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I’m new to Javascript, and notice that you don’t need to specify an array’s size and often see people dynamically creating arrays one element at time. This would be a huge performance problem in other languages as you would constantly need to reallocate memory for the array as it increases in size.
Is this not a problem in JavaScript? If so, then is there a list structure available?
It most likely depends on what JavaScript engine you use.
Internet Explorer uses a mix of sparse arrays and dense arrays to make that work. Some of the more gory details are explained here: http://blogs.msdn.com/b/jscript/archive/2008/04/08/performance-optimization-of-arrays-part-ii.aspx.