns.

Lets modify function you posted:

```
function zeroArray(m, n) {
// Creates a 2-D array with m rows and n columns of zeroes
let newArray = [];
let row = [];
for (let i = 0; i < m; i++) {
// Adds the m-th row into newArray
row=[]
for (let j = 0; j < n; j++) {
// Pushes n zeroes into the current row to create the columns
row.push(String(i) + ',' + String(j));
}
// Pushes the current row, which now has n zeroes in it, to the array
newArray.push(row);
}
return newArray;
}
let matrix = zeroArray(3, 2);
console.log(matrix);
/* OUTPUT
[ [ '0,0', '0,1' ],
[ '1,0', '1,1' ],
[ '2,0', '2,1' ] ];
*/
```

I changed some stuff - actually just one line - where we pushing elements in subarrays

so now you can see that every element of every sub array represents one specific element of matrix,

and every element has two , you can say, coordinates -

first coordinate represents row,

second coordinate represents column

1 Like