Question

How to remove duplicate elements from an array in JavaScript

Answer 1

arr = ['x', 1, 'y', 1, '3', 'x', '1'];
 
var uarr = arr.filter(function(value, index, self) { 
  return self.indexOf(value) === index;
});

document.write(uarr);

/*
run:
  
x,1,y,3,1
  
*/

 

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Answer 2

arr = ['x', 1, 'y', 1, '3', 'x', '1', 1, 1];
 
var arr = arr.filter(function(value, index, self) { 
  return self.indexOf(value) === index;
});

document.write(arr);

/*
run:
  
x,1,y,3,1
  
*/

 

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