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Arrays and Objects

$.merge(Array first, Array second)<br>Merge the contents of two arrays into 'first'.<br>$.extend([Boolean deep,] Object target [, Object o]...)<br>Extend the contents of 'target' with the contents of subsequent Object arguments.<br>$.fn.extend(Object o)<br>Extend the jQuery prototype.
RESETRUNFULL
<!DOCTYPE html><html><head>
   <script src="jquery-3.5.1.min.js"></script></head><body>
   <p class='c2'></p>
   <p class='c3'></p>
   <p class='c3'></p>
   <p class='c1'></p>
   <script>
   arr = $('p').get();
   arr = arr.concat(arr);
   alert(arr.length);  // 8
   $.uniqueSort(arr);
   alert(arr.length);  // 4
      $.fn.extend({hello:
                function(){alert('hello');}});
   $('p').hello();  // hello
   </script></body></html>