Question

This is a really stupid question, but I’m just drawing a blank here…

What type of variable declaration is this:

var s1 = [1,2,3,4]

Also, How can I construct a variable like this from multiple objects when the amount of those objects is unknown. This is what I came up with, which doesn’t work.

var s1 = [];
for(x in data[i].uh) {
    s1 += data[i].uh[x];
}

Answer 1

var s1 = [1,2,3,4]

is an array declaration of four integers using “Array Literal Notation”

You don’t need a loop to copy the array, simply do this:

var s1 = data.slice(0);

or in your example you might want this:

var s1 = data[i].uh.slice(0);

Read more about copying arrays here: http://my.opera.com/GreyWyvern/blog/show.dml/1725165

“The slice(0) method means, return a
slice of the array from element 0 to
the end. In other words, the entire
array. Voila, a copy of the array.”