javascript array - adding entries

Question

In javascript array called mystack, for each recordNo, I want to set up a set of lat/lon values for entities "Source1" and "Source2", but I am having trouble getting the syntax just right. recordNo is a numeric database record id (eg: 1,2,3)

    mystack = {};

    mystack[recordNo {"Source1" } ] = 
    [
        {   
            "lat": 123,
            "lon": 456
        }
    ]


    mystack[recordNo {"Source2" } ] = 
    [
        {   
            "lat": 123,
            "lon": 456
        }
    ]

You can never say recordNo {"Source1" } in JavaScript. However, since you didn't say what you want, we can't tell what you should do instead. — Amadan
– Amadan, Commented Dec 25, 2011 at 19:09

xkeshav · Accepted Answer · 2011-12-25 19:09:25Z

5

use push

eg:

   var sports = ["soccer", "baseball"];
   sports.push("football", "swimming");

answered Dec 25, 2011 at 19:09

xkeshav

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Comments

Jon Newmuis · Accepted Answer · 2011-12-25 19:18:22Z

1

I was mixing up arrays and objects. I think I want myStack[recordNo]["Source1"] = { "lat": 123, "lon": 456 };

If this is the case, then you can do the following:

var myStack = [];
var recordNumbers = [1, 2, 3, 4];          // list of record numbers
for (var recordNo in recordNumbers) {
    myStack[recordNo] = {};
    var sources = ["Source1", "Source2"];  // list of sources

    for (var source in sources) {
        myStack[recordNo][source] = { "lat": 123, "lon": 456 };
    }
}

edited Dec 25, 2011 at 19:18

answered Dec 25, 2011 at 19:10

Jon Newmuis

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4 Comments

Felix Kling Over a year ago

Don't add non-numerical properties to arrays. Use an object instead.

Mustapha George Over a year ago

Right track JN! I was mixing up arrays and objects. I think I want myStack[recordNo]["Source1"] = { "lat": 123, "lon": 456 };

Felix Kling Over a year ago

There are still two flaws in your code: Don't use for...in to iterate over array entries, you might be traversing other properties as well. And the nature of recordNumbers somehow suggests to use an object for myStack, not an array.

Mustapha George Over a year ago

starting to catch on. I wll give it a try,,,

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