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Sep 19th, 2017
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  1. var arr = new Array();
  2. arr.push(1,2,3);
  3. arr.reverse();
  4. alert(arr); // 3,2,1
  5.  
  6. var arr = new Array();
  7. arr.push("Hi");
  8. new_arr = arr.concat("again!");
  9. alert(arr); // "Hi"
  10. alert(new_arr); // "Hi","again!"
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