Closures in a for loop

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See the bind method.

$('#button'+i).bind('click', {button: i}, function(event) {
  foo(event.data.button);
});

From the docs:

The optional eventData parameter is
not commonly used. When provided, this
argument allows us to pass additional
information to the handler. One handy
use of this parameter is to work
around issues caused by closures

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