current community

your communities

more stack exchange communities

Stack Exchange
tour help
careers 2.0
Take the 2-minute tour ×
Stack Overflow is a question and answer site for professional and enthusiast programmers. It's 100% free, no registration required.
up vote 0 down vote favorite

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

share|improve this question

4 Answers 4

up vote 2 down vote accepted

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"]
];
share|improve this answer
up vote 1 down vote

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"
        ]
    ];
share|improve this answer
up vote 0 down vote

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"]];
share|improve this answer
    
JavaScript doesn't have multidimensional arrays. What did you just create ? –  Khez Apr 11 '11 at 1:42
    
That's not a multidimensional array then? –  deceze Apr 11 '11 at 1:42
2  
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. –  Jacob Apr 11 '11 at 1:43
    
In very strict mathematical terms you are right, but the common usage of "multidimensional array" means "array of arrays". :) –  deceze Apr 11 '11 at 1:46
    
Not true even in programming terms. What is being created is a jagged array. –  Jacob Apr 11 '11 at 1:47
up vote 0 down vote

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]

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.