javascript declare multidimensional array with specified indices

Question

I want to create a multidimensional array that will eventually look like this:

s
    [4]
        [3]
            [7][235,25903,502935],
            [8][2973,20385,97250],
            [9][293,2752,2935]
        [4]
            [7][28357,2057,923705],
            [8][2398,20597,20579],
            [9][275,23975,203795]

In PHP this is very easy to do, but in javascript I keep getting some BS about the 2nd dimension being undefined:

var s = [];
    s[4][3][7] = [23095,20753,2067];
    s[4][3][8] = [2664,86295,29357];

(that is not how I would do this in PHP btw)

Travesty3 · Accepted Answer · 2012-09-21 19:46:11Z

2

You have to declare each nested array as an Array before you can assign values to it:

var s = [];
s[4] = [];
s[4][3] = [];
s[4][3][7] = [23095,20753,2067];
s[4][3][8] = [2664,86295,29357];

answered Sep 21, 2012 at 19:46

Travesty3

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4 Comments

Shmiddty Over a year ago

You should note that iterating over this array may not be straightforward.

Travesty3 Over a year ago

I assumed that the OP wasn't concerned about iterating over it, since the question title explicitly states that he wants "specific indices."

Jakob Jingleheimer Over a year ago

@Travesty: Ugh! I was afraid of that. what BS… Thanks!

Jakob Jingleheimer Over a year ago

Oh, ignore this comment—firebug just displayed it as [undefined,undefined[undefined]…] but when I fully expanded s everything was there. Thanks!

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