w3resource
JavaScript Exercises

JavaScript: Extract unique characters from a string

JavaScript Function: Exercise-16 with Solution

Write a JavaScript function to extract unique characters from a string.

Example string : "thequickbrownfoxjumpsoverthelazydog"
Expected Output : "thequickbrownfxjmpsvlazydg"

Sample Solution: -

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Extract unique character from a string - w3resource</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function unique_char(str1)
{
 var str=str1;
 var uniql="";
 for (var x=0;x < str.length;x++)
 {

 if(uniql.indexOf(str.charAt(x))==-1)
  {
  uniql += str[x];  
  
   }
  }
  return uniql;  
}  
console.log(unique_char("thequickbrownfoxjumpsoverthelazydog"));

Sample Output:

thequickbrownfxjmpsvlazydg

Flowchart:

Flowchart: JavaScript function: Extract unique characters from a strin

Live Demo:

See the Pen JavaScript - Extract unique characters from a string-function-ex- 16 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript function to compute the value of bn where n is the exponent and b is the bases.
Next: Write a JavaScript function to get the number of occurrences of each letter in specified string.

What is the difficulty level of this exercise?