I'm late to the party again. To understand the importance of closures it might be interesting to look at this poster[1]. Look at the node in the top left that

I'm late to the party again. To understand the importance of closures it might be interesting to look at this poster[1]. Look at the node in the top left that says "Functional programming". Every paradigm that descends from that node depends on closures. THAT's how important they are. [1] http://www.info.ucl.ac.be/~pvr/paradigms.html http://www.info.ucl.ac.be/~pvr/paradigms.html