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
 }
 ]

• SLaks: Your syntax makes no sense. What are you trying to do?
• Amadan: 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.
• Felix Kling: mystack is not an array, it's an object.

Answer 1

use push

eg:

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

Answer 2

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 };
 }
}

• Felix Kling: Don't add non-numerical properties to arrays. Use an object instead.
• Mustapha George: Right track JN! I was mixing up arrays and objects. I think I want myStack[recordNo]["Source1"] = { "lat": 123, "lon": 456 }
• Felix Kling: 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: starting to catch on. I wll give it a try,,,