how do I make a 2d array function

Question

Im trying to make a function that makes a 2d array but I have a syntax error here is the function

function asdf(col,row)
{
    let arr = new Array(col);
    let i = 0;
    for (i < col; i++)
    {
        arr[i] = new Array(row);
    }
    return arr;
}

the error is at the ")" at the end of the for loop any ideas?

Does this answer your question? [How can I create a two dimensional array in JavaScript?](https://stackoverflow.com/questions/966225/how-can-i-create-a-two-dimensional-array-in-javascript) — pilchard, Aug 27 '22 at 09:20

Khalil · Accepted Answer · 2022-08-27T09:23:57.093

2

The error is due to a missing semi-colon in the for loop:

for (i < col; i++)

Change it to

for (;i < col; i++)

A better approach can be just to simply define the loop variable in the for loop like so:

for (let i = 0;i < col; i++)

edited Aug 27 '22 at 09:23

answered Aug 27 '22 at 09:16

Khalil

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A good catch, but clearer to recommend standard syntax `for (let i = 0; i < col; i++)` – pilchard Aug 27 '22 at 09:21

score 0 · Answer 2 · answered Aug 27 '22 at 09:19

The for statement creates a loop with 3 optional expressions:

for (expression 1; expression 2; expression 3) {
  // code block to be executed
}

Expression 1 is executed (one time) before the execution of the code block.

Expression 2 defines the condition for executing the code block.

Expression 3 is executed (every time) after the code block has been executed.

There's a syntax error because you are missing Expression 1.

how do I make a 2d array function

2 Answers2