if I define a multi-dimentional javascript array like this

//var myStack = new Array(3);  
// *** edit ***
var myStack = {};  

What is the best way to insert one value at a time?

myStack[1][1][0] = myValue;

I want to read a database and write one value at a time. Example:

myStack[recordNo][1]['FirstName'] = myValue;

if I define a multi-dimentional javascript array like this

//var myStack = new Array(3);  
// *** edit ***
var myStack = {};  

What is the best way to insert one value at a time?

myStack[1][1][0] = myValue;

I want to read a database and write one value at a time. Example:

myStack[recordNo][1]['FirstName'] = myValue;

• javascript
• arrays

• 6 var myStack = new Array(3); does not define a 3-dimensional array, it creates a 1-dimensional array with 3 entries – Dexygen Commented Dec 25, 2011 at 18:05

4 Answers 4

Inserting a single value can be done through one line of code:

myStack[1] = [,[value]];

Or, the long-winded way:

myStack[1] = [];
myStack[1][1] = [];
myStack[1][1][0] = value;

Either method will populate the array myStack with multiple arrays, and finally set the desired value, as requested at the question.

EDIT: As a response to the updated question, the following can be used:

myStack[recordNo] = [,{'FirstName': myValue}];

To avoid dealing with an array index for every dimensions (which could lead to mistakes if you don't pay attention for a second), you can use a push approach. It makes it easier to read / debug, especially when you have a great number of dimensions :

// some constants for navigation purpose
var FIELD_FNAME=0;
var FIELD_LNAME=1;
var FIELD_JOB=2;

// initialize your stack
var myStack=[];

// create a new row
var row = [];

var fname = "Peter";
row.push(fname);

var lname = "Johnson";
row.push(lname);

var job = "Game Director";
row.push(job);

// insert the row
myStack.push(row);

Then it would be possible to iterate like this :

for (var i=0;i<myStack.length;i++) {
    var row = myStack[i];
    var fname = row[FIELD_FNAME];
    var lname = row[FIELD_LNAME];
    var job = row[FIELD_JOB];
}

for example:

var varname={};

for (var k = 0; k < result.rows.length; k++) {
   varname[k] = 
   {
     'id': result.rows.item(k).id,
     'name': result.rows.item(k).name
   };
}

You can use three for loops, if you are inserting all of the values into the array at one time:

for (var i = 0; i < 3; i++) {
    for (var j = 0; j < 3; j++) {
        for (var k = 0; k < 3; k++) {
            myStack[i][j][k] = myValue;
        }
    }
}