Find elements by custom data attribute value

Question

I was wondering if there\'s a way to select an item (div,span,whatever..) using javascript with jQuery (+ jQuery UI lib) based on its data attribute value. For example, let\

Answer 1

var resultingElement = $('.b[data-myKey=1234]');

I'm not sure 100% sure, but I think there was an issue with camel-case selectors in data attributes at some point.