The problem in define javascript multidimensional array

Question

this is my javascript code which for defining multidimensional array

    var array = new Array(2);
    for (i = 0; i < array.length; i++) {
        array[0] = new Array(4);
    }
    array[0][0] = "name1";
    array[0][1] = "property1";
    array[0][2] = "value1";
    array[0][3] = "0";

    //this is where the error happened
    array[1][0] = "name2";
    array[1][1] = "property2";
    array[1][2] = "value2";
    array[1][3] = "1";

but the firebug tell me an error: array[1] is not defined

which I mark in the code above

But the array[0][] I could defined,and give them value,

So why the problem happened in this place?Thank you

deceze · Accepted Answer · 2011-04-11 01:41:45Z

2

array[0] = new Array(4) should be array[i] = new Array(4).

This can be done much more succinctly with array literals though:

var array = [
    ["name1", "property1", "value1", "0"],
    ["name2", "property2", "value2", "1"]
];

answered Apr 11, 2011 at 1:41

deceze♦

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Comments

Jonathan · Accepted Answer · 2011-04-11 01:41:35Z

2

Your loop is redefining the first member of the array.

var array = new Array(2);
for (i = 0; i < array.length; i++) {
    array[i] = new Array(4);
}
array[0][0] = "name1";
array[0][1] = "property1";
array[0][2] = "value1";
array[0][3] = "0";

//this is where the error happened
array[1][0] = "name2";
array[1][1] = "property2";
array[1][2] = "value2";
array[1][3] = "1";

If this is all you are doing you can to it using shorthand syntax

var array = [
        [
            "name1",
            "property1",
            "value1",
            "0"
        ],
        [
            "name2",
            "property2",
            "value2",
            "1"
        ]
    ];

answered Apr 11, 2011 at 1:41

Jonathan

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Comments

Jacob · Accepted Answer · 2011-04-11 01:41:53Z

0

JavaScript doesn't have multidimensional arrays. However, you can have arrays of arrays. Here's how you can create what you're looking for:

var array = [
    ["name1", "property1", "value1", "0"],
    ["name2", "property2", "value2", "1"]];

answered Apr 11, 2011 at 1:41

Jacob

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5 Comments

Khez Over a year ago

JavaScript doesn't have multidimensional arrays. What did you just create ?

deceze Over a year ago

That's not a multidimensional array then?

Jacob Over a year ago

Why the downvote? Arrays of arrays are not the same thing as multidimensional arrays. A multidimensional array is an array with two fixed dimensions; JavaScript only has one-dimensional arrays which can contain other arrays as members.

deceze Over a year ago

In very strict mathematical terms you are right, but the common usage of "multidimensional array" means "array of arrays". :)

Jacob Over a year ago

Not true even in programming terms. What is being created is a jagged array.

Wayne · Accepted Answer · 2011-04-11 01:42:28Z

0

Notice:

for (i = 0; i < array.length; i++) {
    array[0] = new Array(4);
}

You're always initializing array[0] but I think you mean to say array[i]

answered Apr 11, 2011 at 1:42

Wayne

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