Javascript array best practice to use [] instead of new array?

Question

I read at many tutorials that the current best practices to create a new javascript array is to use

var arr = [] 

instead of

Answer 1

It's less typing, which in my book always wins :-)

Once I fixed a weird bug on one of our pages. The page wanted to create a list of numeric database keys as a Javascript array. The keys were always large integers (a high bit was always set as an indicator). The original code looked like:

 var ids = new Array(${the.list});

Well, guess what happened when the list had only one value in it?

 var ids = new Array(200010123);

which means, "create an array and initialize it so that there are 200 million empty entries".