What are Deferred objects and promises in jQuery?

{ "n": 1 }

{ "n": 2 }

<p>Page</p>

$.when($.getJSON('a.json'), $.getJSON('b.json')).done(function (a, b) {
  console.log('Sum: ' + (a[0].n + b[0].n));
});

See Deferred and Promises.

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