If your function is simple enough, it pays to define it inline. It's the same with array literals and dictionary literals. What would you rather? somefn( {

If your function is simple enough, it pays to define it inline. It's the same with array literals and dictionary literals. What would you rather? somefn( {a: 10, b : 20} ) or: dict = new Dictionary() dict[a] = 10 dict[b] = 20 somefn(dict) The inline case is clearly a win.