Javascript multidimensional array returning wrong dimension [duplicate]

Question

I initialize an array as such:

    imgArray = [];
    imgArray[0,0] = "image1";
    imgArray[1,0] = "image2";
    imgArray[0,1] = "image3";
    imgArray[1,1] = "image4";
    imgArray[0,2] = "image5";
    imgArray[1,2] = "image6";

When I do an alert for imgArray[0,2], I get image6. When I do an alert for imgArray[0,1], I get image4. When I do an alert for imgArray[1,1], I get image4 which is correct.

It appears that the imgArray is totally ignoring my 0 dimension.

There are no multi-dimensional arrays in JavaScript. Use an array of arrays instead. — Tomalak
– Tomalak, Commented May 14, 2014 at 14:32
Your problem comes from the comma operator that gets applied to your two indices (Javascript only supports one). See JavaScript multidimensional array. — Frédéric Hamidi
– Frédéric Hamidi, Commented May 14, 2014 at 14:32
@user, on the contrary, the syntax is valid, but imgArray[1, 0] is evaluated as 1; imgArray[0] because of the comma operator. — Frédéric Hamidi
– Frédéric Hamidi, Commented May 14, 2014 at 14:34
@FrédéricHamidi this sounds interesting, can you tell us more about what is happening here and how is this syntaxically correct? — GôTô
– GôTô, Commented May 14, 2014 at 14:37

nils · Accepted Answer · 2014-05-14 14:32:21Z

5

Multidimensional Arrays in Javascript are written in seperate brackets:

imgArray = [];
imgArray[0] = [];
imgArray[1] = [];
imgArray[0][0] = "image1";
imgArray[1][0] = "image2";
imgArray[0][1] = "image3";
imgArray[1][1] = "image4";
imgArray[0][2] = "image5";
imgArray[1][2] = "image6";

answered May 14, 2014 at 14:32

nils

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3 Comments

MaxAx Over a year ago

Tried code change above, get undefined error when trying to access imgArray[1,2]. I have tried every example in all the previous posts about this same topic and they all ignore my left dimension.

nils Over a year ago

Don't try to get imgArray[1,2] (read the answers instead). The correct use is imgArray[1][2]

MaxAx Over a year ago

That worked. After so many hours looking at this BS, I guess I overlooked the details in the comments. Thank you very much.

lucassp · Accepted Answer · 2014-05-14 14:32:14Z

2

imgArray = [];
imgArray[0] = ["image1", "image2"];

Multidimensional arrays in JavaScript are simply nested arrays.

answered May 14, 2014 at 14:32

lucassp

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1 Comment

MaxAx Over a year ago

Tried this imgArray[0]=["image1.jpg","image3.jpg","image5.jpg"]; imgArray[1]=["image2.jpg","images4.jpg","image6.jpg"]; and for imgArray[0,1] I get returned everything in 1,0 which is image2, image4, image6.

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