Grep vs Filter in jQuery?
They both function in similar ways however they differ in their usages.
The filter function is intended to be used with html elements, and that is why it is a chainable function that returns a jQuery object and it accepts filters like ":even", ":odd" or ":visible" etc. You can't do that with the grep function, which is intended to be a utility function for arrays.
Filter is part of jQuery.fn so it's aim is to be used with selector $('div').filter where grep is a jQuery tool method (jQuery.grep)