Is there a jQuery(&:map) function like in Ruby?

Question

I want to get all ids from a collection of items, how can I make this one short line:

var ids = [];
$(".post").each(function(index, element) {
  ids.push($(element).attr("id"));
});

Something like:

var ids = $(".post").map("id");

Thanks.

Answer 1

Yup! .map() for jQuery objects, or $.map for arrays and objects. The jQuery version will return a jQuery object with the map function applied, so you have to call .get() to get the actual array out of it.

var ids = $(".post").map(function(index, element) { return element.id }).get();