jQuery: Index of element in array where predicate

Question

I have an array of objects. Each object has, among others, an ID attribute. I want to find the index in the array of the object with a specific ID. Is there any elegant and

Answer 1

Not really elegant, but a cute trick:

var index = parseInt(
  $.map(array, function(i, o) { return o.id === target ? i : ''; }).join('')
);

jQuery doesn't have a lot of functional constructs like that; the philosophy of the library is really focused on the job of DOM wrangling. They won't even add a .reduce() function because nobody can think of a reason it'd be useful to the core functionality.

The Underscore.js library has a lot of such facilities, and it "plays nice" with jQuery.