Look-up tables for fun and profit

Imagine you’re writing your own programming language, and you want to let the user use WebView to display a browser in a window. All the IBAction functions on a web view are of the same form: -(void) methodName: (id)senderwhere the sender is generally ignored. So you can take the strings your programming language gets from the user and use NSSelectorFromString() to get a SEL, (the data type that @selector() returns) and then you can use [myWebView performSelector: theSel withObject: nil] or whatever to actually make the call. That way, you only need to write code for each kind of command, not for each and every command individually.