May 17, 2013
Best of the set: .grep() or .map() instead of defaulting to .each() with conditional logic inside. I'm sure there's a blog post out there about the speed of jQuery vs. Underscore's implementations....
Follow-up: JSWeekly #130 points to a comparison of Underscore's .map() and .reduce(), their performance and ECMAScript5's inclusion of them as [].map() and [].reduce().
Also, the non-jQuery tip for >IE8-browsers for document.querySelector('#list') and document.querySelectorAll('#list li') is helpful food-for-thought, too.
Via JSWeekly #129.